Alcatel-Lucent OMNIACCESS 601, OMNIACCESS 602, OMNIACCESS 604 Routing User Guide

Router User
Guide

June 2005

Alcatel  Alcatel Internetworking 26801 West Agoura Road Calabasas, CA 91301

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Copyright

Copyright © Alcatel, 2003-2005. All rights reserved. No part of this documentation may be reproduced in any form or by any means without
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Alcatel and the Alcatel corporate logo are trademarks of Alcatel All other trademarks appearing in this guide are the exclusive property of their
respective owners.

Software Notice

Alcatel assumes no responsibility for product reliability, performance, or both if the user modifies the .CFG file. Full responsibility for any
performance issues resulting from modifications made to the .CFG file, by the user, is assumed by the user.

Hardware Notice

The Lithium battery on the motherboard of this product is a non-volatile device that will retain data over 10 years in the absence of power.

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June 2005

C

ONTENTS

Copyright .........................................................................................................................................................................................ii

Trademarks ......................................................................................................................................................................................ii

Software Notice ...............................................................................................................................................................................ii

Hardware Notice ..............................................................................................................................................................................ii

Documentation Feedback ................................................................................................................................................................ii

ABOUT THIS GUIDE ...................................................................................................................................1

Organization..................................................................................................................................................................................... 1

Documentation.................................................................................................................................................................................1

PROTOCOLS OVERVIEW ............................................................................................................................3

BGP4................................................................................................................................................................................................3

OSPF................................................................................................................................................................................................ 4

RIP ................................................................................................................................................................................................... 5

Multicasting .....................................................................................................................................................................................6

Securing Remote Access Using IPSec VPN....................................................................................................................................6

COMMAND LINE INTERFACE.....................................................................................................................7

Command Types .............................................................................................................................................................................. 7

Command Conventions....................................................................................................................................................................8

CLI Navigation ................................................................................................................................................................................9

Command Help .............................................................................................................................................................................. 10

POLICY COMMANDS ................................................................................................................................15

GENERIC ROUTING COMMANDS .............................................................................................................37

BGP4 CLEAR COMMANDS ......................................................................................................................43

BGP4 CONFIGURE COMMANDS ..............................................................................................................49

BGP4 SHOW COMMANDS ........................................................................................................................87

AS PATH REGULAR EXPRESSIONS ........................................................................................................105

Matching AS Paths ......................................................................................................................................................................105

Router User Guide

AS Path Regular Expressions (regex) .......................................................................................................................................... 105

AS Path Terms .............................................................................................................................................................................106

OSPF CONFIGURE COMMANDS............................................................................................................107

OSPF SHOW COMMANDS ..................................................................................................................... 149

RIP CONFIGURE COMMANDS ...............................................................................................................183

RIP SHOW COMMANDS .........................................................................................................................207

MULTICASTING ...................................................................................................................................... 217

Multicasting Overview ................................................................................................................................................................217

Protocol Independent Multicast - Source Specific Multicast (PIM-SSM) .................................................................................. 220

Internet Group Management Protocol (IGMP)............................................................................................................................ 220

Traceroute Facility for IP Multicast.............................................................................................................................................222

Multicast Multipath...................................................................................................................................................................... 222

Multipath Commands ..................................................................................................................................................................223

Generic Routing Encapsulation (GRE)........................................................................................................................................ 223

INDEX:

ENERAL................................................................................................................................................225

G

INDEX: GENERIC COMMANDS ..............................................................................................................227

INDEX: POLICY COMMANDS ................................................................................................................. 229

INDEX: OSPF COMMANDS.................................................................................................................... 231

INDEX: BGP COMMANDS...................................................................................................................... 233

INDEX: RIP COMMANDS ....................................................................................................................... 235

CORPORATE POLICY ............................................................................................................................. 237

Standard Warranty ....................................................................................................................................................................... 237

Equipment Malfunction ...............................................................................................................................................................238

Contacting Alcatel .......................................................................................................................................................................238

T

ABLES

1 Guide Organization: Major Sections ................................................................................................................................ 1

2 BGP RFC Compliance ..................................................................................................................................................... 4

3 OSPF RFC Compliance ....................................................................................................................................................5

4 RIP RFC Compliance ....................................................................................................................................................... 5

5 Context-Sensitive Command Sequence ........................................................................................................................... 7

6 Syntax Conventions .......................................................................................................................................................... 8

7 Example Conventions ....................................................................................................................................................... 8

8 Parameter Definitions .......................................................................................................................................................40

9 Default Route Preference (Administrative Distance) Values ...........................................................................................55

10 Status and Origin Codes ................................................................................................................................................... 91

11 Status and Origin Codes ................................................................................................................................................... 94

12 Other BGP show Descriptions ..........................................................................................................................................94

13 Interpreting BGP Paths ..................................................................................................................................................... 95

14 Status and Origin Codes ................................................................................................................................................... 95

15 Header Definitions ............................................................................................................................................................ 97

16 Status and Origin Codes ................................................................................................................................................... 98

17 Default Route Preference (Administrative Distance) Values ...........................................................................................127

18 Default Route Preference (Administrative Distance) Values ...........................................................................................128

19 Default Route Preference (Administrative Distance) Values ...........................................................................................186

Router User Guide

F

IGURES

1 Navigation Keys ............................................................................................................................................................ 10

2 Help Screen ................................................................................................................................................................... 10

3 Alcatel CLI Command Tree .......................................................................................................................................... 11

4 ? Help Screen................................................................................................................................................................. 12

5 Global Show Command ................................................................................................................................................ 13

Router User Guide

Organization

A

BOUT

This guide describes Alcatel’s implementation and command usage of BGP4, OSPF, RIP, and
multicast routing protocols. It is designed for network managers and administrators who are
responsible for the operation of LAN and WAN equipment and are familiar with networks and
routing protocols.

The following table describes the organization and content of this guide.

T

HIS

G

UIDE

1

Documentation

Table 1 Guide Organization: Major Sections

About This Guide Defines the user audience, describes the document’s organization, introduces special notices,

Protocols Overview Provides high-level information about the routing protocols supported by Alcatel.

Command Line
Interface

Commands Describes the individual CLI commands. Commands are organized by protocol and are in

The following list includes other available and related documentation.

 Release Notes

Printed release notes provide the latest information. If release notes are provided with your
product, follow the instructions contained within them in addition to those provided in other
documentation.

 Quick Start Guides

These guides are designed for advanced users who need minimal installation, configuration, and
operation information.

 Installation Guides

These detailed guides are designed for network managers and technicians who are responsible
for the installation of networking equipment in Telco and service provider network
environments.

and provides information about other Alcatel user guides.

Describes the command line interface (CLI) and how to access navigation and help features.
A review of Alcatel configuration standards is included.

alphabetical order. Each entry provides a command description and syntax and usage
examples.

 Command Reference Guide

This detailed guide provides a complete alphabetical listing of all non-routing commands
including descriptions, syntax, examples, and applicable systems.

Router User Guide

2 Chapter : About This Guide

 Configuration Guide

This guide provides examples of how features are used.

Guides and release notes are available in PDF format on the

Alcatel website: www.alcatel.com.

To view PDF files, Adobe Acrobat® Reader® 4.0 (or later) must be installed on your PC. If you do
not have the Adobe Acrobat Reader installed on your system, you can obtain it free from the Adobe
website:

www.adobe.com.

Router User Guide

BGP4

P

ROTOCOLS

Border Gateway Protocol Version 4 (also referred to as simply BGP) is an exterior routing protocol
used for the global Internet.

Once configured, BGP peers first exchange complete copies of their routing tables (including BGP
version, router ID, and keep alive hold time), which are usually very large. Thereafter, only
incremental updates (deltas) are sent as changes occur to the routing tables. BGP keeps a current
version of the routing table for all peers, keep alive packets are sent to ensure that the connection
between BGP peers, and notification packets are sent in response to problems and irregularities. This
enables longer running BGP sessions to be more efficient than shorter sessions.

BGP's basic unit of routing information is the BGP path, a route to a certain set of classless
interdomain routing prefixes. Paths are tagged with various path attributes, including an autonomous
systems (AS) path and next-hop. In fact, one of BGP's most important functions is loop detection at
the AS level, using the AS path attribute, which is a list of autonomous systems used for data
transport.

