Cisco Systems 3825 User Manual

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

August 14, 2008

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Text Part Number: OL-15667-03

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You can determine whether your equipment is causing interference by turning it off. If the interference stops, it was probably caused by the Cisco equipment or one of its peripheral devices. If the equipment causes interference to radio or television reception, try to correct the interference by using one or more of the following measures:

• Turn the television or radio antenna until the interference stops.

• Move the equipment to one side or the other of the television or radio.

• Move the equipment farther away from the television or radio.

• Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is, make certain the equipment and the television or radio are on circuits controlled by different circuit breakers or fuses.)

Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and negate your authority to operate the product.

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Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

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Preface vii

Document Revision History vii

Objectives vii

Audience viii

Organization viii

Conventions viii

Preface

This preface describes the objectives, audience, organization, and conventions of this software configuration guide.

This preface contains the following sections:

• Document Revision History, page vii

• Objectives, page vii

• Audience, page viii

• Organization, page viii

• Conventions, page viii

• Related Documentation, page ix

• Obtaining Documentation, Obtaining Support, and Security Guidelines, page x

Document Revision History

The Document Revision History table below records technical changes to this document. The table shows the document revision number for the change, the date of the change, and a brief summary of the change. Note that not all Cisco documents use a Document Revision History table.

Revision Date Change Summary

OL-15667-03 August 14, 2008 Provided the following information for Cisco IOS 12.4(19)MR):

OL-15667-02 April 1, 2008 Introduced the following features with Cisco IOS 12.4(16)MR2:

OL-15667-01 March 6, 2008 Initial release.

Described use of the ima group-id command, which the user can employ to configure the IMA Group ID on an IMA interface.

Keyword ignore-vpi-vci added to the xconnect command for n:1 VCC cell mode PW

Objectives

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This guide explains how to configure features that enable the Cisco 3825 Mobile Wireless Edge Router to be implemented in an IP Radio Access Network-Optimization (RAN-O) environment.

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

vii

Audience

This publication is designed for the person who will be responsible for configuring the router. This guide is intended for the following audiences:

• Customers with technical networking background and experience

• System administrators who are familiar with the fundamentals of router-based internet working, but

• System administrators who are responsible for installing and configuring internetworking

Organization

The major sections of this software configuration guide are listed in the following table:

Chapter Title Description

Chapter 1 Overview of the

Chapter 2 Cisco IOS Software Basics Describes what you need to know about the Cisco IOS

Chapter 3 First-Time Configuration Describes how to use the setup command facility to

Chapter 4 Configuring the

Appendix A Cisco 3825 Mobile Wireless

Appendix B Configuration Examples Provides examples of configurations.

who may not be familiar with Cisco

equipment, and who are familiar with Cisco

Cisco 3825 Mobile Wireless Edge Router

Cisco 3825 Mobile Wireless Edge Router in a RAN-O Solution with the Command-Line Interface

Edge Router RAN-O Command Reference

IOS software

Preface

IOS software

Describes the purpose of the Cisco 3825 router and its unique software features.

software.

configure basic attributes of your router.

Describes how to use the Cisco IOS software CLI to configure basic router functionality in a RAN-O environment.

Provides information about new and changed commands.

Conventions

This publication uses the following conventions to convey instructions and information.

Convention Description

boldface font Commands and keywords.

italic font Variables for which you supply values.

[ ] Keywords or arguments that appear within square brackets are optional.

{x | y | z} A choice of required keywords appears in braces separated by vertical bars. You must select one.

screen font

boldface screen

font

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

viii

Examples of information displayed on the screen.

Examples of information you must enter.

OL-15667-03

Preface

Convention Description

< > Nonprinting characters, for example passwords, appear in angle brackets.

[ ] Default responses to system prompts appear in square brackets.

Note Means reader take note. Notes contain helpful suggestions or references to material not covered in the

manual.

Timesaver Means the described action saves time. You can save time by performing the action described in the

paragraph.

Tip Means the following information will help you solve a problem. The tips information might not be

troubleshooting or even an action, but could be useful information, similar to a Timesaver.

Caution Means reader be careful. In this situation, you might do something that could result in equipment

damage or loss of data.

Overview of the Cisco 3825 Mobile Wireless Edge Router

The Cisco 3825 Mobile Wireless Edge Router is a networking platform optimized for use in mobile wireless networks; specifically designed to be used at the cell site edge as a part of a 2G, 3G or 4G Radio Access Network platform specializing in 2/2.5G Global System for Mobile Communication (GSM) and 3G Universal Mobile Telecommunication System (UMTS) RAN backhaul transport and optimization.

The Cisco 3825 router offers high performance at a low cost while meeting the critical requirements for deployment in cell sites, including small size, high availability, and

DC input power flexibility.

This chapter includes the following sections:

• Introduction, page 1-1

• Cisco IOS Software Features, page 1-6

(RAN). The Cisco 3825 Mobile Wireless Edge Router is a general purpose router

Introduction

• MIB Support, page 1-10

• Limitations and Restrictions, page 1-11

• New Features in Cisco IOS Release 12.4(16)MR2, page 1-13

• New Features in Cisco IOS Release 12.4(16)MR1, page 1-13

• New Features in Cisco IOS Release 12.4(16)MR, page 1-27

A typical RAN is composed of thousands of Base Transceiver Stations (BTSs)/Node Bs, hundreds of Base Station Controllers/Radio Network Controllers (BSCs/RNCs), and several Mobile Switching Centers (MSCs). The BTSs/Node Bs and BSCs/RNCs are often separated by large geographic distances, with the BTSs/Node Bs located in cell sites uniformly distributed throughout a region, and the BSCs, RNCs, and MSCs located at suitably chosen central offices (COs) and/or Mobile Telephone Switching Offices (MTSOs). The traffic generated by a BTS/Node B is transported to the corresponding BSC/RNC across a network, referred to as the backhaul network, which is often a hub-and-spoke topology with hundreds of BTSs/Node Bs connected to a given BSC/RNC by point-to-point time-division multiplexing (TDM) trunks. These TDM trunks may be leased line T1/E1s or their logical equivalents, such as microwave links or satellite channels. The interface between the BTS and BSC in GSM and Code

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1-1

Introduction

Division Multiple Access (CDMA) systems is called the Abis interface. The interface between the Node B and RNC in a UMTS system is called the Iub interface (see for sample configurations.

