Configuring Pseudowire

This chapter provides information about configuring pseudowire (PW) features on the router.

Pseudowire Overview

The following sections provide an overview of pseudowire support on the router.

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.

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.

  • BGP PIC is not supported for IPv6.

  • If BGP PIC is enabled, Multi-hop BFD should not be configured using the bfd neighbor fall-over r 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.

  • 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.

The following restrictions are applicable only if the BFD echo mode is enabled on the Ethernet interface carrying CEM or TDM traffic:

  • When the TDM interface module is present in anyone of the slot—0, 1, or 2, then the corresponding Ethernet interface module carrying the CEM traffic should also be present in one of these slots.

  • When the TDM interface moduleis present in anyone of the slot—3, 4, or 5, then the corresponding Ethernet interface module carrying the CEM traffic should also be present in one of these slots.

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

    • 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. Unstructured SAToP Mode Frame Format shows the frame format in Unstructured SAToP mode.

Figure 1. Unstructured SAToP Mode Frame Format

#con_1729521__ shows the payload and jitter limits for the T1 lines in the SAToP frame format.

Table 1. SAToP T1 Frame: Payload and Jitter Limits

Maximum Payload

Maximum Jitter

Minimum Jitter

Minimum Payload

Maximum Jitter

Minimum Jitter

960

320

10

192

64

2

#con_1729521__ shows the payload and jitter limits for the E1 lines in the SAToP frame format.

Table 2. SAToP E1 Frame: Payload and Jitter Limits

Maximum Payload

Maximum Jitter

Minimum Jitter

Minimum Payload

Maximum Jitter

Minimum Jitter

1280

320

10

256

64

2

For instructions on how to configure SAToP, see Configuring Structure-Agnostic TDM over Packet (SAToP).

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.

Structured CESoPSN Mode Frame Format shows the frame format in CESoPSN mode.

Figure 2. Structured CESoPSN Mode Frame Format

Table 1 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

1

40

320

10

32

256

8

2

80

320

10

32

128

4

3

120

320

10

33

128

4

4

160

320

10

32

64

2

5

200

320

10

40

64

2

6

240

320

10

48

64

2

7

280

320

10

56

64

2

8

320

320

10

64

64

2

9

360

320

10

72

64

2

10

400

320

10

80

64

2

11

440

320

10

88

64

2

12

480

320

10

96

64

2

13

520

320

10

104

64

2

14

560

320

10

112

64

2

15

600

320

10

120

64

2

16

640

320

10

128

64

2

17

680

320

10

136

64

2

18

720

320

10

144

64

2

19

760

320

10

152

64

2

20

800

320

10

160

64

2

21

840

320

10

168

64

2

22

880

320

10

176

64

2

23

920

320

10

184

64

2

24

960

320

10

192

64

2

25

1000

320

10

200

64

2

26

1040

320

10

208

64

2

27

1080

320

10

216

64

2

28

1120

320

10

224

64

2

29

1160

320

10

232

64

2

30

1200

320

10

240

64

2

31

1240

320

10

248

64

2

32

1280

320

10

256

64

2

For instructions on how to configure SAToP, see Configuring Structure-Agnostic TDM over Packet (SAToP).

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, 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.


Note
This release does not support AToM N-to-1 Cell Mode or 1-to-1 Cell Mode.

For more information about how to configure AToM, see Configuring an ATM over MPLS Pseudowire.

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.

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.

  • BGP PIC is not supported for IPv6.

  • If BGP PIC is enabled, Multi-hop BFD should not be configured using the bfd neighbor fall-over r 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.

  • 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.

The following restrictions are applicable only if the BFD echo mode is enabled on the Ethernet interface carrying CEM or TDM traffic:

  • When the TDM interface module is present in anyone of the slot—0, 1, or 2, then the corresponding Ethernet interface module carrying the CEM traffic should also be present in one of these slots.

  • When the TDM interface moduleis present in anyone of the slot—3, 4, or 5, then the corresponding Ethernet interface module carrying the CEM traffic should also be present in one of these slots.