The syntax of this attribute is made more complex by its need to support path aggregation when
multiple paths are collapsed into one in order to simplify further route advertisements. A more
simplified view of an AS path is that it is a list of autonomous systems that a route goes through to
reach its destination. Loops are detected and avoided by checking for your own AS number in the AS
path's received from neighboring autonomous systems. Every time a BGP path advertisement
crosses an AS boundary, the next-hop attribute is changed on the boundary router. Conversely, as a
BGP path advertisement is passed among BGP speakers in the same AS, the next-hop attribute is left
untouched. Consequently, BGP's next-hop is always the IP address of the first router in the next
autonomous system, even though this may actually be several hops away. The AS's interior routing
protocol is responsible for computing an interior route to reach the BGP next-hop.

This leads to the distinction between internal BGP (IBGP) sessions (between routers in the same AS)
and external BGP (EBGP) sessions (between routers in different AS's). Next-hops are only changed
across EBGP sessions, but left intact across IBGP sessions. The two most important consequences of
this design are the need for interior routing protocols to reach one hop beyond the AS boundary, and
for BGP sessions to be fully meshed within an AS.

Since the next-hop contains the IP address of a router interface in the next AS, and this IP address is
used to perform routing, the interior routing protocol must be able to route to this address. This
means that interior routing tables must include entries one hop beyond the AS boundary.
Furthermore, since BGP does not relay routing traffic from one interior BGP session to another (only
from an exterior BGP session to an IBGP session or another EBGP session), BGP speakers must be
fully meshed.

O

VERVIEW

3

RFC Compliance The following table provides Alcatel’s BGP RFC compliance information.

Router User Guide

4 Chapter : Protocols Overview

OSPF

Table 2 BGP RFC Compliance

RFC Description

2385 Protection of BGP sessions via the TCP MD5 signature option

1998 An application of the BGP community attribute in multi-home routing

1997 BGP communities attribute

1775 BGP OSPF interaction

1771 Border Gateway Protocol 4 (BGP-4)

Open Shortest Path First (OSPF), a link-state routing protocol, is used for routing IP packets. OSPF
offers the following advantages:

 Scalability

OSPF is designed to operate with larger networks. It does not impose a hop-count restriction and
permits its domain to be split into areas for easier management.

 Full subnetting support

OSPF can fully support subnetting, including Variable Length Subnet Mask (VLSM).

 Tagged routes

Routes can be tagged with arbitrary values. This eases interoperation with Exterior Gateway
Protocols

 Meshed networks

(EGPs), which can tag OSPF routes with AS numbers.

OSPF provides the ability to support complex meshed networks.

The following features are incorporated in

 Intra- and inter-area routing

 Broadcast and point-to-poPnt

 Type 1 & Type 2 AS external routes

 Stub areas

 NSSA – Not-So-Stubby-Area

 Route re-distribution

 Authentication – simple & MD5

 RFC 1583 backwards compatibility

 Equal cost multipath

 Configurable routing interface parameters

 Non-intrusive reconfiguration

Alcatel’ implementation of OSPF.

Router User Guide

Chapter : Protocols Overview 5

RFC Compliance The following table provides Alcatel’s OSPF RFC compliance information.

Table 3 OSPF RFC Compliance

RFC Description

2328 OSPF version 2

1587 OSPF NSSA option

1850 OSPF Version 2 Management Information Base

RIP

Routing Information Protocol (RIP) is an interior gateway protocol (IGP), i.e., it routes traffic within
a single autonomous system (AS). RIP uses a distance-vector algorithm with hop count as the metric
to determine the best route to a destination.

Update messages are sent at configured intervals and when changes occur in the network topology.
These messages are used by routers to update their routing tables to maintain currency with the state
of the network. When a router updates its routing table, it transmits update messages to other routers
in the network to enable them to update their routing tables.

The following list identifies architectural characteristics of RIP:

 The network path is limited to 15 hops. A destination with a greater number of hops is

considered unreachable.

 The time required to determine a next hop and bandwidth could be substantial in a large network.

 A fixed metric is used to select routes. Only the best route with the lowest metric is maintained

for a specific destination.

The following features are incorporated into

 RIP v1, v2, and v1 compatibility modes

 Configurable timers

 VLSM

 Split-horizon and split-horizon with poison reverse

 Clear text and MD5 authentication

 Redistribution of connected, static, and OSPF routes

 Inbound and outbound filtering policies

Alcatel’ implementation of RIP:

RFC Compliance The following table provides Alcatel’s RIP RFC compliance information.

Table 4 RIP RFC Compliance

RFC Description

1058 Routing Information Protocol

2453/STD0056 RIP Version 2

1724 RIP Version 2 MIB extension

2082 RIP-II MD5 Authentication

Router User Guide

Multicasting

Traditional multicast routing mechanisms such as Distance Vector Multicast Routing Protocol
(DVMRP) and Multicast Open Shortest Path First (MOSPF) were intended for use within regions
where groups are densely populated or bandwidth is universally plentiful. When groups, and senders
to these groups, are distributed sparsely across a wide area, these “dense mode” schemes do not
perform efficiently.

Protocol Independent

Multicast (PIM)

Protocol Independent Multicast (PIM) protocols route multicast packets to multicast groups. PIM is
protocol independent because it can leverage whichever unicast routing protocol is used to populate
unicast routing table. There are two modes of PIM protocol – Dense mode (DM) and Sparse mode
(SM). Alcatel supports SM only in version 8.0 and higher.

PIM-DM floods multicast traffic throughout the network initially and then generates prune messages
as required. PIM-SM attempts to send multicast data only to networks which have active receivers.
This is achieved by having a common Rendezvous Point (RP) known to the senders and receivers
and by forming shared trees from the RP to the receivers.

PIM-SM is described in RFC 2362.

Securing Remote Access Using IPSec VPN

The features in version 8.0 and higher allow administrators to form a security tunnel to join two
private networks over the Internet. The following examples show how to set up an end-to-end tunnel
with a single proposal and pre-shared key authentication, with multiple proposals and pre-shared key
authentication, and with an SA Bundle, and pre-shared key authentication.

The corporate network no longer has a clearly defined perimeter inside secure building and locked
equipment closets. Increasingly, companies have a need to provide remote access to their corporate
resources for the employees on the move.

Traditionally, remote users could access the corporate LAN through dial-up and ISDN lines which
were terminated in the corporate remote access servers. However, these point-to-point connection
technologies do not scale well to the growing number of remote users and the corresponding increase
in the infrastructure investments and maintenance costs.

A solution to meeting the needs of increasing numbers of remote users and for controlling access
costs is to provide remote access through the Internet using firewalls and a Virtual Private Network
(VPN). Internet Protocol Security (IPSec) keeps the connection safe from unauthorized users.

In a typical IPSec remote access scenario, the mobile user has connectivity to Internet and an IPSec
VPN client loaded on their PC. The remote user connects to the Internet through their Internet
service provider and then initiates a VPN connection to the IPSec security gateway (the VPN server)
of the corporate office, which is typically an always-on Internet connection.

One of the main limitations in providing remote access is the typical remote user connects with a
dynamically assigned IP address provided by the ISP. IPSec uses the IP address of users as an index
to apply the Internet Key Exchange (IKE) and IPSec policies to be used for negotiation with each
peer. When the VPN client has a dynamic IP address, the VPN server cannot access the policies
based on the IP address of the client. Instead, the VPN server uses the identity of the VPN client to
access the policies.

Command Types

C

OMMAND

This chapter introduces the Command Line Interface (CLI) hierarchy and the conventions used to
describe it. It also introduces the CLI navigation keys and methods, as well as the available help
screens.

This guide contains two types of commands: transition, or mode change, commands and standard
commands.

Transition commands do not affect the system configuration, they are used to gain access to lower­or next-level commands in the CLI hierarchy. Following each transition command is a brief
description, a syntax and usage example, a list of next-level commands, and a list of systems for
which the command is applicable.

L

INE INTERFACE

7

Context-Sensitive

Commands

NOTE: In certain instances, transition commands will select an interface for configuration and access

next-level commands. For example, the configure interface bundle dallas command accesses the
configure interface bundle mode and selects or creates the bundle dallas.