RAN-Optimization Implementation

In RAN-Optimization (RAN-O), the Cisco 3825 router extends IP connectivity to the cell site and BTS. The router provides bandwidth-efficient IP transport of GSM and UMTS voice and data bearer traffic, as well as maintenance, control, and signaling traffic, over the leased line backhaul network between the BTS and leased line termination and aggregation node via compression (cRTP/cUDP) and packet multiplexing (Multilink PPP).

Figure 1-1 shows an example of the placement of and connections for the Cisco 3825 router in RAN-O.

Figure 1-1 Example of Cisco 3825 Router in a RAN-O

T1/E1

Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

Appendix B, “Configuration Examples”,

Active

GSM

BTS or

UMTS

Node-B

Cisco MWR pair

Standby

The BTS site consists of a pair of Cisco 3825 routers. The pair of routers provides an active router and a standby router for redundancy. A failure of the active router causes the standby router to take over as the active router for the BTS site.

Each pair of Cisco 3825 routers at the BTS site is identical in hardware configuration. The two routers connect to each other through the Gigabit Ethernet (GE) interfaces. The individual backhaul links to a Cisco

3825 router are cabled from a single T1/E1 termination block in the BTS, connecting to both the active and standby routers by means of a Y cable. The redundancy design to control the active/standby transitions of the router pair leverages Hot Standby Router Protocol (HSRP) to control the relays on the Cisco

2-port T1/E1-RAN interface card, Cisco product number VWIC-2T1/E1-RAN (for more information, see Cisco 2-port T1/E1-RAN Installation Instructions) in each router to ensure that the relays on the active router are closed while the relays on the standby router are open, thus avoiding double termination of the T1 (or E1).

Cisco Abis and Iub Optimization over IP Implementation

T1/E1 backhaul link to

IP RAN aggregation node

203231

1-2

One solution that mobile wireless operators find of value is Cisco’s ability to optimize RAN backhaul efficiency (see

Figure 1-2). For example, Cisco’s GSM Abis Optimization solution increases the T1/E1

bandwidth efficiency by as much as 50%. This means the current traffic loads can be carried using half as many T1/E1 trunks as are presently used. This allows more voice and data calls to be carried over the existing RAN backhaul network, eliminating the need for the operator to add expensive new T1/E1 trunks as traffic demands grow. It will also allow a number of existing trunks to be decommissioned, putting an end to their recurring costs.

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Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

Another equally important benefit is that substantial excess capacity is now available in the existing RAN backhaul network. The operator can reallocate this recovered bandwidth to carry traffic from other radios, such as UMTS Node Bs, GPRS, EDGE, 1xEV-DO, PWLANs, and other data overlays. This capability reduces the deployment and operating costs for new technologies, since the operator avoids the up-front and recurring costs of supplementing backhaul capacity. It also accelerates time to revenue from deployments of new radio technologies since there is no need for the operator to wait for additional microwave licenses or leased lines to be supplied.

Compliance with 3GPP2 and 3GPP R5 and R6 transport standards is another appealing aspect of Cisco’s RAN-O solution. Cisco converts today’s CDMA transport networks into 3GPP2-compliant IP RAN transport networks, and GSM and R4/R99 UMTS transport networks into R5/R6 IP RAN transport networks now—and adds multi-radio backhaul compression as well. This means operators can enjoy the benefits of IP transport in their CDMA, GSM, and R4/R99 UMTS RANs today.

Figure 1-2 Example of Cisco 3825 Router in a GSM Abis and UMTS Iub Optimization over IP

Introduction

GSM BTS

PWLAN

WCDMA-TDD

WiMAX

(802.16/20)

UMTS Node B

100Base-T

(R4/R99)

HSDPA

IP-PBX BSC

TDM

AT M

RNC

IP-PBX

Cisco

Mobile

Exchange

Internet

Edge

TDM

Cisco MWR

Optimized Abis/lub over IP

AT M

UMTS Node B

(RS/R6)

Cell Site Access Network BSC/RNC Site Mobile

T1/E1

Mobile IP/FA VoIP Content Caching Multi VPN IP Multicasting QoS PPP DHCP Routing

Cisco

ONS 15454

203232

Cisco GSM Abis Optimization over IP

The Cisco GSM Abis Optimization over IP technology improves T1/E1 bandwidth efficiency by 33% to 50%, corresponding to a GSM voice call capacity gain of 50-100% per T1/E1, depending on the nature of the traffic on the interface.

In a GSM RAN, the interface between the BTS and BSC is a 3GPP reference interface called the Abis interface. The physical trunk connecting a BTS and BSC is typically a T1 or E1 circuit, and carries 24 (T1) or 32 (E1) separate 64 kbps DS0 channels. One or two of these DS0 channels is used to carry control and signaling traffic, while the remainder are used to carry bearer traffic—voice and data from mobile

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1-3

Introduction

Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

users. Each DS0 bearer channel carries up to four sub-multiplexed 16 kbps channels, termed sub-rate DS0s. The voice and data bearer traffic is carried over the sub-rate DS0s in Transcoder and Rate Adaptor Unit (TRAU) frames in accordance with 3GPP TS 08.60 v8.2.1, “In-band control of transcoders and rate adaptors for Enhanced Full Rate (EFR) and full rate traffic channels.” There are several types of TRAU frames: full-rate (FR) or enhanced full-rate (EFR) GSM vocoder frames; Adaptive Multi-Rate (AMR) vocoder frames; silent speech frames; and OAM frames. When a sub-rate DS0 is assigned to a call, TRAU frames are generated in accordance with 3GPP TS 08.60 v8.2.1, “In-band control of transcoders and rate adaptors for EFR and full rate traffic channels.” When a sub-rate DS0 is idle, that is, not assigned to a call, a repeating idle pattern is transmitted in accordance with 3GPP TS 08.54 v8.0.1, “Base Station Controller-Base Transceiver Station (BSC-BTS) interface; Layer 1 structure of physical circuits.”

