Cisco ASR 900 Series Configuration Manual
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji
16.7.x (Cisco ASR 900 Series)
First Published: 2017-11-17
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CONTENTS
CHAPTER 1
Configuring Pseudowire 1
Pseudowire Overview 1
Limitations 2
Circuit Emulation Overview 3
Structure-Agnostic TDM over Packet 3
Circuit Emulation Service over Packet-Switched Network 4
Asynchronous Transfer Mode over MPLS 6
Transportation of Service Using Ethernet over MPLS 7
Limitations 7
Configuring CEM 8
Configuration Guidelines and Restrictions 8
Configuring a CEM Group 8
Using CEM Classes 10
Configuring a Clear-Channel ATM Interface 12
Configuring CEM Parameters 12
Configuring Payload Size (Optional) 12
Setting the Dejitter Buffer Size 13
Setting an Idle Pattern (Optional) 13
Enabling Dummy Mode 13
Setting a Dummy Pattern 13
Shutting Down a CEM Channel 13
Configuring CAS 14
Information About CAS 14
Configuring CAS 14
Verifying CAS Configuration 16
Configuration Examples for CAS 16
Configuring ATM 17
Configuring a Clear-Channel ATM Interface 17
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Contents
Configuring ATM IMA 18
BGP PIC with TDM Configuration 21
Configuring Structure-Agnostic TDM over Packet (SAToP) 21
Configuring Circuit Emulation Service over Packet-Switched Network (CESoPSN) 23
Configuring a Clear-Channel ATM Pseudowire 24
Configuring an ATM over MPLS Pseudowire 26
Configuring the Controller 26
Configuring an IMA Interface 27
Configuring the ATM over MPLS Pseudowire Interface 29
Configuring 1-to-1 VCC Cell Transport Pseudowire 30
Mapping a Single PVC to a Pseudowire 30
Configuring N-to-1 VCC Cell Transport Pseudowire 31
Configuring 1-to-1 VPC Cell Transport 31
Configuring ATM AAL5 SDU VCC Transport 33
Configuring a Port Mode Pseudowire 35
Optional Configurations 36
Configuring an Ethernet over MPLS Pseudowire 37
Configuring Pseudowire Redundancy 39
Pseudowire Redundancy with Uni-directional Active-Active 41
Restrictions 42
Configuring Pseudowire Redundancy Active-Active— Protocol Based 43
Configuring the Working Controller for MR-APS with Pseudowire Redundancy
Active-Active 43
Configuring the Protect Controller for MR-APS with Pseudowire Redundancy
Active-Active 44
Verifying the Interface Configuration 44
Configuration Examples 45
Example: CEM Configuration 45
Example: BGP PIC with TDM Configuration 45
Example: BGP PIC with TDM-PW Configuration 46
Example: ATM IMA Configuration 47
Example: ATM over MPLS 47
Cell Packing Configuration Examples 48
VC Mode 48
VP Mode 49
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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Contents
Cell Relay Configuration Examples 51
VC Mode 51
VP Mode 52
Example: Ethernet over MPLS 53
CHAPTER 2
CHAPTER 3
Automatic Protection Switching Configuration 57
Automatic Protection Switching 57
Inter Chassis Redundancy Manager 58
Limitations 58
Automatic Protection Switching Interfaces Configuration 59
Configuring a Working Interface 59
Configuring a Protect Interface 60
Configuring Other APS Options 61
Stateful MLPPP Configuration with MR-APS Inter-Chassis Redundancy 63
Monitoring and Maintaining APS 63
Configuring Multi Router Automatic Protection Switching 65
Finding Feature Information 66
Restrictions for MR-APS 66
Information About MR-APS 66
Configuring MR-APS with HSPW-ICRM on a CEM interface 69
CHAPTER 4
Verifying MR-APS 74
Configuration Examples for MR-APS 82
Configuring MR-APS on a POS interface 84
Configuring working node for POS MR-APS 84
Configuring protect node for POS MR-APS 87
Verifying MR-APS on POS interface 91
Configuration Examples for MR-APS on POS interface 93
Hot Standby Pseudowire Support for ATM and TDM Access Circuits 95
Finding Feature Information 95
Prerequisites for Hot Standby Pseudowire Support for ATM and TDM Access Circuits 96
Restrictions for Hot Standby Pseudowire Support for ATM and TDM Access Circuits 96
Information About Hot Standby Pseudowire Support for ATM and TDM Access Circuits 97
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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Contents
How the Hot Standby Pseudowire Support for ATM and TDM Access Circuits Feature
Works 97
Supported Transport Types 97
How to Configure Hot Standby Pseudowire Support for ATM and TDM Access Circuits 98
Configuring a Pseudowire for Static VPLS 98
Configuring Hot Standby Pseudowire Support for ATM and TDM Access Circuits 100
Verifying the Hot Standby Pseudowire Support for ATM and TDM Access Circuits
Configuration 102
Configuration Examples for Hot Standby Pseudowire Support for ATM and TDM Access
Circuits 104