Standard commands are used to configure the system. Following each standard command is a brief
description, a list of parameters and definitions, a syntax and usage example, a list of related
commands, and a list of systems for which the command is applicable.

Some commands are context-sensitive. Once a module, bundle, or Ethernet port has been selected for
configuration, all further configuration applies only to the selected interface. Table 5 shows a
context-sensitive command string for a host system. In this example, T1 link 1 remains selected for
configuration until you exit from the

Table 5 Context-Sensitive Command Sequence

Context-Sensitive Command String Example

1 Go into the configuration mode. Alcatel-host> configure terminal

2 Specify the type of interface (T1).

3 Choose the specific interface (T1 link 1).

4 From now on, all configuration commands are for T1

link 1 until you exit from module configuration or
choose another T1 link.

NOTE: Command strings that require identification of a specific interface are context-sensitive.

Alcatel-host/configure/module/t1> prompt.

host/configure> module t1

Alcatel-

Alcatel-host/configure> module t1 1

Alcatel-host/configure/module/t1 1>

Router User Guide

8 Chapter : Command Line Interface

Command Conventions

Each command is briefly described and then followed by the complete syntax, which is essentially a
map of the command that shows mandatory and optional parameters.

The following tables provide details of the conventions used for syntaxes and examples.

Table 6 Syntax Conventions

For Syntaxes What it means

normal type

[ a | b | c ]

< >

[ ]

Within syntaxes, “normal type” represents required words that must be
entered by the user — except when followed by a parameter setting that is
enclosed in angled brackets. In that case, only enter the parameter setting
enclosed in the angled brackets.

Example 1: Normal type only.

In this example, the user enters the word or argument (module) appearing in
the syntax in “normal type.”

Syntax:

module

Command execution:

module

Example 2: Normal type word or argument that is followed by a second
normal type word or argument, which is followed by a parameter setting
enclosed in angled brackets.

In this example, the user enters the first word or argument “connections,”
appearing in normal type, and then only enters the value “4” of the second
word or argument.

Syntax:

connections connections < n >

Command execution:

connections 4

In other words, the first occurence of “connections” must be entered because
it is not followed by a setting enclosed in angled brackets. The second
occurence of the word “connections” must NOT be entered because it is
followed by a setting enclosed in angled brackets. This value of the setting
must be entered to execute the command.

Normal brackets “[ ]” indicate optional keywords or arguments.

A vertical bar “ | “ separates individual settings.

Example:

In this example, the user enters the word “timeout;” must specify either for
“tcp” or “udp” for a protocol type; and optionally enters a timeout value “n.”

Syntax:

timeout protocol_type < tcp | udp > [ seconds < n > ]

Command execution:

timeout udp 3600

Angled brackets. All parameter settings are enclosed in angled brackets. The
user is directed to choose an appropriate setting. In some cases, the parameter
name accompanies the required setting.

Optional parameter settings in each syntax are indicated by normal brackets.

Router User Guide

Table 7 Example Conventions

For Examples What it means

Chapter : Command Line Interface 9

Abbreviated

Commands

normal type

bold type

Prompts and commands that are part of the main prompt are shown in normal
type.

Examples:

Alcatel-host>

Alcatel-host/show>

All character strings that a user must enter to execute a command are in bold
type.

Example:

Alcatel-host> configure term

You may enter commands by typing the first few characters of each word in a command string. The

Alcatel system recognizes the unique abbreviated entry and executes the command exactly as if you

had entered it fully.

For example, to view the currently running system configuration, you may type show configuration
running at the prompt. You may also type dis con run to get the same result. Similarly, you may
abbreviate the optional parameter names required by some commands.

For example, a typical entry may be as follows:

mlppp mrru 1600 sequence short seg_threshold 1000 differential_delay 100 discriminator

10.1.100.22

To save time, you may type the following equivalent abbreviated string:

mlppp m 1600 seq short seg 1000 diff 100 dis 10.1.100.22

CLI Navigation

The Ta b, Esc, and Ctrl keyboard keys may be used to:

n Move backwards or forwards in the CLI

n Edit entered command strings

n Or accelerate the command entry process

Navigation Keys You may use the Tab key to quickly enter each word of a command without typing its full name. For

example, to enter the configure command, you may type its first two letters and then press Ta b to
complete the entire word. Then, you may specify an item to configure by pressing the Spacebar and
then pressing Ta b repeatedly until the desired sub-command appears. Repeat this sequence for each
successive sub-command string until the entire command string appears.

You may also use the other keystrokes shown in Figure 1 during command entry. For example, to
back up the cursor without deleting any characters, type Ctrl-B. To repeat the last command that you
entered, type Ctrl-P. To go back several commands, type Ctrl-P repeatedly until the desired
previous command appears. Or, you may go directly back to the main CLI> prompt from anywhere
in the command hierarchy by typing Ctrl-Z.

Router User Guide

10 Chapter : Command Line Interface

Figure 1 Navigation Keys

> help edit
key stroke -- action

---------- -- -----­ TAB -- command completion
Esc-B -- go back one word
Esc-F -- forward one word
Esc-DEL -- delete one word left to cursor
BackSpace -- go back and delete one char
Ctrl-A -- start of line
Ctrl-B / <- -- go back one char
Ctrl-D / DEL -- delete a char

-- go up one level if empty command
Ctrl-E -- end of line
Ctrl-F / -> -- forward one char
Ctrl-K -- delete line ahead of cursor
Ctrl-L -- refresh line
Ctrl-N / DN ARROW -- next command in history
Ctrl-P / UP ARROW -- previous command in history
Ctrl-U -- delete entire line
Ctrl-W -- delete one word left to cursor
>

Command Help

Command help is available for navigating the CLI command hierarchy and for assistance with
specific commands. You may obtain help by using any of the three commands described below.

Help Type help at the main CLI prompt to see the basic Alcatel system help information. Or, type help

followed by a command name to view information about that command. Figure 2 shows the help
screen.

Figure 2 Help Screen

> help
? -- display commands under this tree
exit [level] -- exit (level nos ) from the current tree

-- 'exit' from "top level" terminates CLI
Ctrl-Z -- exit to top level
tree -- display tree under current node
type 'help edit' to see editing features
type 'help <cmd>' to get help for that command
>

Tree You may view a tree that shows all CLI commands, or a tree that shows only the commands

associated with the current command mode (or the routing mode for example). Figure 3 shows two
command tree examples. If you type tree at the main (
list of system commands appears. If you type tree within a command mode, such as

Alcatel-6000/clear> tree, the commands associated with this command mode are displayed.

Alcatel-host> or equivalent) prompt, the entire

Router User Guide

Chapter : Command Line Interface 11

Figure 3 Alcatel CLI Command Tree

> tree
xcli
|-- ping
|-- clear
| |-- cfg_file
| |-- arp
| |-- cfg_log
| |-- command_log
| |-- snmp_stats
| |-- counters
| | |-- all
| | |-- ethernet
| | |-- ethernets
| | |-- bundle
| | |-- bundles
| | |-- avc
| | |-- avcs
| | |-- tunnel
| | |-- tunnels
| |-- interface
| | |-- all
| | |-- ethernet
Press any key to continue (q : quit) :

Question Mark Help

Screen

To view help information for a command category, specific command, or a parameter, type the
associated word followed by a space and a question mark (?). For example, if you type a question
mark at the main command prompt, the system command categories appear. Figure 4 shows a
display of these top-level commands.

Router User Guide

12 Chapter : Command Line Interface

Figure 4 ? Help Screen

> ?

NAME
xcli -- This is root and not a command

SYNTAX
COMMANDS <cr>

DESCRIPTION
COMMANDS -- Any of the following commands can be used

clear -- access clear commands
configure -- configure from ( flash / network / terminal )
debug -- accesses debug commands
dir -- directory of files in flash
erase -- access erase filesystem commands
file -- access file commands
password -- Change the user password
ping -- invoke ping
reboot -- reboot the system
reload -- reboot the system
save -- save configuration to ( local / network )
show -- access show commands
tclsh -- To invoke TCL shell
telnet -- open a telnet connection
test -- access test commands
trace -- trace route to destination address or host name
write -- write to terminal/network/flash

>

The default parameters for specific commands appear in parenthesis.