The transcoder and rate adaptation control function that specifies the TRAU frames provides several opportunities to optimize the Abis interface, and thus optimize the backhaul bandwidth efficiency. For example, when Discontinuous Transmission (DTX) is employed over the air interface, the TRAU frames that are transported on the Abis interface contain standardized redundant bit patterns, known as idle (silent) speech frames (FR and EFR) or “no data” frames (AMR), whenever a voice user is silent (typically 40-60% of the time). As another example, bearer channels that are not assigned to calls each carry known idle bit patterns on the Abis interface as mentioned previously. Thus, even though no radio transmissions are made during silent and idle periods, redundant information is nevertheless transported across the backhaul network thereby unnecessarily consuming precious bandwidth.

Cisco Pseudowire Emulation Edge-to-Edge (PWE3)

PWE3 is a mechanism that emulates the essential attributes of a service, such as ATM or EI/T1 (see

Figure 1-3). The required functions of pseudowires (PWs) include encapsulating service-specific Packet

Data Units (PDUs) arriving at an ingress port and carrying them across a path or tunnel, managing their timing and order, and any other operations required to emulate the behavior and characteristics of the service as efficiently as possible.

PW is perceived as an unshared link or circuit of the chosen service. However, there may be deficiencies that impede some applications from being carried on a PW. These limitations should be fully described in the appropriate service-specific documents and applicability statements.

Cisco supports standards-based PWE3 as defined by:

• Structure-agnostic TDM over Packet (SAToP), page 1-16

• Structure-aware TDM CESoPSN, page 1-16

• Transportation of ATM Service via MPLS/IP (PWE3/ATM), page 1-17

• Transportation of ATM Service via L2TPv3, page 1-20

A PW is a connection between two provider edge (PE) devices, which connects two attachment circuits (ACs). An AC can be an ATM virtual path identifier/virtual channel identifier (VPI/VCI) or an T1/E1 link.

1-4

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Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

Figure 1-3 Example of Cisco 3825 Router in a PWE3f

ATM/TDM ATM/TDMxconnectxconnect

Introduction

MPLS/IP or L2TPv3

Pseudowire

Cisco Iub Optimization over IP

The Cisco Iub Optimization over IP technology for R4/R99 (ATM) UMTS RANs improves bandwidth efficiency by as much as 15 to 40%, corresponding to a UMTS voice call capacity gain of 18 to 67%, depending on the type of Iub header and ATM Adaptation Layer traffic sub-cell multiplexing performance. For R5/R6 IP UMTS RANs, Cisco provides compression and low-overhead encryption.

Intelligent Cell Site IP Services

Cisco’s RAN-O solutions also open up the possibility to deliver new profit-enhancing services. This is achieved through the rich set of IP networking features supported in Cisco IOS Software that are now extended to the cell site (see

Cell Site Points-of-Presence (POPs)

Since many cell sites are located in and around downtown areas, hotels, airports, and convention centers, they make attractive sites for co-locating public wireless LAN (PWLAN) access points and other wireless data overlays. Many of these wireless data radios are IP-based. IP networking features, like Mobile IP, VoIP, IP Multicast, Virtual Private Network (VPN), and content caching, enable delivery of new revenue-generating services over these radios. Cisco also provides a wide range of low-latency IP-based quality of service (QoS) and traffic shaping models to allow flexible mixing of multiple traffic types across the same backhaul network. Thus, the cell site becomes a physical point of presence or POP from which to offer hotspot services, or voice and wired Internet service provider (ISP) services to nearby enterprises and residences. The corresponding traffic “rides for free” on the spare backhaul bandwidth made available by Cisco’s Abis and Iub Optimization solutions.

Emulated Circuit

201865

Figure 1-4 on page 1-6).

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Cisco IOS Software Features

GSM/GPRS/

Figure 1-4 Example of Cisco 3825 Router in a Cell Site POP

Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

EDGE BTS

UMTS Node B

(R4/R99)

BSC

TDM

Cisco MWR

Optimized Abis and lub over IP

ATM (AAL2/AAL5)

Cell Site Access Network BSC/RNC Site Mobile

T1/E1

Cisco

ONS 15454

TDM

ATM

RNC

Internet

Edge

203233

Cisco IOS Software Features

There is one version of software available for the Cisco 3825 router. This version of the software is required for implementing the Cisco

3825 router in a Radio Access Network-Optimization (RAN-O)

configuration.

Software features for the RAN-O Implementation

The software required for implementing the Cisco 3825 router consists the Cisco IOS software running on the MIPs-based portion of the Cisco

Cisco IOS software functions added to the Cisco 3825 router for the RAN-O implementation include:

• Redundancy logic—For monitoring Hot Standby Router Protocol (HSRP) information to determine

the active and standby router and control T1 termination.

• Failover logic—To force a switchover for hardware failures or an over-temperature condition.

• Relay control—To open and close the T1/E1 interfaces on the active and standby routers.

• Diagnostic functions—To monitor the “health” of the standby Cisco 3825 router.

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

1-6

3825 router hardware.