Configuring Hot Standby Pseudowire Support for ATM and TDM Access Circuits on CEM
Circuits Example 104
Additional References 105
CHAPTER 5
PPP and Multilink PPP Configuration 107
Limitations 107
PPP and Multilink PPP 108
Point-to-Point Protocol 108
CHAP or PPP Authentication 108
IP Address Pooling 109
Peer Address Allocation 109
Precedence Rules 110
MLP on Synchronous Serial Interfaces 111
How to Configure PPP 111
Enabling PPP Encapsulation 111
Enabling CHAP or PAP Authentication 112
Configuring IP Address Pooling 114
Global Default Address Pooling Mechanism 114
Defining DHCP as the Global Default Mechanism 114
Defining Local Address Pooling as the Global Default Mechanism 116
Controlling DHCP Network Discovery 117
Configuring IP Address Assignment 118
Disabling or Reenabling Peer Neighbor Routes 119
Configuring Multilink PPP 120
Configuring MLP on Synchronous Interfaces 121
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Contents
Configuring a Multilink Group 122
Configuring PFC and ACFC 124
Configuring ACFC 124
Configuring PFC 125
Changing the Default Endpoint Discriminator 126
Creating a Multilink Bundle 128
Assigning an Interface to a Multilink Bundle 129
Configuring PPP/MLP MRRU Negotiation Configuration on Multilink Groups 130
Disabling PPP Multilink Fragmentation 133
Troubleshooting Tips 134
Troubleshooting PPP 134
Monitoring and Maintaining PPP and MLP Interfaces 134
CHAPTER 6
Transparent SONET or SDH over Packet (TSoP) Protocol 135
Prerequisites for TSoP 135
Restrictions for TSoP 135
Information About TSoP Smart SFP 136
Guidelines for TSoP Smart SFP 136
Configuring the Reference Clock 137
Configuration Examples for TSoP 139
Verification Examples 140
Verifying TSoP Smart SFP 140
Verifying Clock Source 141
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Contents
viii
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
CHAPTER 1
Configuring Pseudowire
This chapter provides information about configuring pseudowire (PW) features on the router.
Pseudowire Overview, page 1
•
Limitations, page 7
•
Configuring CEM, page 8
•
Configuring CAS, page 14
•
Configuring ATM, page 17
•
Configuring Structure-Agnostic TDM over Packet (SAToP), page 21
•
Configuring Circuit Emulation Service over Packet-Switched Network (CESoPSN), page 23
•
Configuring a Clear-Channel ATM Pseudowire, page 24
•
Configuring an ATM over MPLS Pseudowire, page 26
•
Configuring an Ethernet over MPLS Pseudowire, page 37
•
Configuring Pseudowire Redundancy, page 39
•
Pseudowire Redundancy with Uni-directional Active-Active , page 41
•
Restrictions , page 42
•
• Configuring Pseudowire Redundancy Active-Active— Protocol Based, page 43
Configuring the Working Controller for MR-APS with Pseudowire Redundancy Active-Active, page
•
43
Configuring the Protect Controller for MR-APS with Pseudowire Redundancy Active-Active, page 44
•
Verifying the Interface Configuration, page 44
•
Configuration Examples, page 45
•
Pseudowire Overview
The following sections provide an overview of pseudowire support on the router.
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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Limitations
Limitations
Configuring Pseudowire
Effective Cisco IOS XE Release 3.18S:
BGP PIC with TDM Pseudowire is supported on the ASR 900 router with RSP2 module.
•
BGP PIC for Pseudowires, with MPLS Traffic Engineering is supported on the ASR 900 router with
•
RSP1 and RSP2 modules.
Starting Cisco IOS XE Release 3.18.1SP, Pseudowire Uni-directional Active-Active is supported on the RSP1
and RSP3 modules.
If you are running Cisco IOS XE Release 3.17S, the following limitation applies:
BGP PIC with TDM Pseudowire is supported only on the ASR 900 router with RSP1 module.
•
If you are running Cisco IOS XE Release 3.17S and later releases, the following limitations apply:
Channel associated signaling (CAS) is not supported on the T1/E1 and OC-3 interface modules on the
•
router.
BGP PIC is not supported for MPLS/LDP over MLPPP and POS in the core.
•
BGP PIC is not supported for Multi-segment Pseudowire or Pseudowire switching.
•
BGP PIC is not supported for VPLS and H-VPLS
•
.
BGP PIC is not supported for IPv6.
•
If BGP PIC is enabled, Multi-hop BFD should not be configured using the bfd neighbor fall-overr bfd
•
command.
If BGP PIC is enabled, neighbor ip-address weight weight command should not be configured.
•
If BGP PIC is enabled, bgp nexthop trigger delay 6 under the address-family ipv4 command and bgp
•
nexthop trigger delay 7 under the address-family vpnv4 command should be configured. For
information on the configuration examples for BGP PIC–TDM, see Example: BGP PIC with TDM-PW
Configuration, on page 46.