NOTE:

Global Commands All show, ping, and save commands are available from any level of the CLI. For example, the global

show commands allow the user to view current configuration settings, alarms, or tests without

exiting the configure mode. In (Figure 5), a user has displayed a bundle summary while configuring
a new bundle.

Similarly, the ping and save commands are available at any level of the CLI command. The ping
command verifies connectivity between the
save commands from anywhere in the CLI ensures that your configurations may be saved
periodically.

Alcatel system and other network hosts; access to the

Router User Guide

Chapter : Command Line Interface 13

Figure 5 Global Show Command

> show configuration
: Select type of 'configuration' ( Hit Tab )
> dir

CONTENTS OF /flash1:

size date time name

-------- ------ ------ -------­ 6467513 FEB-04-2004 13:51:22 T1000.1223.Z
6771268 APR-01-2004 11:38:42 T1000.Z
1908 APR-01-2004 11:56:18 system.cfg
0 FEB-05-2004 07:12:30 oldsystem.cfg
6500329 APR-01-2004 11:49:22 T1000.020404.Z

Total bytes: 19741018
Bytes Free: 12713984
>

NOTE:

The tab completion feature is not currently available for global commands.

Router User Guide

14 Chapter : Command Line Interface

Router User Guide

P

OLICY

This chapter provides information about routing policy commands that are supported by Alcatel.

C

OMMANDS

15

Router User Guide

16 Chapter : Policy Commands

configure policy

This command provides access to the next-level commands.

next-level commands

configure policy as_path

configure policy community_list

configure policy ip_access_list

configure policy route_map

Router User Guide

Chapter : Policy Commands 17

configure policy as_path

This command configures the autonomous system path filter for BGP.

AS path access lists are used for matching the AS path attribute in a BGP route. An AS path access
list succeeds if any “permit” line in the list matches, or fails if any “deny” line matches. Matching
proceeds sequentially and stops at the first match.

The regular expression parameter is an as path regular expression. (For regular expression syntax,
see “AS Path Regular Expressions” on page 105.) Note that the regular expression must be enclosed
in quotation marks. The AS number is the smallest element of a
integer ranging from 0 to 65536; the

Alcatel regular expression matcher is AS number-based.

Any number of AS path access list lines may be declared. They are evaluated in the order declared. If
neither permit nor deny is specified, the default is “permit.”

parameter definition

access_list Access list number

Range is 1 - 199.

number Sequence to insert or delete from an existing AS path entry.

Range is 0 - 65535.

action

deny

permit

regular_expression Regular expression to match the AS paths.

Deny AS path.

Permit AS path.

Enter a quoted string.

Refer to AS Path Regular Expressions on page 105 for more information about regular
expressions.

Alcatel regular expression. It is an

syntax:

[ no ] policy as_path access_list < n > number < n > action < deny | permit > regular_expression <
“string” >

example:

Alcatel-host/configure> policy as_path 1 120 permit “100”

example:

Alcatel-host/configure> policy as_path 1 121 deny “.* 101 .*”

applicable systems:

All models.

Router User Guide

18 Chapter : Policy Commands

configure policy community_list

This command accesses next-level commands for adding extended or standard community lists.

Community lists are used for matching the “community” attribute in a BGP route. A community list
succeeds if any “permit” line in the list matches, or fails if any “deny” line matches. Matching
proceeds sequentially and stops at the first match. A line in a community list is normally said to
match if the route being tested contains at least all of the communities listed in the line. That is, it
may contain additional communities as well. If the exact-match keyword is used, then it must
contai8n exactly the same communities as listed.

The communities parameter can be:

 local_as

 no_advertise

 no_export

 aa_nn (an integer between 0 and 65,535)

 community (an integer between 1 and 4294967295

Note that “exact_match” is supported in the community_list as well as at the route_map level. If
neither permit nor deny is specified, the default is permit. If no community is specified, any route
will be matched, regardless of what communities are present. The route will even be matched if the
community path attribute is not present. Any number of community list lines may be declared. They
are evaluated in the order declared.

next-level commands

configure policy community_list extended_community

configure policy community_list standard_community

Router User Guide

Chapter : Policy Commands 19

configure policy community_list extended_community

This command configures an extended community list as part of the policy.

parameter definition

community_list Extended community list number

The range is 100 - 199.

community_index Community index number

The range is 0 - 65535.

action

deny

permit

community A list of community numbers

generate_local_as

local_as

aa_nn Community number in aa_nn format

generate_no_advertise

no_advertise

generate_no_export

no_export

Specify a community to reject.

Specify a community to permit.

The range is 1 - 4294967295.

This list can contain a maximum of 32 numbers.

Do not send out local AS.

This list can contain a maximum of 32 numbers.

Do not advertise to any neighbor.

Do not send to next AS

syntax:

[ no ] policy community_list extended_community community_list < n > community_index < n >
action < deny | permit > [ community < n > ] [ generate _local_as < local_as > ]
[ aa_nn < n > ] [ generate_no_advertise < no_advertise > ] [ generate_no_export < no_export > ]

example:

Alcatel-host/configure> policy community_list extended_community 100 1 deny community 44 45

local_as aa_nn 400:500 no_advertise

applicable systems:

All models.

Router User Guide

20 Chapter : Policy Commands

configure policy community_list standard_community

This command configures a standard community list as part of the routing policy.

parameter definition

community_list Extended community list number

The range is 100 - 199.

community_index Community index number

The range is 0 - 65535.

action

deny

permit

community A list of community numbers

generate_local_as

local_as

aa_nn Community number in aa_nn format

generate_no_advertise

no_advertise

generate_no_export

no_export

Specify a community to reject.

Specify a community to permit.

The range is 1 - 4294967295.

This list can contain a maximum of 32 numbers.

Do not send out local AS.

This list can contain a maximum of 32 numbers.

Do not advertise to any neighbor.

Do not send to next AS

Router User Guide

syntax:

[ no ] policy community_list standard_community community_list < n > community_index < n >
action < deny | permit > [ community < n > ] [ generate_local_as < local_as > ]
[ aa_nn < n > ] [ generate_no_advertise <no_advertise > ] [ generate_no_export
< no_export > ]

example:

Alcatel-host/configure> policy community_list standard_community 90 150 permit community

40 45 local_as aa_nn 655:232592 no_advertise

example:

Alcatel-host/configure/policy> community_list standard_community 90 150 permit community

42949672 no_advertise

applicable systems:

All models.

Chapter : Policy Commands 21

configure policy ip_access_list

This command configures the IP access list for routes.

Ip access lists are used for matching any type of route prefix. An IP access list is said to succeed if
any “permit” line in the list matches, or fails, if any “deny” line matches. Matching proceeds
sequentially and stops at the first match. A line in an IP access list is said to match according to the
rules listed below.

 network netmask

Matches addresses as follows: The bits in the address part of the route being masked that are not
covered by “one” bits in net mask must be equal to the corresponding bits in networkt. The “one”
bits in net mask are sometimes referred to as “don’t care” bits, because the policy engine does not
care what their values are.

 network netmask mask maskmask

Matches addresses as follows: The first pair of parameters (network, maskmask) match the
address part of the route just as in the previous (network netmask) form. The second pair of
parameters (mask, jaskmask) are used to match against the mask part of the route being matched
in a similar fashion. That is, the route is matched if the address part matches and the bits in the
mask that are not covered by “one” bits in net mask are equal to the corresponding bits in mask.

If neither permit nor deny is specified, the default is permit. All kinds of access_list entries may be
mixed freely within a list, and there are no restrictions on what the access_list number may be. Any
number of IP access list lines may be declared. They are evaluated in the order declared.

parameter definition

access_list Access list number

The range is 1 - 99

number Sequence to insert to or delete from an existing access list entry.

The range is 0 - 65535.

action

deny

permit

network Network route (IP address in dotted notation)

netmask Network mask as wildcard bits (IP address in dotted notation)

mask Network route’s mask (IP address in dotted notation)

maskmask Wildcard mask for network route’s mask ( in dotted notation)

syntax:

Route map deny set operation.

Route map permit set operation.