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
Steps for configuring CEM features are also included in the Configuring Structure-Agnostic TDM over Packet (SAToP) and Configuring Circuit Emulation Service over Packet-Switched Network (CESoPSN) sections.

Configuration Guidelines and Restrictions

  • 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.

  • We recommend you to tune the dejitter buffer setting across Cisco ASR 900 Series router variants in case of interoperability scenarios to achieve better latency.

Configuring a CEM Group

The following section describes how to configure a CEM group on the Cisco ASR 903 Series Router.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. controller {t1 | e1} slot/subslot/port
  4. cem-group group-number {unframed | timeslots timeslot }
  5. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

controller {t1 | e1} slot/subslot/port

Example:


Router(config)# controller t1 1/0

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.
Step 4

cem-group group-number {unframed | timeslots timeslot }

Example:


Router(config-controller)# cem-group 6 timeslots 1-4,9,10

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.
  • 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.
Step 5

end

Example:


Router(config-controller)# end

Exits controller configuration mode and returns to privileged EXEC mode.

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:


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.

Note
You cannot apply a CEM class to other pseudowire types such as ATM over MPLS.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. class cem cem-class
  4. payload-size size | dejitter-buffer buffer-size | idle-pattern pattern
  5. exit
  6. interface cem slot/subslot
  7. exit
  8. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

class cem cem-class

Example:


Router(config)# class cem mycemclass

Creates a new CEM class

Step 4

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

Enter the configuration commands common to the CEM class. This example specifies a sample rate, payload size, dejitter buffer, and idle pattern.

Step 5

exit

Example:


Router(config-cem-class)# exit

Returns to the config prompt.

Step 6

interface cem slot/subslot

Example:

Example:


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:

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.
Step 7

exit

Example:


Router(config-if-cem)# exit

Example:

Exits the CEM interface.

Step 8

exit

Example:


Router(config-if)# exit

Example:

Exits configuration mode.

Configuring a Clear-Channel ATM Interface

Configuring CEM Parameters

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 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.

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.

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

  1. enable
  2. configure terminal
  3. controller { t1 } slot/subslot/port
  4. atm
  5. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

controller { t1 } slot/subslot/port

Example:


Router(config)# controller t1 0/3/0

Selects the T1 controller for the port you are configuring (where slot /subslot identifies the location and /port identifies the port).

Step 4

atm

Example:


Router(config-controller)# atm

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.
Step 5

end

Example:


Router(config-controller)# end

Exits configuration mode.

What to do next

To access the new ATM interface, use the interface atm slot/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

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.


Note
ATM IMA is used as an element in configuring ATM over MPLS pseudowires. For more information about configuring pseudowires, see Configuring Pseudowire

Note
The maximum ATM over MPLS pseudowires supported per T1/E1 interface module is 500.

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.


Note
You can create a maximum of 16 IMA groups on each T1/E1 interface module.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. card type {t1 | e1 } slot [bay ]
  4. controller {t1 | e1 } slot /subslot /port
  5. clock source internal
  6. ima group group-number
  7. exit
  8. interface ATM slot /subslot /IMA group-number
  9. no ip address
  10. atm bandwidth dynamic
  11. no atm ilmi-keepalive
  12. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

card type {t1 | e1 } slot [bay ]

Example:


Router(config)# card type e1 0 0

Specifies the slot and port number of the E1 or T1 interface.

Step 4

controller {t1 | e1 } slot /subslot /port

Example:


Router(config)# controller e1 0/0/4

Example:

Specifies the controller interface on which you want to enable IMA.

Step 5

clock source internal

Example:


Router(config-controller)# clock source internal

Example:

Sets the clock source to internal.

Step 6

ima group group-number

Example:


Router(config-controller)# ima-group 0 scrambling-payload

Example:

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 
This command automatically creates an ATM0/IMAx interface.

To add another member link, repeat Step 3 to Step 6 .

Step 7

exit

Example:


Router(config-controller)# exit

Example:

Exits the controller interface.