If BGP PIC is enabled and the targeted LDP for VPWS cross-connect services are established over BGP,
•
perform the following tasks:
configure Pseudowire-class (pw-class) with encapsulation "mpls"
◦
configure no status control-plane route-watch under the pw-class
◦
associate the pw-class with the VPWS cross-connect configurations
◦
If you are running Cisco IOS-XE 3.18S, the following restrictions apply for BGP PIC with MPLS TE for
TDM Pseudowire:
MPLS TE over MLPPP and POS in the core is not supported.
•
Co-existence of BGP PIC with MPLS Traffic Engineering Fast Reroute (MPLS TE FRR) is not supported.
•
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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Configuring Pseudowire
Circuit Emulation Overview
Circuit Emulation (CEM) is a technology that provides a protocol-independent transport over IP networks. It
enables proprietary or legacy applications to be carried transparently to the destination, similar to a leased
line.
The Cisco ASR 903 Series Router supports two pseudowire types that utilize CEM transport: Structure-Agnostic
TDM over Packet (SAToP) and Circuit Emulation Service over Packet-Switched Network (CESoPSN). The
following sections provide an overview of these pseudowire types.
Starting with Cisco IOS XE Release 3.15, the 32xT1E1 and 8x T1/E1 interface modules support CEM CESoP
and SATOP configurations with fractional timeslots.
With the 32xT1/E1 and 8xT1/E1 interface modules, the channelized CEM circuits configured under a single
port (fractional timeslot) cannot be deleted or modified, unless the circuits created after the first CEM circuits
are deleted or modified.
The following CEM circuits are supported on the 32xT1/E1 interface module:
T1 mode
Circuit Emulation Overview
192 CESOP circuits with fractional timeslot
•
◦
32 CESOP circuit full timeslot
◦
32 SATOP circuits.
◦
E1 mode
256 CESOP circuit with fractional timeslot.
•
◦
32 CESOP circuit full timeslot
◦
32 SATOP circuit
◦
Structure-Agnostic TDM over Packet
SAToP encapsulates time division multiplexing (TDM) bit-streams (T1, E1, T3, E3) as PWs over public
switched networks. 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 provider edge (PE) devices. For example, a T1 attachment circuit is treated the same way
for all delivery methods, including copper, multiplex in a T3 circuit, a virtual tributary of a SONET/SDH
circuit, or unstructured Circuit Emulation Service (CES).
In SAToP mode the interface is considered as a continuous framed bit stream. The packetization of the stream
is done according to IETF RFC 4553. All signaling is carried out transparently as a part of a bit stream. Figure
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
3
Circuit Emulation Service over Packet-Switched Network
1: Unstructured SAToP Mode Frame Format, on page 4 shows the frame format in Unstructured SAToP
mode.
Figure 1: Unstructured SAToP Mode Frame Format
Table 1: SAToP T1 Frame: Payload and Jitter Limits, on page 4 shows the payload and jitter limits for the
T1 lines in the SAToP frame format.
Table 1: SAToP T1 Frame: Payload and Jitter Limits
Configuring Pseudowire
Minimum JitterMaximum JitterMaximum
Payload
Payload
Table 2: SAToP E1 Frame: Payload and Jitter Limits, on page 4 shows the payload and jitter limits for the
E1 lines in the SAToP frame format.
Table 2: SAToP E1 Frame: Payload and Jitter Limits
Minimum JitterMaximum JitterMaximum
Payload
Payload
For instructions on how to configure SAToP, see Configuring Structure-Agnostic TDM over Packet (SAToP),
on page 21.
Circuit Emulation Service over Packet-Switched Network
CESoPSN encapsulates structured TDM signals as PWs over public switched networks (PSNs). It complements
similar work for structure-agnostic emulation of TDM bit streams, such as SAToP. Emulation of circuits saves
PSN bandwidth and supports DS0-level grooming and distributed cross-connect applications. It also enhances
resilience of CE devices due to the effects of loss of packets in the PSN.
CESoPSN identifies framing and sends only the payload, which can either be channelized T1s within DS3 or
DS0s within T1. DS0s can be bundled to the same packet. The CESoPSN mode is based on IETF RFC 5086.
Each supported interface can be configured individually to any supported mode. The supported services
comply with IETF and ITU drafts and standards.
Minimum JitterMaximum JitterMinimum
26419210320960
Minimum JitterMaximum JitterMinimum
264256103201280
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Configuring Pseudowire
Circuit Emulation Service over Packet-Switched Network
Figure 2: Structured CESoPSN Mode Frame Format, on page 5 shows the frame format in CESoPSN mode.
Figure 2: Structured CESoPSN Mode Frame Format
Table 3: CESoPSN DS0 Lines: Payload and Jitter Limits, on page 5 shows the payload and jitter for the
DS0 lines in the CESoPSN mode.