[ no ] policy ip_access_list access_list < n > number < n > action < deny | permit > [ network < IP
address > ] [ netmask < IP address > ] [ mask < IP address > ] [ maskmask < IP address > ]

example:

Alcatel-host/configure> policy ip_access_list 1 1 permit network 10.0.0.0 netmask 0.255.255.255

This example permits prefixes 10.0.0.0/8, 10.0.0.0/9 and so on.

Router User Guide

22 Chapter : Policy Commands

example:

Alcatel-host/configure> policy ip_access_list 1 1 permit network 10.0.0.0 netmask 0.255.255.255

mask 255.0.0.0 maskmask 0.255.255.255

This example restricts the prefixes to 10.0.0.0/8 only.

applicable systems:

All models.

Router User Guide

Chapter : Policy Commands 23

configure policy route_map

This command configures the policy for router route maps.

Route maps are used for general-purpose matching of routes and setting of route attributes. Each
route_map is comprised of one or more route_map clauses, of the form shown below.

route_map name number [ permit | deny ]

match statements
set statements

A route_map clause is said to match if each of its match statements matches, according to the rules
given below. A route_map is said to succeed if one of its permit clauses clauses matches, and fails if
one of its deny clauses matches. Matching proceeds sequentially and stops at the first match. If the
route_map succeeds, the actions specified by the set statements in the matched clause are performed.

If neither permit nor deny is specified, the default is permit.

Match statements can be:

 match as_path

 match community

 match ip ip_address

Set statements can be:

 set as_path

 set community

 set local_preference

 set metric

 set origin

 set distance

 set metric_type

parameter definition

name Route map name

number A sequence to insert to or delete from exiting route map.

The range is 0 - 65535.

action

deny

permit

Deny the route map.

This is the default value.

Permit the route map.

syntax:

[ no ] policy route_map name number [ action < deny | permit > ]

example:

Alcatel-host/configure> policy route_map Block100 1 permit

Router User Guide

24 Chapter : Policy Commands

next-level commands

configure policy route_map commit

configure policy route_map match

configure policy route_map set

applicable systems:

All models.

Router User Guide

Chapter : Policy Commands 25

configure policy route_map match

This command accesses next-level commands for configuring the policy for matching parameters of
the routes.

next-level commands

configure policy route_map match as_path

configure policy route_map match community

configure policy route_map match ip

Router User Guide

26 Chapter : Policy Commands

configure policy route_map match as_path

This command matches any of the specified BGP AS path access lists.

parameter definition

path_list AS path access list

syntax:

[ no ] policy match as_path path_list < n >

example:

Alcatel-host/configure/policy/route_map Block100 1> match as_path 1

next-level commands

configure policy route_map match ip

configure policy route_map match community

The range is 1 - 199; the maximum list size is 32.

applicable systems:

All models.

Router User Guide

Chapter : Policy Commands 27

configure policy route_map match community

This command matches any of the specified BGP community lists.

syntax:

[ no ] policy match community

example:

Alcatel-host/configure/policy/route_map Block100 1> match community

next-level commands

configure policy route_map match as_path

configure policy route_map match ip

applicable systems:

All models.

Router User Guide

28 Chapter : Policy Commands

configure policy route_map match ip ip_address

This command distributes routes matching the prefix against any of the specified IP access lists.

parameter definition

ip_list Ip access list number(s)

syntax:

[ no ] match ip ip_address ip_list < n >

example:

Alcatel-host/configure/policy/route_map Block100 1> match ip ip_address 20

applicable systems:

All models.

Enter a list of numbers.

The range is 1 - 199.

A maximum of 32 numbers can be in the list.

Router User Guide

Chapter : Policy Commands 29

configure policy route_map set

This command provides access to next-level commands to set parameters for the routes.

next-level commands

configure policy route_map set as_path

configure policy route_map set community

configure policy route_map set distance

configure policy route_map set local_preference

configure policy route_map set metric

configure policy route_map set metric_type

configure policy route_map set origin

Router User Guide

30 Chapter : Policy Commands

configure policy route_map set as_path

This command configures a character string for a BGP AS-path attribute.

parameter definition

prepend AS path access list

tag Set tag as an AS path attribute.

syntax:

[ no ] set as_path [ prepend < n > ] [ tag < n > ]

example:

Alcatel-host/configure/policy/route_map Block100 1> set as_path prepend 100 250 tag 0

Enter a list of numbers.

The range is 1 - 65535; the maximum list size is 32.

Enter a number.

related commands

configure policy route_map set community

configure policy route_map set distance

configure policy route_map set local_preference

configure policy route_map set metric

configure policy route_map set metric_type

configure policy route_map set origin

applicable systems:

All models.

Router User Guide

Chapter : Policy Commands 31

configure policy route_map set community

This command configures the policy for community attributes.

Set the community attribute to the given value or list of values. If the additive keyword is specified,
the list of values augments any communities already present. If the additive keyword is not specified,
the list of values overwrites any communities already present.

parameter definition generate_

number Community number (unsigned)

The range is 1 - 4294967294

The maximum numbers in the list is 32.

aa_nn Community number in aa_nn format

Enter a number or a list of numbers separated by spaces.

The maximum numbers in the list is 32

generate_additive

additive

generate_local_as

local_as

generate_no_advertise

no_advertise

generate_no_export

no_export

Add to the existing community.

Do not send outside local AS.

Do not advertise to any neighbor.

Do not send to next AS

syntax:

[ no ] set community number [ < n > ] [aa_nn < n > ] [ generate_additive < additive > ]
[ generate_local_as < local_as > ] [ generate_no_advertise < no_advertise > ]
[ generate_no_export < no_export > ]

example:

Alcatel-host/configure/policy/route_map Block100 1> set community aa_nn 500:60

related commands

configure policy route_map set as_path

configure policy route_map set distance

configure policy route_map set local_preference

configure policy route_map set metric

configure policy route_map set metric_type

configure policy route_map set origin

applicable systems:

All models.

Router User Guide

32 Chapter : Policy Commands

configure policy route_map set distance

This command sets the BGP protocol preference for the path attribute.

parameter definition

distance Default preference value

syntax:

[ no ] set distance distance < n >

example:

Alcatel-host/configure/policy/route_map Block100 1> set distance 20

related commands

configure policy route_map set as_path

configure policy route_map set community

configure policy route_map set local_preference

configure policy route_map set metric

configure policy route_map set metric_type

configure policy route_map set origin

The range is 0 - 255.

applicable systems:

All models.

Router User Guide

Chapter : Policy Commands 33

configure policy route_map set local_preference

This command configures the BGP local preference path attribute.

parameter definition

local_preference Preference value

The range is 1 - 4292967294.

syntax:

[ no ] set local_preference local_preference < n >

example:

Alcatel-hostconfigure/policy/route_map Block100 1> set local_preference 50

related commands

configure policy route_map set as_path

configure policy route_map set community

configure policy route_map set distance

configure policy route_map set metric

configure policy route_map set metric_type

configure policy route_map set origin

applicable systems:

All models.

Router User Guide

34 Chapter : Policy Commands

configure policy route_map set metric

This command configures the metric value for the destination routing protocol.

parameter definition

metric Metric value

syntax:

[ no ] set metric metric < n >

example:

Alcatel-host/configure/policy/route_map Block100 1> set metric 120

related commands

configure policy route_map set as_path

configure policy route_map set community

configure policy route_map set distance

configure policy route_map set local_preference

configure policy route_map set metric_type

configure policy route_map set origin

The range is 1 - 4294967294.

applicable systems:

All models.

Router User Guide

Chapter : Policy Commands 35

configure policy route_map set metric_type

This command configures the metric type for a route.

parameter definition

type Internal

internal

syntax:

[ no ] set metric_type type < internal >

example:

Alcatel-host/configure/policy/route_map Block100 1> set metric_type internal

related commands

configure policy route_map set as_path

configure policy route_map set community

configure policy route_map set distance

configure policy route_map set local_preference

configure policy route_map set metric

configure policy route_map set origin

Use the IGP metric as the MED for BGP.

applicable systems:

All models.

Router User Guide

36 Chapter : Policy Commands

configure policy route_map set origin

This command configures the origin value for the BGP route.

parameter definition

origin

egp

igp

incomplete

syntax:

[ no ] set origin origin < egp | igp | incomplete >

example:

Alcatel-host/configure/policy/route_map Block100 1> set origin igp

EGP protocol

IGP protocol

Unknown protocol type

next-level commands

configure policy route_map set origin egp

configure policy route_map set origin igp

configure policy route_map set origin incomplete

applicable systems:

All models.