Step 8

interface ATM slot /subslot /IMA group-number

Example:


Router(config-if)# interface atm0/1/ima0

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.
Step 9

no ip address

Example:


Router(config-if)# no ip address

Disables the IP address configuration for the physical layer interface.

Step 10

atm bandwidth dynamic

Example:


Router(config-if)# atm bandwidth dynamic

Specifies the ATM bandwidth as dynamic.

Step 11

no atm ilmi-keepalive

Example:


Router(config-if)# no atm ilmi-keepalive

Disables the Interim Local Management Interface (ILMI) keepalive parameters.

ILMI is not supported on the router starting with Cisco IOS XE Release 3.15S.
Step 12

exit

Example:


Router(config)# exit

Exits configuration mode.

What to do next

The above configuration has one IMA shorthaul with two member links (atm0/0 and atm0/1).

Configuring Structure-Agnostic TDM over Packet (SAToP)

Follow these steps to configure SAToP on the Cisco ASR 903 Series Router:

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. controller [t1 |e1 ] slot/sublot
  4. cem-group group-number {unframed | timeslots timeslot }
  5. interface cem slot/subslo t
  6. xconnect ip_address encapsulation mpls
  7. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

controller [t1 |e1 ] slot/sublot

Example:


Router(config-controller)# controller t1 0/4

Configures the T1 or E1 interface.

Step 4

cem-group group-number {unframed | timeslots timeslot }

Example:


Router(config-if)# cem-group 4 unframed

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.

Step 5

interface cem slot/subslo t

Example:


Router(config)# interface CEM 0/4

Example:


Router(config-if)# no ip address

Example:


Router(config-if)# cem 4

Defines a CEM group.

Step 6

xconnect ip_address encapsulation mpls

Example:


Router(config-if)# xconnect 10.10.2.204 encapsulation mpls

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.

Step 7

exit

Example:


Router(config)# exit

Exits configuration mode.

What to do next


Note
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.

Configuring Circuit Emulation Service over Packet-Switched Network (CESoPSN)

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. controller [ e1 | t1 ] slot/subslot
  4. cem-group group-number timselots timeslots
  5. exit
  6. interface cem slot/subslot
  7. xconnect ip_address encapsulation mpls
  8. exit
  9. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

controller [ e1 | t1 ] slot/subslot

Example:


Router(config)# controller e1 0/0

Example:

Enters configuration mode for the E1 or T1 controller.

Step 4

cem-group group-number timselots timeslots

Example:


Router(config-controller)# cem-group 5 timeslots 1-24

Assigns channels on the T1 or E1 circuit to the circuit emulation (CEM) channel. This example uses the timeslots parameter to assign specific timeslots to the CEM channel.

Step 5

exit

Example:


Router(config-controller)# exit

Exits controller configuration.

Step 6

interface cem slot/subslot

Example:


Router(config)# interface CEM0/5

Example:


Router(config-if-cem)# cem 5

Example:

Defines a CEM channel.

Step 7

xconnect ip_address encapsulation mpls

Example:


Router(config-if)# xconnect 10.10.2.204 encapsulation mpls

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.

Step 8

exit

Example:


Router(config-if-cem)# exit

Exits the CEM interface.

Step 9

exit

Example:


Router(config)# exit

Exits configuration mode.

Configuring a Clear-Channel ATM Pseudowire

To configure the T1 interface module for clear-channel ATM, follow these steps:

SUMMARY STEPS

  1. controller { t1 } slot /subslot /port
  2. atm
  3. exit
  4. interface atm slot/subslot/port
  5. pvc vpi/vci
  6. xconnect peer-router-id vcid {encapsulation mpls | pseudowire-class name
  7. end

DETAILED STEPS

  Command or Action Purpose
Step 1

controller { t1 } slot /subslot /port

Example:


Router(config)# controller t1 0/4

Selects the T1 controller for the port you are configuring.

Note 
The slot number is always 0.
Step 2

atm

Example:


Router(config-controller)# atm

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.
Step 3

exit

Example:


Router(config-controller)# exit

Returns you to global configuration mode.

Step 4

interface atm slot/subslot/port

Example:


Router(config)# interface atm 0/3/0

Selects the ATM interface in Step 2 .