Table 3: CESoPSN DS0 Lines: Payload and Jitter Limits
DS0
Maximum
Payload
Maximum
Jitter
Minimum
Jitter
Minimum
Payload
Maximum
Jitter
Minimum
Jitter
82563210320401
41283210320802
412833103201203
26432103201604
26440103202005
26448103202406
26456103202807
26464103203208
26472103203609
264801032040010
264881032044011
264961032048012
2641041032052013
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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Asynchronous Transfer Mode over MPLS
Configuring Pseudowire
DS0
Maximum
Payload
Maximum
Jitter
Minimum
Jitter
Minimum
Payload
Maximum
Jitter
Minimum
Jitter
2641121032056014
2641201032060015
2641281032064016
2641361032068017
2641441032072018
2641521032076019
2641601032080020
2641681032084021
2641761032088022
2641841032092023
2641921032096024
For instructions on how to configure SAToP, see Configuring Structure-Agnostic TDM over Packet (SAToP),
on page 21.
Asynchronous Transfer Mode over MPLS
An ATM over MPLS (AToM) PW is used to carry Asynchronous Transfer Mode (ATM) cells over an MPLS
network. It is an evolutionary technology that allows you to migrate packet networks from legacy networks,
26420010320100025
26420810320104026
26421610320108027
26422410320112028
26423210320116029
26424010320120030
26424810320124031
26425610320128032
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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Configuring Pseudowire
Transportation of Service Using Ethernet over MPLS
while providing transport for legacy applications. AToM is particularly useful for transporting 3G voice traffic
over MPLS networks.
You can configure AToM in the following modes:
• N-to-1 Cell—Maps one or more ATM virtual channel connections (VCCs) or virtual permanent connection
(VPCs) to a single pseudowire.
• 1-to-1 Cell—Maps a single ATM VCC or VPC to a single pseudowire.
• Port—Maps a single physical port to a single pseudowire connection.
The Cisco ASR 903 Series Router also supports cell packing and PVC mapping for AToM pseudowires.
This release does not support AToM N-to-1 Cell Mode or 1-to-1 Cell Mode.Note
For more information about how to configure AToM, see Configuring an ATM over MPLS Pseudowire, on
page 26.
Transportation of Service Using Ethernet over MPLS
Ethernet over MPLS (EoMPLS) PWs provide a tunneling mechanism for Ethernet traffic through an
MPLS-enabled Layer 3 core network. EoMPLS PWs encapsulate Ethernet protocol data units (PDUs) inside
MPLS packets and use label switching to forward them across an MPLS network. EoMPLS PWs are an
evolutionary technology that allows you to migrate packet networks from legacy networks while providing
transport for legacy applications. EoMPLS PWs also simplify provisioning, since the provider edge equipment
only requires Layer 2 connectivity to the connected customer edge (CE) equipment. The Cisco ASR 903
Series Router implementation of EoMPLS PWs is compliant with the RFC 4447 and 4448 standards.
The Cisco ASR 903 Series Router supports VLAN rewriting on EoMPLS PWs. If the two networks use
different VLAN IDs, the router rewrites PW packets using the appropriate VLAN number for the local network.
For instructions on how to create an EoMPLS PW, see Configuring an Ethernet over MPLS Pseudowire, on
page 37.
Limitations
If you are running Cisco IOS XE Release 3.17S, the following limitation applies:
BGP PIC with TDM Pseudowire is supported only on the ASR 900 router with RSP1 module.
•
If you are running Cisco IOS XE Release 3.17S and later releases, the following limitations apply:
Channel associated signaling (CAS) is not supported on the T1/E1 and OC-3 interface modules on the
•
router.
BGP PIC is not supported for MPLS/LDP over MLPPP and POS in the core.
•
BGP PIC is not supported for Multi-segment Pseudowire or Pseudowire switching.
•
BGP PIC is not supported for VPLS and H-VPLS
•
.
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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Configuring CEM
Configuring Pseudowire
BGP PIC is not supported for IPv6.
•
If BGP PIC is enabled, Multi-hop BFD should not be configured using the bfd neighbor fall-overr bfd
•
command.
If BGP PIC is enabled, neighbor ip-address weight weight command should not be configured.
•
If BGP PIC is enabled, bgp nexthop trigger delay 6 under the address-family ipv4 command and bgp
•
nexthop trigger delay 7 under the address-family vpnv4 command should be configured. For
information on the configuration examples for BGP PIC–TDM, see Example: BGP PIC with TDM-PW
Configuration, on page 46.
If BGP PIC is enabled and the targeted LDP for VPWS cross-connect services are established over BGP,
•
perform the following tasks:
configure Pseudowire-class (pw-class) with encapsulation "mpls"
◦
configure no status control-plane route-watch under the pw-class
◦
associate the pw-class with the VPWS cross-connect configurations
◦
If you are running Cisco IOS-XE 3.18S, the following restrictions apply for BGP PIC with MPLS TE for
TDM Pseudowire:
MPLS TE over MLPPP and POS in the core is not supported.
•
Co-existence of BGP PIC with MPLS Traffic Engineering Fast Reroute (MPLS TE FRR) is not supported.
•
Configuring CEM
This section provides information about how to configure CEM. CEM provides a bridge between a time-division
multiplexing (TDM) network and a packet network, such as Multiprotocol Label Switching (MPLS). The
router encapsulates the TDM data in the MPLS packets and sends the data over a CEM pseudowire to the
remote provider edge (PE) router. Thus, function as a physical communication link across the packet network.