Router User Guide

G

ENERIC

This chapter contains routing commands that are not protocol specific. These commands can be used
interchangeably with the three routing protocols supported by

R

OUTING

C

OMMANDS

Alcatel.

37

Router User Guide

38 Chapter : Generic Routing Commands

configure router

This command provides access to next-level commands.

next-level commands

configure router routerid

Router User Guide

Chapter : Generic Routing Commands 39

configure router routerid

This command configures a router for routing operation.

syntax:

[ no ] router routerid < IP address>

example:

Alcatel-host/configure> router routerid 10.10.10.10

applicable systems:

All models.

Router User Guide

40 Chapter : Generic Routing Commands

show ip routes

This command displays IP routing information for Ethernet ports.

parameter definition

network Network IP address

mask Network mask

protocol

all

bgp

connected

ospf

rip

static

database

rib

fib

Enter an IP address.

Enter a netmask address

All protocols

Border Gateway protocol (BGP)

Connected routes

Open Shortest Path First protocol (OSPF)

Routing Information Protocol (RIP)

Static routes

RIB routes

FIB routes

syntax:

show ip routes [ network < IP address > ] [ mask < netmask > ] [ protocol < all | bgp | connected |
ospf | rip | static > ] [ database < rib | fib > ]

The following table provides parameter definitions for the following screen display examples.

Table 8 Parameter Definitions

term definition

Network Indicates the address of the remote network.

Next Hop Specifies the address of the next router to the remote network

Interface Specifies the interface through which the specified network can be reached.

PVC > Virtual (logical) circuit identification number.

Distance The administrative distance for the route.

Metric The metric for the route.

By default, information is displayed for all routes in the routing table. To display only specific route
information, specify the appropriate protocol or the network mask.

Router User Guide

Chapter : Generic Routing Commands 41

example:

To display all routes, issue the show ip routes command.

example:

To display the route for a specific network and subnet, issue the show ip routes network 123.1.2.0
mask 255.255.255.0 command.

example:

To display the connected ip routes, issue the show ip routes connected command.

example:

To display static routes, issue the show ip routes static command.

example:

To display RIP routes, issue the show ip routes rip command.

example:

To display ospf routes, issue the show ip routes ospf command.

example:

Alcatel-host/show> ip routes bgp

The following screen display example is a typical display showing the destination IP address, metric,
netmask and gateway, status, Ethernet interface, and type of route.

applicable systems:

All models.

Router User Guide

42 Chapter : Generic Routing Commands

Router User Guide

43

BGP4 C

Use BGP clear commands to clear bgp configuration settings.

LEAR

C

OMMANDS

Router User Guide

44 Chapter : BGP4 Clear Commands

clear ip bgp

This command provides access to the following next-level commands.

syntax:

clear ip bgp

next-level commands

clear ip bgp all

clear ip bgp group

clear ip bgp neighbor

example:

Alcatel-host> clear ip bgp

applicable systems:

All models.

Router User Guide

Chapter : BGP4 Clear Commands 45

clear ip bgp all

This command removes all BGP neighbor connections.

syntax:

clear ip bgp all

example:

Alcatel-host> clear ip bgp all

related commands

clear ip bgp group

clear ip bgp neighbor

applicable systems:

All models.

Router User Guide

46 Chapter : BGP4 Clear Commands

clear ip bgp group

This command removes all connections for a BGP group.

parameter definition

group_name Name of the group

syntax:

clear ip bgp group group_name < name >

example:

Alcatel-host> clear ip bgp group north

In this example, all BGP connections that belong to neighbor group north will be cleared.

related commands

clear ip bgp all

clear ip bgp neighbor

applicable systems:

All models.

Router User Guide

Chapter : BGP4 Clear Commands 47

clear ip bgp neighbor

This command removes a specified BGP neighbor connection.

parameter definition

ip_address The IP address of the neighbor

Enter an IP address (in dotted notation) to be cleared.

remote_as The AS number of the remote neighbor to be cleared.

The range is from 1 - 65535.

syntax:

clear ip bgp neighbor ip_address < IP address > remote_as < n >

example:

Alcatel-host> clear ip bgp neighbor 10.1.1.1 200

related commands

clear ip bgp all

clear ip bgp group

applicable systems:

All models.

Router User Guide

49

BGP4 C

Use BGP configure commands to configure all BGP4 parameters.

ONFIGURE

C

OMMANDS

Router User Guide

50 Chapter : BGP4 Configure Commands

configure router bgp

This command configures BGP routing protocol on a router and provides access to the next-level
commands listed below.

parameter definition

as_number The number of an autonomous system.

syntax:

[ no ] router bgp as_number < n >

example:

Alcatel-host/configure> router bgp 10

next-level commands

configure router bgp aggregate_address

configure router bgp always_compare_med

configure router bgp distance

configure router bgp default_metric

configure router bgp group

configure router bgp neighbor

configure router bgp redistribute

The range is 1 - 65535.

Router User Guide

applicable systems:

All models.

Chapter : BGP4 Configure Commands 51

configure router bgp aggregate_address

This command is used to aggregate routes.

parameter definition

network Network IP address in dotted notation

mask Network subnet mask address in dotted notation

generate_as_set

as_set

generate_summary_only

summary_only

suppress_map Name of the route map to suppress

advertise_map Name of route map to control attribute advertisement

attribute_map Name of route map for setting attributes

Generates AS path information

Form a verbose aggregate, whose AS path contains a leading AS sequence
representing the common leading sequence of all contributing routes, and whose AS
path contains a trailing AS set representing all ASes in all contributing paths that could
not be included in the AS sequence. By default, this feature is off, and the AS path is
truncated when the aggregate is formed.

Filters more specific routes from updates

Suppresses transmission of any contributing routes if an aggregate exists. Note that the
contributing route will not be sent even if an outgoing route_map blocks the sending
of the aggregate itself. This cannot be combined with the suppress_map parameter.

Uses the named route_map to suppress the transmission of selected contributing
routes. Contributing routes that do not match the route_map will not be suppressed.
This cannot be combined with the summary_only parameter.

Selects the routes that contribute to the aggregate. The aggregate will only be formed
if matching routes exist. Only the matching routes will be suppressed if summary_only
or suppress_map are configured.

Specifies attributes to be set on the aggregate when it is transmitted.

syntax:

[ no ] aggregate_address network < IP address > mask < subnet mask > [ generate_as_set
< as_set > ] [ generate_summary_only < summary_only > ] [ suppress_map < name > ]
[advertise_map < name > ] [ attribute_map < name > ]

example:

Alcatel-host/configure/router/bgp 10> aggregate_address 100.3.0.0 255.255.0.0

Router User Guide

52 Chapter : BGP4 Configure Commands

related commands

configure router bgp always_compare_med

configure router bgp distance

configure router bgp default_metric

configure router bgp group

configure router bgp neighbor

configure router bgp redistribute

applicable systems:

All models.

Router User Guide

Chapter : BGP4 Configure Commands 53

configure router bgp always_compare_med

This command configures a router to allow the comparison of the multi-exit discriminator for paths
from neighbors in different autonomous systems.

Normally, MED comparison is done on paths within the same autonomous system. This command
allows the comparison to be made for paths received from other autonomous systems.

syntax:

[ no ] always_compare_med

example:

Alcatel-host/configure/router/bgp 10> always_compare_med

related commands

configure router bgp aggregate_address

configure router bgp distance

configure router bgp default_metric

configure router bgp group

configure router bgp neighbor

configure router bgp redistribute

applicable systems:

All models.

Router User Guide

54 Chapter : BGP4 Configure Commands

configure router bgp default_metric

This command configures the default metric value for redistributed BGP routes.

This command forces the routing protocol to use the same metric value for all redistributed routes.

parameter definition

default_metric The default metric value.

syntax:

[ no ] default_metric default_metric < n >

example:

Alcatel-host/configure/router/bgp 10> default_metric 2000

related commands

configure router bgp aggregate_address

configure router bgp always_compare_med

configure router bgp distance

configure router bgp group

configure router bgp neighbor

configure router bgp redistribute

The range is 1 - 4294967294.