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Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

Software Features

Standard Cisco IOS software features supported in the Cisco 3825 router for the RAN-O implementation include:

Simple Services

• DHCP

• PPP

• NAT

• OSPF

• RIP

Intelligent Services

• QoS

• VPN

• IP Multicast

• Mobile IP/FA

Cisco IOS Software Features

• content caching

• MPLS

• L2TPv3

Other Services

• ACFC and PFC Handling During PPP Negotiation

• HSRP

• NTP

• SNMP

Redundancy Support

In a RAN-O application, to ensure availability, the backhaul links to a Cisco 3825 router are redundantly cabled to the Cisco 2-port T1/E1-RAN card. This card, designed specifically for the Cisco These relays allow “Y” cabling for router redundancy where the T1/E1 link is not redundant and default to open. The relays are controlled by HSRP/redundancy protocol between the two routers connected to the same T1/E1.

Note If you choose to use the Cisco 3825 router in a non-redundant configuration, you must close the relays

on the card using the standalone subcommand. Also, redundancy parameters are processed when the router is booted up. These parameters cannot be changed “on the fly.”

MWR 1941-DC-A router and Cisco 3825 router includes relays that activate the T1/E1 ports.

HSRP

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Cisco’s HSRP is used to control which router is active and which is standby. HSRP uses a priority scheme to determine which HSRP-configured router is to be the default active router. Priority is determined first by the configured priority value, then by the IP address. In each case, a higher value is of greater priority.

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

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Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

Cisco IOS Software Features

Configuration Statements for CISCO-IP-RAN-BACKHAUL-MIB

This section contains detailed information on how to enable notifications provided by the CISCO-IP-RAN-BACKHAUL-MIB.

With Cisco IOS Release 12.4(16)MR1, the Cisco 3825 router supports the following MIB:

CISCO-IP-RAN-BACKHAUL-MIB

This MIB is compatible with Cisco Mobile Wireless Transport Manager (MWTM) 5.0 or later. It provides information on the optimization on the optimization of the following traffic types:

• GSM—providing information between a BTS and the corresponding BSC

• UMTS—providing information on optimization between a Node Band the corresponding RNC.

NOTIFICATIONS

ciscoIpRanBackHaulGsmAlarm

Provides information alarms associated with Global System for Mobile Communications (GSM)-Abis interfaces. Only enables GSM Abis. See

RAN-O Command Reference” for more information.

conf t

snmp-server enable traps ipran alarm-gsm

Appendix A, “Cisco 3825 Mobile Wireless Edge Router

ciscoIpRanBackHaulUmtsAlarm

Provides information alarms associated with Universal Mobile Telecommunications System (UMTS)-Iub interfaces. Only enables UMTS Iub. See

Appendix A, “Cisco 3825 Mobile Wireless Edge

Router RAN-O Command Reference” for more information.

conf t

snmp-server enable traps ipran alarm-umts

ciscoIpRanBackHaulRcvdUtil + ciscoIpRanBackHaulSentUtil

Provides information on backhaul utilization. Only enables backhaul utilization. See Appendix A,

“Cisco 3825 Mobile Wireless Edge Router RAN-O Command Reference” for more information.

conf t

snmp-server enable traps ipran util

Note The snmp-server enable traps ipran util command is obsolete. CLI accepts the command to maintain

compatibility.

To specify all notifications, specify the component name. See Appendix A, “Cisco 3825 Mobile

Wireless Edge Router RAN-O Command Reference” for more information.

conf t

snmp-server enable traps ipran

The following configuration statements are used to provide additional information about device and control generation of notifications:

ipran-mib ?

backhaul-notify-interval Interval for backhaul utilization (Obsolete.

Provided only to maintain compatibility.)

location Location of device

snmp-access Specify type snmp connectivity

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Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

ipran-mib ?

threshold-acceptable Acceptable utilization threshold (Obsolete.

threshold-overloaded Overloaded utilization threshold (Obsolete.

threshold-warning Warning utilization threshold (Obsolete. Provided

ipran-mib backhaul-notify-interval

For more information on these commands, see Appendix A, “Cisco 3825 Mobile Wireless Edge Router

RAN-O Command Reference”.

Cisco IOS Software Features

Provided only to maintain compatibility.)

only to maintain compatibility.)

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MIB Support

The Cisco 3825 router supports the following MIBs:

Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

• ADSL-DMT-LINE-MIB

• ADSL-LINE MIB

• ATM-MIB

• BRIDGE-MIB

• CISCO-AAA-SERVER-MIB

• CISCO-AAL5-MIB

• CISCO-ACCESS-ENVMON-MIB

• CISCO-ATM-EXT-MIB

• CISCO-ATM-PVCTRAP-EXTN-MIB

• CISCO-BULK-FILE-MIB

• CISCO-CALL-APPLICATION-MIB

• CISCO-CALL-HISTORY-MIB

• CISCO-CAR-MIB

• CISCO-CAS-IF-MIB

• CISCO-CCME-MIB

• CISCO-CDP-MIB

• CISCO-CIRECUIT-INTERFACE-MIB

• CISCO-CLASS-BASED-QOS-MIB

• CISCO-CONFIG-MAN-MIB

• CISCO-IETF-ATM2-PVCTRAP-MIB-EXTN

• CISCO-IETF-ATM2-PVCTRAP-MIB

• CISCO-IETF-NAT-MIB

• CISCO-IETF-PW-MIB

• CISCO-IETF-PW-MPLS-MIB

• CISCO-IETF-PW-TC-MIB

• CISCO-IF-EXTENSION-MIB

• CISCO-IMAGE-MIB

• CISCO-IP-RAN-BACKHAUL-MIB

• CISCO-IPMROUTE-MIB

• CISCO-MEMORY-POOL-MIB

• CISCO-MVPN-MIB

• CISCO-NBAR-PROTOCOL-DISCOVERY-MIB

• CISCO-NETFLOW-MIB

• CISCO-NTP-MIB

• CISCO-PIM-MIB

• CISCO-PING-MIB

• CISCO-POP-MGMT-MIB

• CISCO-PPPOE-MIB

1-10

• CISCO-DIAL-CONTROL-MIB

• CISCO-DSL-CPE-MIB

• CISCO-ENTITY-ASSET-MIB

• CISCO-ENTITY-EXT-MIB

• CISCO-ENTITY-VENDORTYPE-OLD-MIB

• CISCO-ENVMON-MIB

• CISCO-FLASH-MIB

• CISCO-FRAME-RELAY-MIB

• CISCO-FTP-CLIENT-MIB

• CISCO-HSRP-MIB

• CISCO-ICSUDSU-MIB

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

• CISCO-PROCESS-MIB

• CISCO-QUEUE-MIB

• CISCO-RTTMON-MIB

• CISCO-SAA-APM-MIB

• CISCO-SMI

• CISCO-SNAPSHOT-MIB

• CISCO-SNMP--TARGET-EXT-MIB

• CISCO-SRST-MIB

• CISCO-STACKMAKER-MIB

• CISCO-SYSLOG-MIB

• CISCO-TC

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Limitations and Restrictions

• CISCO-TCP-MIB

• CISCO-VLAN-IFTABLE-RELATIONSHIP-

MIB

• CISCO-VLAN-MEMBERSHIP-MIB

• CISCO-VOICE-ANALOG-IF-MIB

• CISCO-VOICE-ATM-DIAL-CONTROL-MIB

• CISCO-VOICE-COMMON-DIAL-CONTROL-

MIB

• CISCO-VOICE-DIAL-CONTROL-MIB

• CISCO-VOICE-DNIS-MIB

• CISCO-VOICE-ENABLED-LINK-MIB

• CISCO-VOICE-FR-DIAL-CONTROL-MIB

• CISCO-VOICE-IF-MIB

• CISCO-VOICE-NUMBER-EXPANSION-MIB

• CISCO-VOICE-URI-CLASS-MIB

• CISCO-VPDN-MGMT-EXT-MIB

• CISCO-VPDN-MGMT-MIB

• CISCO-VTP-MIB

• DIAL-CONTROL-MIB

• DS1-MIB

• DS3-MIB

• ETHERLIKE-MIB

• EVENT-MIB

• EXPRESSION-MIB

• IF-MIB

• IGMP-MIB

• IMA-MIB

• INT-SERV-GUARANTEED-MIB

• INT-SERV-MIB

• IP-FORWARD-MIB

• ISDN-MIB

• MSDP-MIB

• OLD-CISCO-CHASSIS-MIB

• OLD-CISCO-FLASH-MIB

• OLD-CISCO-INTERFACES-MIB

• OLD-CISCO-IP-MIB

• OLD-CISCO-SYS-MIB

• OLD-CISCO-TCP-MIB

• OLD-CISCO-TS-MIB

• OSPF-MIB

• OSPF-TRAP-MIB

• PIM-MIB

• RFC1213-MIB

• RFC1231-MIB

• RFC1315-MIB

• RFC1406-MIB

• RMON-MIB

• RS-232-MIB

• RSVP-MIB

• SMON-MIB

• SNMP-TARGET-MIB

• SONET-MIB

• TCP-MIB

• UDP-MIB

• VRRP-MIB

• XGCP-MIB

Limitations and Restrictions

The following restrictions applies when using the Cisco 2-port T1/E1-RAN interface card in the Cisco

3825 router:

Caution The Cisco 3825 router does not support online insertion and removal (OIR) of the

Cisco

2-port T1/E1-RAN interface card. Any attempt to perform OIR on a card in a powered up router

might cause damage to the card.

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Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

Limitations and Restrictions

Caution The Cisco 3825 router does not support OIR of network modules. Any attempt to perform OIR on a card

in a powered up router might cause damage to the card.

Note The Cisco NM-2W network interface module only is only supported on the Cisco 3825 router on

shorthaul with or without Inverse Multiplexing over ATM (IMA). It is not supported on the Cisco router on shorthaul with GSM.

RAN-O Implementation Limitations and Restrictions

The following list of restrictions applies when implementing the Cisco 3825 router in a Radio Access Network-Optimization (RAN-O) configuration.

Hardware not Supported on the Cisco 3825 Router

Use of additional voice/WAN interface card (VWIC) cards. The only supported VWIC is the Cisco 2-port T1/E1-RAN.

3825

UMTS Iub and GSM Abis Implementation Limitations and Restrictions

The following list of restrictions applies when implementing the UMTS Iub or GSM Abis application in a RAN-O configuration.

Hardware not Supported for UMTS Iub

The Cisco MWR 1941-DC router does not support UMTS Iub as it does not include the Advanced Integration Module (AIM) slot connector on the motherboard. Only the Cisco and Cisco

3825 router are supported for UMTS Iub.

Hardware not Supported for GSM Abis

The Network Interface Module (NM-2W) does not support GSM Abis as the HDLC Controller channel does not interface with the NM-2W. GSM Abis is only supported through the Cisco 2-port T1/E1-RAN card through the four voice/WAN interface card (VWIC) ports on the Cisco

on page 1-13).