Step 5

pvc vpi/vci

Example:


Router(config-if)# pvc 0/40

Configures a PVC for the interface and assigns the PVC a VPI and VCI. Do not specify 0 for both the VPI and VCI.

Step 6

xconnect peer-router-id vcid {encapsulation mpls | pseudowire-class name

Example:


Router(config-if)# xconnect 10.10.2.204 200 encapsulation mpls

Configures a pseudowire to carry data from the clear-channel ATM interface over the MPLS network.

Step 7

end

Example:


Router(config-if)# end

Exits configuration mode.

Configuring an ATM over MPLS Pseudowire

ATM over MPLS pseudowires allow you to encapsulate and transport ATM traffic across an MPLS network. This service allows you to deliver ATM services over an existing MPLS network.

The following sections describe how to configure transportation of service using ATM over MPLS:

Configuring the Controller

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. card type {e1} slot/subslot
  4. controller { e1 } slot/subslot
  5. clock source {internal | line }
  6. ima-group group-number scrambling-payload
  7. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

card type {e1} slot/subslot

Example:


Router(config)# card type e1 0 0

Configures IMA on an E1 or T1 interface.

Step 4

controller { e1 } slot/subslot

Example:


Router(config)# controller e1 0/4

Specifies the controller interface on which you want to enable IMA.

Step 5

clock source {internal | line }

Example:


Router(config-controller)# clock source internal

Sets the clock source to internal.

Step 6

ima-group group-number scrambling-payload

Example:


Router(config-controller)# ima-group 0 scrambling-payload

If you want to configure an ATM IMA backhaul, use the ima-group command to assign the interface to an IMA group. For a T1 connection, use the no-scrambling-payload to disable ATM-IMA cell payload scrambling; for an E1 connection, use the scrambling-payload parameter to enable ATM-IMA cell payload scrambling.

The example assigns the interface to IMA group 0 and enables payload scrambling.

Step 7

exit

Example:


Router(config)# exit

Exits configuration mode.

Configuring an IMA Interface

If you want to use ATM IMA backhaul, follow these steps to configure the IMA interface.


Note
You can create a maximum of 16 IMA groups on each T1/E1 interface module.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface ATM slot / IMA group-number
  4. no ip address
  5. atm bandwidth dynamic
  6. no atm ilmi-keepalive
  7. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

interface ATM slot / IMA group-number

Example:


Router(config-controller)# interface atm0/ima0

Example:


Router(config-if)#

Specifies the slot location and port of IMA interface group. The syntax is as follows:

  • slot —The slot location of the interface module.
  • group-number —The group number of 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, you may 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. At the same, the system toggles the original IMA interface to select a different IMA group ID.
Step 4

no ip address

Example:


Router(config-if)# no ip address

Disables the IP address configuration for the physical layer interface.

Step 5

atm bandwidth dynamic

Example:


Router(config-if)# atm bandwidth dynamic

Specifies the ATM bandwidth as dynamic.

Step 6

no atm ilmi-keepalive

Example:


Router(config-if)# no atm ilmi-keepalive

Disables the ILMI keepalive parameters.

Step 7

exit

Example:


Router(config)# exit

Exits configuration mode.

What to do next

For more information about configuring IMA groups, see the Configuring ATM IMA.

Configuring the ATM over MPLS Pseudowire Interface

You can configure ATM over MPLS is several modes according to the needs of your network. Use the appropriate section according to the needs of your network. You can configure the following ATM over MPLS pseudowire types:


Note
When creating IP routes for a pseudowire configuration, build a route from the xconnect address (LDP router-id or loopback address) to the next hop IP address, such as ip route 10.10.10.2 255.255.255.255 10.2.3.4.

Configuring 1-to-1 VCC Cell Transport Pseudowire

A 1-to-1 VCC cell transport pseudowire maps one ATM virtual channel connection (VCC) to a single pseudowire. Complete these steps to configure a 1-to-1 pseudowire.