Router User Guide

applicable systems:

All models.

Chapter : BGP4 Configure Commands 55

configure router bgp distance

This command changes the default distance value on a router.

Higher values are preferred.

parameter definition

distance Default preference value

The range is 0-255; the default is 170.

syntax:

[ no ] distance distance < n >

example:

Alcatel-host/configure/router/bgp 10> distance 20

Table 9 Default Route Preference (Administrative Distance) Values

How Route is Learned Default

Directly connected network 0 Not configurable.

Static 1 Not configurable.

OSPF non-external route 10 configure router ospf distance ospf non_external

RIP 100 configure router rip distance

Generated or aggregate 130 Applicable to BGP only, and is not configurable.

OSPF AS external routes 150 configure router ospf distance ospf external

BGP 170 configure router bgp distance

Preference

Command to Modify Default Preference

related commands

configure router bgp aggregate_address

configure router bgp always_compare_med

configure router bgp default_metric

configure router bgp group

configure router bgp neighbor

configure router bgp redistribute

applicable systems:

All models.

Router User Guide

56 Chapter : BGP4 Configure Commands

configure router bgp group

This command configures BGP groups.

Neighbors with the same update policies are more easily managed when they are in groups. Group
organization simplifies configuration and streamlines the update process. Neighbor group members
inherit all configuration options of a group. The BGP group sub commands are similar to those found
under the neighbor tree, but they are applied to all neighbors in the group.

parameter definition

name Group name to be configured

group_type

external

external_rt

internal

External routing group

Default group name = AlcatelBgpExternal

External routing group

Default group name = AlcatelBgpExternalRt

Internal routing group

Default group name = AlcatelBgpInternal

syntax:

[ no ] group name < name > group_type < external | external_rt | internal |
internal_ rt >

example:

Alcatel-host/configure/router/bgp 10> group toronto internal

next-level commands

configure router bgp group distribute_list

configure router bgp group filter_list

configure router bgp group next_hop_self

configure router bgp group password

configure router bgp group remove_private_AS

configure router bgp group route_map

applicable systems:

All models.

Router User Guide

Chapter : BGP4 Configure Commands 57

configure router bgp group distribute_list

This command configures filter updates to this group.

parameter definition

access_list IP access list number

The range is 1-199.

filter_option

out

syntax:

[ no ] distribute_list access_list < n > filter_option < out >

example:

Alcatel-host/configure/router/bgp 10/group toronto internal> distribute_list 101 out

related commands

configure router bgp group filter_list

configure router bgp group next_hop_self

configure router bgp group password

configure router bgp group remove_private_AS

configure router bgp group route_map

Outbound direction

applicable systems:

All models.

Router User Guide

58 Chapter : BGP4 Configure Commands

configure router bgp group filter_list

This command configures BGP filters for a specified group.

parameter definition

access list AS path access list

filter_option

out

syntax:

[ no ] filter_list access list < n > filter_option < out >

example:

Alcatel-host/configure/router/bgp 10/group toronto internal> filter_list 103 out

related commands

configure router bgp group distribute_list

configure router bgp group next_hop_self

configure router bgp group password

configure router bgp group remove_private_AS

configure router bgp group route_map

The range is 1-199.

Outbound direction

Router User Guide

applicable systems:

All models.

Chapter : BGP4 Configure Commands 59

configure router bgp group next_hop_self

This command disables the next hop calculation for all peers in the group.

syntax:

next_hop_self

example:

Alcatel-host/configure/router/bgp 10/group blue external> next_hop_self

related commands

configure router bgp group distribute_list

configure router bgp group filter_list

configure router bgp group password

configure router bgp group remove_private_AS

configure router bgp group route_map

applicable systems:

All models.

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60 Chapter : BGP4 Configure Commands

configure router bgp group password

This command configures the TCP MD5 password to enable MD5 authentication for a BGP group.

parameter definition

md5_password TCP MD5 password (string) for the group

syntax:

[ no ] password md5_password < string >

example:

Alcatel-host/configure/router/bgp 10/group toronto internal> password rt56htd

related commands

configure router bgp group distribute_list

configure router bgp group filter_list

configure router bgp group next_hop_self

configure router bgp group remove_private_AS

configure router bgp group route_map

Enter a word.

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 61

configure router bgp group remove_private_AS

This command removes the private AS number from updates that are sent out.

syntax:

[ no ] remove_private_AS

example:

Alcatel-host/configure/router/bgp 10/group toronto internal> remove_private_AS

related commands

configure router bgp group distribute_list

configure router bgp group filter_list

configure router bgp group next_hop_self

configure router bgp group password

configure router bgp group route_map

applicable systems:

All models.

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configure router bgp group route_map

This command configures a route map to a BGP group.

This command can only be applied in the outbound direction.

parameter definition

route_map Route map name

route_map_options

out

syntax:

[ no ] route_map route_map < name > route_map_options < out >

example:

Alcatel-host/configure/router bgp 10/group toronto internal> route_map foo out

related commands

configure router bgp group distribute_list

configure router bgp group filter_list

configure router bgp group next_hop_self

configure router bgp group password

configure router bgp group remove_private_AS

Outbound direction

Router User Guide

applicable systems:

All models.

Chapter : BGP4 Configure Commands 63

configure router bgp neighbor

This command configures a BGP neighbor.

parameter definition

IP address The IP address of the neighbor in dotted notation

remote_as The AS number

The range is 1 - 65535.

syntax:

[ no ] neighbor IP address < IP address > remote_as < n >

example:

Alcatel-host/configure/router/bgp 10> neighbor 101.101.1.2 4

next-level commands

configure router bgp neighbor advertisement_interval

configure router bgp neighbor allowbadid

configure router bgp neighbor default_originate

configure router bgp neighbor description

configure router bgp neighbor distribute_list

configure router bgp neighbor ebgp_multihop

configure router bgp neighbor filter_list

configure router bgp neighbor keep

configure router bgp neighbor logupdown

configure router bgp neighbor maximum_prefix

configure router bgp neighbor neighbor_group

configure router bgp neighbor next_hop_self

configure router bgp neighbor password

configure router bgp neighbor route_map

configure router bgp neighbor timers

configure router bgp neighbor update_source

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related commands

configure router bgp aggregate_address

configure router bgp always_compare_med

configure router bgp distance

configure router bgp default_metric

configure router bgp group

configure router bgp redistribute

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 65

configure router bgp neighbor advertisement_interval

This command configures the minimum time interval for sending BGP route updates.

parameter definition

advertisement_interval Time, in seconds

The range is 1 - 600 seconds.

syntax:

[ no ] advertisement_interval advertisement_interval < n >

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> advertisement_interval 60

applicable systems:

All models.

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configure router bgp neighbor allowbadid

This command permits BGP sessions to be established with routers that represent their router ID as

0.0.0.0 or 255.255.255.255.

syntax:

[ no ] allowbadid

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> allowbadid

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 67

configure router bgp neighbor default_originate

This command sends the default route to the neighbor.

parameter definition

route_map The name of the route map

syntax:

[ no ] default_originate [ route_map < name > ]

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> default_originate altmap5

applicable systems:

All models.

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68 Chapter : BGP4 Configure Commands

configure router bgp neighbor description

This command describes or identifies a neighbor router.

parameter definition

neighbor_description Text string in quotes describing neighbor

syntax:

[ no ] description neighbor_description < “string” >

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> description “foo1”

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 69

configure router bgp neighbor distribute_list

This command configures filter updates to or from this neighbor.

parameter definition

access_list The IP access list number.

The range is 1 - 199.

filter_option

in

syntax:

[ no ] distribute_list access_list < n > filter_option < in >

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> distribute_list 101 in

applicable systems:

All models.

Inbound filter list

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configure router bgp neighbor ebgp_multihop

This command configures multihop EBGP on a neighbor.

syntax:

[ no ] ebgp_multihop

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> ebgp_multihop

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 71

configure router bgp neighbor filter_list

This command configures BGP filters.

parameter definition

access_list AS path access list

The range is 1 - 199.

access_list_option

in

syntax:

[ no ] filter_list access_list < n > access_list_option < in >

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> filter_list 103 in

applicable systems:

All models.