MWR 1941-DC-A router

3825 router (see Figure 1-5

1-12

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New Features in Cisco IOS Release 12.4(16)MR2

Figure 1-5 Example of Cisco 3825 Router VWIC and NM-2W Configuration Options Block Diagram

GSM

• VWIC-2T1/E1-RAN used for T1/E1

• *MUST* reside in one of four WIC slots to traverse HDLC Ctrl (8 GSM E1 max)

NM - 2W

RAN WIC RAN WIC

UMTS

lub

AIM-ATM-8

Module on

Motherboard

RAN WIC RAN WIC RAN WICRAN WICRAN WICRAN WIC

UMTS

lub

NM - 2W

UMTS

• VWIC-2T1/E1-RAN used for T1/E1

• VWIC FPGA unused for UMTS

• Direct routing to AIM-ATM

UMTS

lub

UMTS

lub

• VWIC-2T1/E1-RAN used for T1/E1

• VWIC FPGA unused for IP

• Direct routing to IOS CPU

IOS CPU

HDLC Ctrl

280206

GSM Abis

New Features in Cisco IOS Release 12.4(16)MR2

With Cisco IOS Release 12.4(16)MR2, the Cisco MWR 1941-DC-A router supports the following feature:

• Keyword ignore-vpi-vci Added to xconnect Command, page 1-13

Keyword ignore-vpi-vci Added to xconnect Command

With the ignore-vpi-vci keyword configured, the MWR ignores the VPI/VCI value in the PW packet and does a blind rewrite with the local configured AC-side PVC's VPI/VCI value. This applies only when the xconnect command is configured under the PVC, which is the N:1 with N=1 special case. It does not apply when the xconnect command is configured under the subinterface, which supports N>1.

The xconnect command with keyword ignore-vpi-vci results in the PVC mapping being done in a cooperative way if the MWR works the same way as the receiving router. Without this command, the MWR checks the VPI/VCI value inside PW packet for matches against the local configured PVC or PVC-mapping. With the ignore-vpi-vci keyword configured, the MWR ignores the VPI/VCI header inside the received PW packet and does a blind rewrite with the local configured AC-side PVC's VPI/VCI value.

New Features in Cisco IOS Release 12.4(16)MR1

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With Cisco IOS Release 12.4(16)MR1, the Cisco 3825 router supports the following:

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

1-13

New Features in Cisco IOS Release 12.4(16)MR1

• Emulation of TDM Circuit via MPLS/IP (PWE3/TDM), page 1-14

–

Structure-agnostic TDM over Packet (SAToP), page 1-16

–

Structure-aware TDM CESoPSN, page 1-16

• Transportation of ATM Service via MPLS/IP (PWE3/ATM), page 1-17

–

Transparent Cell Transport Service/ATM Port Mode, page 1-17

–

ATM N-to-One VCC Cell Mode, page 1-17

–

ATM AAL5 CPCS-SDU Mode, page 1-18

–

ATM One-to-One VCC Cell Mode, page 1-18

• Transportation of ATM Service via L2TPv3, page 1-20

–

ATM Port Cell Relay Service, page 1-20

–

ATM VCC Cell Relay Service, page 1-20

–

ATM AAL5-SDU Mode, page 1-21

• Asymmetric PWE3, page 1-22

• Ethernet over MPLS, page 1-23

Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

–

VLAN Mode, page 1-23

–

Port Mode, page 1-23

• PWE3 over MLPPP, page 1-24

• PWE3 Redundancy, page 1-24

–

TDM PWE3 Redundancy, page 1-25

–

ATM PWE3 Redundancy, page 1-25

–

Ethernet PWE3 Redundancy, page 1-25

• Maximum Number of Supported ATM Ports, page 1-26

• ATM Cell Switching, page 1-26

Emulation of TDM Circuit via MPLS/IP (PWE3/TDM)

PWE3 is a mechanism that emulates the essential attributes of a T1/E1 line over a packet-switched network (PSN). This evolutionary technology allows you to migrate all packet networks from legacy TDM networks, yet provides transport for legacy applications. PWE3/TDM emulates T1/E1 unstructured and structured lines, including NxDS0 circuits over a Multiprotocol Label Switching (MPLS) infrastructure.

Configuration for provisioning and creating the PW is done through the existing xconnect interface.

A new command cem-group has been added to this feature to create a circuit emulation (CEM) channel from one or more time slots of T1/E1.

The group-number keyword identifies the group number used for this channel.

1-14

• For T1 controller, the range is 0-23. (24 cem-groups id)

• For E1 controller, the range is 0-30. (30 cem-groups id)

Use the unframed keyword to specify that a single CEM channel is being created, including all time slots with no framing structure defined. If time slots are defined, the PWE3 circuit is circuit emulation service over packet-switched network (CESoPSN).

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Use the time slots keyword and the timeslot-range argument to specify the time slots to be included in the CEM channel. The list of time slots may include commas and hyphens with no spaces between the numbers, commas, and hyphens.

The following example illustrates the use of the cem-group command:

SATOP

controller el 0/0/0 cem-group 0 unframed

int cem 0/0/0 cem 0 xconnect 10.10.10.10 200 encap mpls

CESoPSN

controller e1 0/0/1 cem-group 0 timeslots 1-31

int cem 0/0/1 cem 0 xconnect 10.10.10.10 200 encap mpls

New Features in Cisco IOS Release 12.4(16)MR1

A new command sample-rate has been added to this feature to specify in milliseconds the rate that hardware samples data on the attached circuit.

The default is 1 ms. The sample-rate command translates into the payload-size that is sent over the circuit.

• 32-time slots at 1 ms = 256-bytes (32-time slots * 8-bytes/timeslot/ms)

• 24-time slots at 2 ms = 384-bytes (24-time slots * 16-bytes/timeslot/ms)

• 10-time slots at 1 ms = 80-bytes (10-time slots * 8-bytes/timeslot/ms)

The following example illustrates the use of the sample-rate command:

interface CEM0/0/0 no ip address cem 0 sample-rate 2 xconnect 10.10.10.10 200 encapsulation mpls

A new command dejitter-buffer has been added to this feature to specify the size of the dejitter-buffer used to compensate for the network jitter.

• Use the size argument to specify the size of the buffer in milliseconds.

• Size can vary from 4 - 500 ms; default is 4 ms.