The following sections describe how to configure CEM:
Note
Configuration Guidelines and Restrictions
Steps for configuring CEM features are also included in the Configuring Structure-Agnostic TDM over
Packet (SAToP), on page 21 and Configuring Circuit Emulation Service over Packet-Switched Network
(CESoPSN), on page 23 sections.
Not all combinations of payload size and dejitter buffer size are supported. If you apply an incompatible
payload size or dejitter buffer size configuration, the router rejects it and reverts to the previous configuration.
Configuring a CEM Group
The following section describes how to configure a CEM group on the Cisco ASR 903 Series Router.
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
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Configuring Pseudowire
SUMMARY STEPS
DETAILED STEPS
enable
1.
configure terminal
2.
controller {t1 | e1} slot/subslot/port
3.
cem-group group-number {unframed | timeslots timeslot}
4.
end
5.
PurposeCommand or Action
Configuring a CEM Group
Step 1
Step 2
Step 3
Step 4
Example:
Router> enable
Example:
Router# configure terminal
controller {t1 | e1} slot/subslot/port
Example:
Router(config)# controller t1 1/0
cem-group group-number {unframed |
timeslots timeslot}
Example:
Router(config-controller)# cem-group
6 timeslots 1-4,9,10
Enables privileged EXEC mode.enable
Enter your password if prompted.
•
Enters global configuration mode.configure terminal
Enters controller configuration mode.
Use the slot and port arguments to specify the slot number and port
•
number to be configured.
Note
The slot number is always
0.
Creates a circuit emulation channel from one or more time slots of a T1 or
E1 line.
The group-number keyword identifies the channel number to be
•
used for this channel. For T1 ports, the range is 0 to 23. For E1 ports,
the range is 0 to 30.
Use the unframed keyword to specify that a single CEM channel is
•
being created including all time slots and the framing structure of the
line.
Step 5
Example:
Router(config-controller)# end
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
Use the timeslots keyword and the timeslot 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.
Exits controller configuration mode and returns to privileged EXEC mode.end
9
Using CEM Classes
Using CEM Classes
A CEM class allows you to create a single configuration template for multiple CEM pseudowires. Follow
these steps to configure a CEM class:
Configuring Pseudowire
Note
SUMMARY STEPS
DETAILED STEPS
The CEM parameters at the local and remote ends of a CEM circuit must match; otherwise, the pseudowire
between the local and remote PE routers will not come up.
You cannot apply a CEM class to other pseudowire types such as ATM over MPLS.Note
enable
1.
configure terminal
2.
class cem cem-class
3.
payload-size size | dejitter-buffer buffer-size | idle-pattern pattern
4.
exit
5.
interface cem slot/subslot
6.
exit
7.
exit
8.
PurposeCommand or Action
Step 1
Step 2
Step 3
10
Enables privileged EXEC mode.enable
Enter your password if prompted.
Example:
Router> enable
•
Enters global configuration mode.configure terminal
Example:
Router# configure terminal
class cem cem-class
Example:
Router(config)# class cem mycemclass
Time Division Multiplexing Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco ASR 900 Series)
Creates a new CEM class
Configuring Pseudowire
Using CEM Classes
PurposeCommand or Action
Step 4
Step 5
Step 6
payload-size size | dejitter-buffer buffer-size | idle-pattern
pattern
Example:
Router(config-cem-class)# payload-size 512
Example:
Router(config-cem-class)# dejitter-buffer 10
Example:
Router(config-cem-class)# idle-pattern 0x55
Example:
Router(config-cem-class)# exit
interface cem slot/subslot
Example:
Example:
Enter the configuration commands common to the
CEM class. This example specifies a sample rate,
payload size, dejitter buffer, and idle pattern.
Returns to the config prompt.exit
Configure the CEM interface that you want to use for
the new CEM class.
Note
The use of the xconnect command can vary
depending on the type of pseudowire you
are configuring.
Router(config)# interface cem 0/0
Example:
Router(config-if)# no ip address
Example:
Router(config-if)# cem 0
Example:
Router(config-if-cem)# cem class mycemclass
Example:
Router(config-if-cem)# xconnect 10.10.10.10 200
encapsulation mpls
Example:
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Configuring a Clear-Channel ATM Interface
Configuring Pseudowire
PurposeCommand or Action
Step 7
Example:
Router(config-if-cem)# exit
Example:
Step 8
Example:
Router(config-if)# exit
Example:
Configuring a Clear-Channel ATM Interface
Configuring CEM Parameters
Exits the CEM interface.exit
Exits configuration mode.exit
The following sections describe the parameters you can configure for CEM circuits.
Note
The CEM parameters at the local and remote ends of a CEM circuit must match; otherwise, the pseudowire
between the local and remote PE routers will not come up.
Configuring Payload Size (Optional)
To specify the number of bytes encapsulated into a single IP packet, use the pay-load size command. The size
argument specifies the number of bytes in the payload of each packet. The range is from 32 to 1312 bytes.