Inbound filter list

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configure router bgp neighbor keep

This command configures neighbor route storage options.

parameter definition

keep_option

all

none

syntax:

keep keep_option < all | none >

example:

Alcatel-host/configure/router/bgp 10/neighbor 10.10.20.1 2> keep all

applicable systems:

All models.

Keep all non-active routes

Don’t store non-active routes

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Chapter : BGP4 Configure Commands 73

configure router bgp neighbor logupdown

This command configures logging of established state transition changes of a neighbor.

syntax:

[ no ] logupdown

example:

Alcatel-host/configure/router/bgp10/neighbor 101.101.1.2 4> logupdown

applicable systems:

All models.

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configure router bgp neighbor maximum_prefix

This command configures the maximum number of BGP routes to be accepted.

If the neighbor sends more prefixes than are configured, the connection to this neighbor will be
broken.

parameter definition

prefix_number Maximum prefix limit

syntax:

maximum_prefix prefix_number < n >

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> maximum_prefix 100000

applicable systems:

All models.

The range is 1 - 1000000.

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Chapter : BGP4 Configure Commands 75

configure router bgp neighbor neighbor_group

This command configures a neighbor to a specific group.

parameter definition

neighbor_group The name of a neighbor group.

syntax:

[ no ] neighbor_group neighbor_group < name >

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> neighbor_group internal-group

applicable systems:

All models.

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76 Chapter : BGP4 Configure Commands

configure router bgp neighbor next_hop_self

This command disables the next hop calculation for this neighbor.

syntax:

next_hop_self

example:

Alcatel-host/configure/router/bgp 10/neighbor 10.10.20.1 2> next_hop_self

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 77

configure router bgp neighbor password

This command configures a password for md5 authentication.

parameter definition

md5_password TCP MD5 password for the BGP session

Enter a word (maximum 80 characters).

syntax:

md5_password < string >

example:

Alcatel-host/configure/router/bgp 10/neighbor 10.10.20.1 2> md5_password asdf

applicable systems:

All models.

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78 Chapter : BGP4 Configure Commands

configure router bgp neighbor route_map

This command applies a route map to a neighbor.

A similar command exists under the group tree for applying route_map to a group of neighbors in the
outbound direction.

parameter definition

route_map The name of a route map

route_map_options Filter options

in

syntax:

[ no ] route_map route_map < name > route_map_options < in >

example:

Alcatel-host/configure/router/bgp 10/neighbor 100.50.23.3 4> route_map B01 in

Inbound direction

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 79

configure router bgp neighbor timers

This command configure keepalive timers for a neighbor (peer).

The holdtime timer value is calculated as three times the value of the keepalive timer.

parameter definition

keepalive The keepalive interval

The range is 2 - 21845; the default is 60.

syntax:

[ no ] timers keepalive < n >

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> timers 120

applicable systems:

All models.

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configure router bgp neighbor update_source

This command configures the source of BGP TCP connections for a specified neighbor as the IP
address specified, instead of the IP address of a physical interface.

This address will be used as the source address for routing updates.

syntax:

[ no ] update_source < IP address >

example:

Alcatel-host/configure/router/bgp 10/neighbor 101.101.1.2 4> update_source 10.10.2.1

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 81

configure router bgp redistribute

This command provides access to the following next-level commands.

Redistribution causes routes from other protocols to be exported via the current protocol. Routes
from the current protocol are always exported, some protocols may provide additional policy
features that allow the suppression of protocol routes.

next-level commands

configure router bgp redistribute connected

configure router bgp redistribute ospf

configure router bgp redistribute rip

configure router bgp redistribute static

related commands

configure router bgp aggregate_address

configure router bgp always_compare_med

configure router bgp distance

configure router bgp default_metric

configure router bgp group

configure router bgp neighbor

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configure router bgp redistribute connected

This command redistributes interface routes.

parameter definition

metric Default metric

route_map Name of the route map to use

syntax:

[ no ] redistribute connected [ metric < n > ] [ route_map < name > ]

example:

Alcatel-host/configure/router/bgp 10> redistribute connected metric 5000

related commands

configure router bgp redistribute ospf

configure router bgp redistribute rip

configure router bgp redistribute static

The range is 0 - 4294967294.

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 83

configure router bgp redistribute ospf

This command configures the router to redistribute OSPF routes.

parameter definition

metric The default metric

The range is 0 - 4294967294.

route_map Name of the route map to use

syntax:

[ no ] redistribute ospf [ metric < n > ] [ route_map < name > ]

example:

Alcatel-host/configure/router/bgp 10> redistribute ospf metric 12000

related commands

configure router bgp redistribute connected

configure router bgp redistribute rip

configure router bgp redistribute static

applicable systems:

All models.

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84 Chapter : BGP4 Configure Commands

configure router bgp redistribute rip

This command configures a router to redistribute RIP routes.

parameter definition

metric The default metric

route_map Name or ID of the route map to use

syntax:

[ no ] redistribute rip [ metric < n > ] [ route_map < name > ]

example:

Alcatel-host/configure/router/bgp 10> redistribute rip route_map east8

related commands

configure router bgp redistribute connected

configure router bgp redistribute ospf

configure router bgp redistribute static

The range is 0 - 4294967294.

applicable systems:

All models.

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Chapter : BGP4 Configure Commands 85

configure router bgp redistribute static

This command configures a router to redistribute static routes.

parameter definition

metric The default metric

The range is 0 - 4294967294.

route_map Name of the route map to use

syntax:

[ no ] redistribute static [ metric < n > ] [ route_map < name > ]

example:

Alcatel-host/configure/router/bgp 10> redistribute static metric 25

related commands

configure router bgp redistribute connected

configure router bgp redistribute ospf

configure router bgp redistribute rip

applicable systems:

All models.

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87

BGP4

Use BGP show commands to display all configured BGP information.

SHOW

C

OMMANDS

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88 Chapter : BGP4 show Commands

show ip bgp

This command accesses the following next-level show commands.

next-level commands

show ip bgp aggregate_address

show ip bgp community

show ip bgp groups

show ip bgp neighbors

show ip bgp paths

show ip bgp regexp

show ip bgp summary

show ip bgp table

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Chapter : BGP4 show Commands 89

show ip bgp aggregate_address

This command displays a list of configured aggregate addresses.

parameter definition

address Aggregate address

Enter an IP address.

mask Aggregate mask

Enter a subnet mask.

syntax:

show ip bgp aggregate_address [ address < IP address > [ mask < subnet mask > ] ]

example:

Alcatel-host> show ip bgp aggregate_address address 100.12.23.0 mask 255.255.255.0

applicable systems:

All models:

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90 Chapter : BGP4 show Commands

show ip bgp community

This command displays routes that match BGP communities.

parameter definition

number Community number (enter a list of unsigned numbers)

aa_nn Community number in aa_nn format

match_local_as

match_no_advertise

match_no_export

match_exact_match

local_as

no_advertise

no_export

exact_match

The maximum list size is 10.

The range is 1 - 4294967294

Enter a list of strings separated by spaces.

The maximum list size is 10 numbers.

Do not send outside local AS (well-known community)

Do not advertise to any peer (well-known community)

Do not export to next AS (well-known community)

Exact match of the communities

syntax:

show ip bgp community [ number < n > ] [ aa_nn < n > ] [ match_local_as < local_as > ]
[ match_no_advertise < no_advertise > ] [ match_no_export < no_export > ]
[ match_exact_match < exact_match > ]

example:

Alcatel-host> show ip bgp community aa_nn 0:999

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Chapter : BGP4 show Commands 91

Table 10 Status and Origin Codes

Status codes

* ( valid )

> ( best )

i ( internal )

Origin codes

i ( IGP)

e (EGP)

? ( incomplete)

The table entry is valid.

The table entry is the best entry to use for that network.

The table entry was learned via an internal BGP session.

Internal BGP

External BGP

Protocol of unknown origin. Typically redistributed into BGP from an IGP.

applicable systems:

All models:

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show ip bgp groups

This command provides information about BGP groups.

syntax:

show ip bgp groups [ < name > ]

example:

Alcatel-host> show ip bgp groups north

screen display example

> show ip bgp groups

BGP group is AlcatelBgpExternal
group type is External, total peers 1, established peers 0, members:

options set :
None.

192.202.2.2

applicable systems:

All models:

Router User Guide