The following example illustrates the use of the dejitter-buffer command:

interface CEM0/0/0 no ip address cem 0

dejitter-buffer 10

xconnect 10.10.10.10 200 encapsulation mpls

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A new command idle-pattern has been added to this feature to specify the data pattern transmitted on the T1/E1 when missing packets are detected on the PWE3 circuit.

The default idle-pattern command is 0xFF.

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New Features in Cisco IOS Release 12.4(16)MR1

The following example illustrates the use of the idle-pattern command:

interface CEM0/0/0 no ip address

cem 0 idle-pattern 0x55 xconnect 10.10.10.10 200 encapsulation mpls

A new command shutdown has been added to this feature to administratively shut down the CEM channel.

Default: cem channel is created in a “no shut” state.

The following example illustrates the use of the shutdown command:

interface CEM0/0/0

no ip address

cem 0 shutdown xconnect 10.10.10.10 200 encapsulation mpls

A new command class cem has been added to this feature to allow CEM interface parameters to be configured in a class and applied to CEM interfaces together. This command works in the same manner for CEM interfaces as the pseudowire-class command does for xconnect.

Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

The following example illustrates the use of the class cem command:

class cem mycemclass

dejitter-buffer 10

sample-rate 2

interface CEM0/0/0

no ip address

cem 0 xconnect 10.10.10.10 200 encapsulation mpls cem class mycemclass

Structure-agnostic TDM over Packet (SAToP)

SAToP encapsulates TDM bit-streams (T1, E1, T3, E3) as PWs over PSNs. It disregards any structure that may be imposed on streams, in particular the structure imposed by the standard TDM framing.

The protocol used for emulation of these services does not depend on the method in which attachment circuits are delivered to the PEs. For example, a T1 attachment circuit is treated in the same way regardless of whether it is delivered to the PE on copper, multiplexed in a T3 circuit, mapped into a virtual tributary of a SONET/SDH circuit, or carried over an ATM network using unstructured ATM circuit emulation service (CES) [ATM-CES]. Termination of any specific “carrier layers” used between the PE and CEM is performed by an appropriate network service provider (NSP).

Structure-aware TDM CESoPSN

1-16

CESoPSN encapsulates structured (NxDS0) TDM signals as PWs over PSNs. It complements similar work for structure-agnostic emulation of TDM bit-streams, such as PWE3-SAToP.

Emulation of NxDS0 circuits saves PSN bandwidth and supports DS0-level grooming and distributed cross-connect applications. It also enhances resilience of CE devices to the effects of loss of packets in the PSN.

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New Features in Cisco IOS Release 12.4(16)MR1

Transportation of ATM Service via MPLS/IP (PWE3/ATM)

An ATM PW is used to carry ATM cells over an MPLS network. It is an evolutionary technology that allows you to migrate all packet networks from legacy ATM networks, yet provides transport for legacy applications.

Configuration for provisioning and creating the PW is done through the existing xconnect command.

The following PW modes are supported in this release:

• Transparent Cell Transport Service/ATM Port Mode, page 1-17

• ATM N-to-One VCC Cell Mode, page 1-17

• ATM AAL5 CPCS-SDU Mode, page 1-18

• ATM VCC Cell Relay Service, page 1-20

The following examples illustrates how different modes of PWs are configured.

Transparent Cell Transport Service/ATM Port Mode

ATM port mode maps the entire ATM interface to a PW. Use the xconnnect command under the interface mode to configure a port mode PW.

A sample configuration is written as follows:

interface ATM0/0/0 no ip address scrambling-payload atm mcpt-timers 1000 2000 3000 no atm ilmi-keepalive atm cell-packing 28 mcpt-timer 3 xconnect 99.99.99.99 100 encapsulation mpls sequencing both pvc 1/35 l2transport encapsulation aal0 ! pvc 1/36 l2transport encapsulation aal0 ! pvc 1/37 l2transport encapsulation aal0 !

ATM N-to-One VCC Cell Mode

ATM N:1 VCC cell relay mode maps one or more permanent virtual circuits (PVCs) to one PW. There are two ways to configure N:1 VCC in cell relay mode:

1. When only one PVC needs to be mapped to a PW, configure the xconnect command under the PVC

mode to configure a N:1 VCC cell relay mode PW.

A sample configuration is written as follows:

interface ATM0/0/1 no ip address load-interval 30 scrambling-payload atm mcpt-timers 1000 2000 3000 no atm ilmi-keepalive pvc 0/101 l2transport encapsulation aal0 cell-packing 28 mcpt-timer 3

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New Features in Cisco IOS Release 12.4(16)MR1

xconnect 99.99.99.99 1101 encapsulation mpls sequencing both

2. When more than one PVC needs to be mapped to a PW, configure the xconnect command under the

subinterface mode to configure N:1 VCC cell in relay mode PW. All PVCs configured under this

subinterface are mapped to the PW.

A sample configuration is written as follows:

interface ATM0/0/1.1 multipoint

no snmp trap link-status

atm cell-packing 28 mcpt-timer 3

xconnect 99.99.99.99 1200 encapsulation mpls sequencing both

pvc 1/35 l2transport

encapsulation aal0

pvc 1/36 l2transport

encapsulation aal0

pvc 1/37 l2transport

encapsulation aal0

ATM AAL5 CPCS-SDU Mode

Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

ATM adaptation layer 5 (AAL5) SDU mode maps one AAL5 type PVC to a PW. Use the xconnect command under an AAL5 encapsulation type PVC to configure AAL5 SDU mode PW.

A sample configuration is written as follows:

interface ATM0/0/1

no ip address

load-interval 30

scrambling-payload

no atm ilmi-keepalive

pvc 0/100 l2transport

encapsulation aal5

xconnect 99.99.99.99 1100 encapsulation mpls sequencing both

ATM One-to-One VCC Cell Mode

ATM 1:1 VCC cell relay mode maps one PVC to a PW. Use a one-to-one keyword in the xconnect command mode to specify a 1:1 VCC relay mode PW.