Default payload sizes for an unstructured CEM channel are as follows:
E1 = 256 bytes
•
T1 = 192 bytes
•
DS0 = 32 bytes
•
Default payload sizes for a structured CEM channel depend on the number of time slots that constitute the
channel. Payload size (L in bytes), number of time slots (N), and packetization delay (D in milliseconds) have
the following relationship: L = 8*N*D. The default payload size is selected in such a way that the packetization
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Configuring Pseudowire
delay is always 1 millisecond. For example, a structured CEM channel of 16xDS0 has a default payload size
of 128 bytes.
The payload size must be an integer of the multiple of the number of time slots for structured CEM channels.
Setting the Dejitter Buffer Size
To specify the size of the dejitter buffer used to compensate for the network filter, use the dejitter-buffer size
command. The configured dejitter buffer size is converted from milliseconds to packets and rounded up to
the next integral number of packets. Use the size argument to specify the size of the buffer, in milliseconds.
The range is from 1 to 32 ms; the default is 5 ms.
Setting an Idle Pattern (Optional)
To specify an idle pattern, use the [no] idle-pattern pattern1 command. The payload of each lost CESoPSN
data packet must be replaced with the equivalent amount of the replacement data. The range for pattern is
from 0x0 to 0xFF; the default idle pattern is 0xFF.
Configuring CEM Parameters
Enabling Dummy Mode
Dummy mode enables a bit pattern for filling in for lost or corrupted frames. To enable dummy mode, use
the dummy-mode [last-frame | user-defined] command. The default is last-frame. The following is an
example:
Router(config-cem)# dummy-mode last-frame
Setting a Dummy Pattern
If dummy mode is set to user-defined, you can use the dummy-pattern pattern command to configure the
dummy pattern. The range for pattern is from 0x0 to 0xFF. The default dummy pattern is 0xFF. The following
is an example:
Router(config-cem)# dummy-pattern 0x55
Note
The dummy-pattern command is not supported on the following interface modules:
48-Port T3/E3 CEM interface module
•
48-Port T1/E1 CEM interface module
•
1-port OC-192 Interface module or 8-port Low Rate interface module
•
Shutting Down a CEM Channel
To shut down a CEM channel, use the shutdown command in CEM configuration mode. The shutdown
command is supported only under CEM mode and not under the CEM class.
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Configuring CAS
Configuring CAS
This section provides information about how to configure Channel Associated Signaling (CAS).
Information About CAS
The CAS is a method of signaling, where the signaling information is carried over a signaling resource that
is specific to a particular channel. For each channel there is a dedicated and associated signaling channel.
The Cisco ASR Router with RSP2 module supports CAS with 8-port T1/E1 interface modules and is
interoperable with 6-port Ear and Mouth (E&M) interface modules.
Configuring Pseudowire
Note
The Cisco ASR Router supports CAS only in the E1 mode for the 8-port T1/E1 interface cards. Use the
card type e1 slot/subslot command to configure controller in the E1 mode.
In the E1 framing and signaling, each E1 frame supports 32 timeslots or channels. From the available timeslots,
the timeslot 17 is used for signaling information and the remaining timeslots are used for voice and data.
Hence, this kind of signaling is often referred as CAS.
In the E1 frame, the timeslots are numbered from 1 to 32, where the timeslot 1 is used for frame synchronization
and is unavailable for traffic. When the first E1 frame passes through the controller, the first four bits of
signaling channel (timeslot 17) are associated with the timeslot 2 and the second four bits are associated with
the timeslot 18. In the second E1 frame, the first four bits carry signaling information for the timeslot 3 and
the second four bits for the timeslot 19.
Configuring CAS
To configure CAS on the controller interface, perform the following steps:
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
configure terminal
controller e1 slot/subslot/port
cas
clock source internal
cem-group group-numbertimeslots time-slot-range
end
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Configuring Pseudowire
DETAILED STEPS
Configuring CAS
PurposeCommand or Action
Step 1
Step 2
Step 3
Step 4
Step 5
Example:
Router# configure terminal
controller e1 slot/subslot/port
Example:
Router(config)# controller E1 0/4/2
Example:
Router(config-controller)# cas
Example:
Router(config-controller)# clock source
internal
cem-group group-numbertimeslots
time-slot-range
Enters the global configuration mode.configure terminal
Enters controller configuration mode to configure the E1 interface.
Note
The CAS is supported only in the El mode. Use the card type
e1 slot/subslot command to configure controller in the E1
mode.
Configures CAS on the interface.cas
Sets the clocking for individual E1 links.clock source internal
Creates a Circuit Emulation Services over Packet Switched Network
circuit emulation (CESoPSN) CEM group.
Step 6
Example:
Router(config-controller)# cem-group
0 timeslots 1-31
Example:
Router(config-controller)# end
• cem-group—Creates a circuit emulation (CEM) channel from one
or more time slots of a E1 line.
• group-number—CEM identifier to be used for this group of time
slots. For E1 ports, the range is from 0 to 30.
• timeslots—Specifies that a list of time slots is to be used as
specified by the time-slot-range argument.
• time-slot-range—Specifies 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.
Exits the controller session and returns to the configuration mode.end
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Verifying CAS Configuration
What to Do Next
You can configure CEM interface and parameters such as xconnect.
Verifying CAS Configuration
Use the show cem circuit cem-group-id command to display CEM statistics for the configured CEM circuits.
If xconnect is configured under the circuit, the command output also includes information about the attached
circuit.
Following is a sample output of the show cem circuit command to display the detailed information about
CEM circuits configured on the router:
Router# show cem circuit 0
CEM0/3/0, ID: 0, Line: UP, Admin: UP, Ckt: ACTIVE
Controller state: up, T1/E1 state: up
Idle Pattern: 0xFF, Idle CAS: 0x8
Dejitter: 8 (In use: 0)
Payload Size: 32
Framing: Framed (DS0 channels: 1)
CEM Defects Set
None
Signalling: No CAS
RTP: No RTP
Ingress Pkts: 5001 Dropped: 0
Egress Pkts: 5001 Dropped: 0
CEM Counter Details
Input Errors: 0 Output Errors: 0
Pkts Missing: 0 Pkts Reordered: 0
Misorder Drops: 0 JitterBuf Underrun: 0
Error Sec: 0 Severly Errored Sec: 0
Unavailable Sec: 0 Failure Counts: 0
Pkts Malformed: 0 JitterBuf Overrun: 0
Configuring Pseudowire
Note
The show cem circuit command displays No CAS for the Signaling field. The No CAS is displayed since
CAS is not enabled at the CEM interface level. The CAS is enabled for the entire port and you cannot
enable or disable CAS at the CEM level. To view the CAS configuration, use the show running-config
command.
Configuration Examples for CAS
The following example shows how to configure CAS on a CEM interface on the router:
Router# configure terminal
Router(config)# controller E1 0/4/2
Router(config-controller)# cas
Router(config-controller)# clock source internal
Router(config-controller)# cem-group 0 timeslots 1
Router(config-controller)# exit
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Configuring Pseudowire
Configuring ATM
The following sections describe how to configure ATM features on the T1/E1 interface module:
Configuring a Clear-Channel ATM Interface
To configure the T1 interface module for clear-channel ATM, follow these steps:
SUMMARY STEPS
enable
1.
configure terminal
2.
controller {t1} slot/subslot/port
3.
atm
4.
end
5.
Configuring ATM
DETAILED STEPS
Step 1
Step 2
Step 3
Step 4
Step 5
Example:
Router> enable
Example:
Router# configure terminal
controller {t1} slot/subslot/port
Example:
Router(config)# controller t1 0/3/0
atm
Example:
Router(config-controller)# atm
PurposeCommand or Action
Enables privileged EXEC mode.enable
Enter your password if prompted.
•
Enters global configuration mode.configure terminal
Selects the T1 controller for the port you are configuring (where
slot /subslot identifies the location and /port identifies the port).
Configures the port (interface) for clear-channel ATM. The router
creates an ATM interface whose format is atm/slot /subslot /port
.
Note
The slot number is always
0.
Exits configuration mode.end
Example:
Router(config-controller)# end
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Configuring ATM IMA
What to Do Next
To access the new ATM interface, use the interface atmslot/subslot/port command.
This configuration creates an ATM interface that you can use for a clear-channel pseudowire and other features.
For more information about configuring pseudowires, see Configuring Pseudowire, on page 1
Configuring ATM IMA
Inverse multiplexing provides the capability to transmit and receive a single high-speed data stream over
multiple slower-speed physical links. In Inverse Multiplexing over ATM (IMA), the originating stream of
ATM cells is divided so that complete ATM cells are transmitted in round-robin order across the set of ATM
links. Follow these steps to configure ATM IMA on the Cisco ASR 903 Series Router.
Configuring Pseudowire
Note
SUMMARY STEPS
ATM IMA is used as an element in configuring ATM over MPLS pseudowires. For more information
about configuring pseudowires, see Configuring Pseudowire, on page 1
The maximum ATM over MPLS pseudowires supported per T1/E1 interface module is 500.Note
To configure the ATM interface on the router, you must install the ATM feature license using the license
install atm command. To activate or enable the configuration on the IMA interface after the ATM license is
installed, use the license feature atm command.
For more information about installing licenses, see the Software Activation Configuration Guide, Cisco IOS
XE Release 3S.
You can create a maximum of 16 IMA groups on each T1/E1 interface module.Note
enable
1.
configure terminal
2.
card type {t1 | e1} slot [bay]
3.
controller {t1 | e1} slot/subslot/port
4.
clock source internal
5.
ima group group-number
6.
exit
7.
interface ATMslot/subslot/IMA group-number
8.
no ip address
9.
atm bandwidth dynamic
10.
no atm ilmi-keepalive
11.
exit
12.