A sample configuration is written as follows:

interface ATM0/0/1

no ip address

load-interval 30

scrambling-payload

atm mcpt-timers 1000 2000 3000

no atm ilmi-keepalive

pvc 0/102 l2transport

encapsulation aal0

cell-packing 28 mcpt-timer 3

xconnect 99.99.99.99 1102 encapsulation mpls sequencing both one-to-one

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Cell Packing

Cell packing or concatenation supports Port, N:1 VCC cell, or 1:1 VCC cell mode. Cell packing can be configured with a parameter of a maximum number of cells and a parameter of cell packing timer.

“atm mcpt-timers [timer1] [timer2] [timer3]” can be used under the interface mode to configure three cell packing timer values. Timer values are in microseconds, and the granularity is 1,000 microseconds, namely 1 millisecond. The timer value is referenced by the “atm cell-packing …” and “cell-packing …” commands.

The sample below configures cell packing for ATM port modes. It specifies a maximum number of cells as 28 and a cell packing timer as 3,000 microseconds.

New Features in Cisco IOS Release 12.4(16)MR1

PVC Mapping

The sample below configures cell packing for the N:1 VCC cell relay mode PW. It specifies a maximum number of cells as 20 and a cell packing timer as 4,000 microseconds.

interface ATM0/0/1 no ip address load-interval 30 scrambling-payload atm mcpt-timers 2000 3000 4000 no atm ilmi-keepalive pvc 0/101 l2transport encapsulation aal0 cell-packing 20 mcpt-timer 3 xconnect 99.99.99.99 1101 encapsulation mpls sequencing both

The pw-pvc command configures PVC mapping or rewrites for PW-configured PVCs. It specifies the PW-side vpi/vci value used in sending and receiving PW packets for specified PVCs.

The following example illustrates the use of the pw-pvc command:

pvc 0/40 l2transport encapsulation aal0 pw-pvc 1/40 xconnect 1.1.1.1 40 encapsulation mpls

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New Features in Cisco IOS Release 12.4(16)MR1

Transportation of ATM Service via L2TPv3

This service transports ATM services over IP networks. It allows you to migrate all PSNs from ATM legacy networks while still providing ATM legacy services.

The following PW modes are supported in this release:

• ATM Port Cell Relay Service, page 1-20

• ATM VCC Cell Relay Service, page 1-20

• ATM AAL5-SDU Mode, page 1-21

Configuring Layer 2 Tunnel Protocol version 3 (L2TPv3)-based PWs is very similar to configuring MPLS-based PWs, except that a pseudowire-class command is required to be configured for L2TPv3-based PWs.

A sample configuration of the L2TPv3 pseudowire-class command is written as follows:

pseudowire-class l2tp

encapsulation l2tpv3

sequencing both

ip local interface Loopback0

Chapter 1 Overview of the Cisco 3825 Mobile Wireless Edge Router

ATM Port Cell Relay Service

ATM port mode maps the entire ATM interface to a PW. Use the xconnnect command under the interface mode to configure a port mode PW. The ATM interface maps to the PW.

A sample configuration is written as follows:

interface ATM0/0/0

no ip address

scrambling-payload

atm mcpt-timers 1000 2000 3000

no atm ilmi-keepalive

atm cell-packing 28 mcpt-timer 3

xconnect 99.99.99.99 100 pw-class l2tp

pvc 1/35 l2transport

encapsulation aal0

pvc 1/36 l2transport

encapsulation aal0

pvc 1/37 l2transport

encapsulation aal0

ATM VCC Cell Relay Service

ATM N:1 VCC cell relay mode maps one or more PVCs to one PW. There are two ways to configure N:1 VCC in cell relay mode:

1. When only one PVC needs to be mapped to the PW, configure the xconnect command under the

PVC mode to configure a N:1 VCC cell relay mode PW.

1-20

A sample configuration is written as follows:

interface ATM0/0/1

no ip address

load-interval 30

scrambling-payload

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+ 328 hidden pages

Cisco Systems 3825 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

CONTENTS

Preface

Overview of the Cisco 3825 Mobile Wireless Edge Router

Introduction

RAN-Optimization Implementation

Cisco Abis and Iub Optimization over IP Implementation

Cisco GSM Abis Optimization over IP

Cisco Pseudowire Emulation Edge-to-Edge (PWE3)

Cisco Iub Optimization over IP

Intelligent Cell Site IP Services

Cell Site Points-of-Presence (POPs)

Cisco IOS Software Features

Software features for the RAN-O Implementation

Software Features

Redundancy Support

HSRP

Configuration Statements for CISCO-IP-RAN-BACKHAUL-MIB

MIB Support

Limitations and Restrictions

RAN-O Implementation Limitations and Restrictions

Hardware not Supported on the Cisco 3825 Router

UMTS Iub and GSM Abis Implementation Limitations and Restrictions

Hardware not Supported for UMTS Iub

Hardware not Supported for GSM Abis

New Features in Cisco IOS Release 12.4(16)MR2

Keyword ignore-vpi-vci Added to xconnect Command

New Features in Cisco IOS Release 12.4(16)MR1

Emulation of TDM Circuit via MPLS/IP (PWE3/TDM)

Structure-agnostic TDM over Packet (SAToP)

Structure-aware TDM CESoPSN

Transportation of ATM Service via MPLS/IP (PWE3/ATM)

Transparent Cell Transport Service/ATM Port Mode

ATM N-to-One VCC Cell Mode

ATM AAL5 CPCS-SDU Mode

ATM One-to-One VCC Cell Mode

Cell Packing

PVC Mapping

Transportation of ATM Service via L2TPv3

ATM Port Cell Relay Service

ATM VCC Cell Relay Service