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Configuring Pseudowire
DETAILED STEPS
Configuring ATM IMA
PurposeCommand or Action
Step 1
Step 2
Step 3
Step 4
Step 5
Example:
Router> enable
Example:
Router# configure terminal
card type {t1 | e1} slot [bay]
Example:
Router(config)# card type e1 0 0
controller {t1 | e1} slot/subslot/port
Example:
Router(config)# controller e1 0/0/4
Example:
Enables privileged EXEC mode.enable
Enter your password if prompted.
•
Enters global configuration mode.configure terminal
Specifies the slot and port number of the E1 or T1 interface.
Specifies the controller interface on which you want to enable IMA.
Sets the clock source to internal.clock source internal
Step 6
Step 7
Example:
Router(config-controller)# clock source
internal
Example:
ima group group-number
Example:
Router(config-controller)# ima-group 0
scrambling-payload
Example:
Example:
Router(config-controller)# exit
Assigns the interface to an IMA group, and set the
scrambling-payload parameter to randomize the ATM cell payload
frames. This command assigns the interface to IMA group 0.
Note
To add another member link, repeat Step 3 to Step 6 .
This command automatically creates an ATM0/IMAx
interface.
Exits the controller interface.exit
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Configuring ATM IMA
Example:
Configuring Pseudowire
PurposeCommand or Action
Step 8
Step 9
Step 10
interface ATMslot/subslot/IMA group-number
Example:
Router(config-if)# interface atm0/1/ima0
Example:
Router(config-if)# no ip address
Example:
Specify the slot location and port of IMA interface group.
• slot—The location of the ATM IMA interface module.
• group-number—The IMA group.
The example specifies the slot number as 0 and the group number
as 0.
Note
To explicitly configure the IMA group ID for the IMA
interface, use the optional ima group-id command. You
cannot configure the same IMA group ID on two different
IMA interfaces; therefore, if you configure an IMA group
ID with the system-selected default ID already configured
on an IMA interface, the system toggles the IMA interface
to make the user-configured IMA group ID the effective
IMA group ID. The system toggles the original IMA
interface to select a different IMA group ID.
Disables the IP address configuration for the physical layer interface.no ip address
Specifies the ATM bandwidth as dynamic.atm bandwidth dynamic
Step 11
Step 12
20
Router(config-if)# atm bandwidth dynamic
no atm ilmi-keepalive
Disables the Interim Local Management Interface (ILMI) keepalive
parameters.
Example:
Router(config-if)# no atm ilmi-keepalive
Exits configuration mode.exit
Example:
Router(config)# exit
What to Do Next
The above configuration has one IMA shorthaul with two member links (atm0/0 and atm0/1).
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Configuring Pseudowire
BGP PIC with TDM Configuration
BGP PIC with TDM Configuration
To configure the TDM pseudowires on the router, see Configuring CEM, on page 8.
To configure BGP PIC on the router, see IP Routing: BGP Configuration Guide, Cisco IOS XE Release 3S
(Cisco ASR 900 Series).
See the configuration example, Example: BGP PIC with TDM Configuration, on page 45.
Configuring Structure-Agnostic TDM over Packet (SAToP)
Follow these steps to configure SAToP on the Cisco ASR 903 Series Router:
SUMMARY STEPS
enable
1.
configure terminal
2.
controller [t1|e1] slot/sublot
3.
cem-group group-number {unframed | timeslots timeslot}
4.
interface cem slot/subslot
5.
xconnect ip_address encapsulation mpls
6.
exit
7.
DETAILED STEPS
Step 1
Step 2
Step 3
Step 4
Example:
Router> enable
Example:
Router# configure terminal
controller [t1|e1] slot/sublot
Example:
Router(config-controller)# controller t1 0/4
cem-group group-number {unframed | timeslots
timeslot}
Example:
Router(config-if)# cem-group 4 unframed
PurposeCommand or Action
Enables privileged EXEC mode.enable
Enter your password if prompted.
•
Enters global configuration mode.configure terminal
Configures the T1 or E1 interface.
Assigns channels on the T1 or E1 circuit to the CEM
channel. This example uses the unframed parameter to
assign all the T1 timeslots to the CEM channel.
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Configuring Structure-Agnostic TDM over Packet (SAToP)
Configuring Pseudowire
PurposeCommand or Action
Step 5
Step 6
Step 7
interface cem slot/subslot
Example:
Router(config)# interface CEM 0/4
Example:
Router(config-if)# no ip address
Example:
Router(config-if)# cem 4
xconnect ip_address encapsulation mpls
Example:
Router(config-if)# xconnect 10.10.2.204
encapsulation mpls
Example:
Router(config)# exit
Defines a CEM group.
Binds an attachment circuit to the CEM interface to create
a pseudowire. This example creates a pseudowire by
binding the CEM circuit 304 to the remote peer
10.10.2.204.
Exits configuration mode.exit
Note
What to Do Next
When creating IP routes for a pseudowire configuration, we recommend that you build a route from the
cross-connect address (LDP router-id or loopback address) to the next hop IP address, such as ip route
10.10.10.2 255.255.255.254 10.2.3.4.
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