Note
Multiple 1-to-1 VCC pseudowire mapping on an interface is supported.
Mapping a Single PVC to a Pseudowire

To map a single PVC to an ATM over MPLS pseudowire, use the xconnect command at the PVC level. This configuration type uses AAL0 and AAL5 encapsulations. Complete these steps to map a single PVC to an ATM over MPLS pseudowire.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface ATM slot / IMA group-number
  4. pvc slot/subslot l2transport
  5. encapsulation aal0
  6. xconnect router_ip_address vcid encapsulation mpls
  7. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface ATM slot / IMA group-number

Example:

Router(config-controller)# interface atm0/ima0

Configures the ATM IMA interface.

Step 4

pvc slot/subslot l2transport

Example:

Router(config-if-atm)# pvc 0/40 l2transport

Defines a PVC. Use the l2transport keyword to configure the PVC as a layer 2 virtual circuit.

Step 5

encapsulation aal0

Example:

Router(config-if-atm-l2trans-pvc)# encapsulation aal0

Defines the encapsulation type for the PVC. The default encapsulation type for the PVC is AAL5.

Step 6

xconnect router_ip_address vcid encapsulation mpls

Example:

Router(config-if-atm-l2trans-pvc)# xconnect 1.1.1.1 40 encapsulation mpls

Binds an attachment circuit to the ATM IMA interface to create a pseudowire. This example creates a pseudowire by binding PVC 40 to the remote peer 1.1.1.1.

Step 7

end

Example:

Router(config-if-atm-l2trans-pvp-xconn)# end

Exits configuration mode.

Configuring N-to-1 VCC Cell Transport Pseudowire

An N-to-1 VCC cell transport pseudowire maps one or more ATM virtual channel connections (VCCs) to a single pseudowire. Complete these steps to configure an N-to-1 pseudowire.

Configuring 1-to-1 VPC Cell Transport

A 1-to-1 VPC cell transport pseudowire maps one or more virtual path connections (VPCs) to a single pseudowire. While the configuration is similar to 1-to-1 VPC cell mode, this transport method uses the 1-to-1 VPC pseudowire protocol and format defined in RFCs 4717 and 4446. Complete these steps to configure a 1-to-1 VPC pseudowire.


Note
Multiple 1-to-1 VCC pseudowire mapping on an interface is supported.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface ATM slot / IMA group-number
  4. atm pvp vpi l2transport
  5. xconnect peer-router-id vcid {encapsulation mpls
  6. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface ATM slot / IMA group-number

Example:

Router(config-controller)# interface atm0/ima0
Example:

Router(config-if)#
Example:

Configures the ATM IMA interface.

Step 4

atm pvp vpi l2transport

Example:

Router(config-if-atm)# atm pvp 10 l2transport
Example:

Router(config-if-atm-l2trans-pvp)#

Maps a PVP to a pseudowire.

Step 5

xconnect peer-router-id vcid {encapsulation mpls

Example:

Router(config-if-atm-l2trans-pvp)# xconnect 10.10.10.2 305 encapsulation mpls
Example:

Router(config-if-atm-l2trans-pvp-xconn)#

Binds an attachment circuit to the ATM IMA interface to create a pseudowire. This example creates a pseudowire by binding the ATM circuit 305 to the remote peer 30.30.30.2.

Step 6

end

Example:

Router(config-if-atm-l2trans-pvp-xconn)# end
Example:

Exits the configuration mode.

Configuring ATM AAL5 SDU VCC Transport

An ATM AAL5 SDU VCC transport pseudowire maps a single ATM PVC to another ATM PVC. Follow these steps to configure an ATM AAL5 SDU VCC transport pseudowire.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface ATM slot / IMA group-number
  4. atm pvp vpi l2transport
  5. encapsulation aal5
  6. xconnect peer-router-id vcid encapsulation mpls
  7. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface ATM slot / IMA group-number

Example:

Router(config-controller)# interface atm0/ima0
Example:

Router(config-if)#
Example:
Example:

Configures the ATM IMA interface.

Step 4

atm pvp vpi l2transport

Example:

Router(config-if)# pvc 0/12 l2transport
Example:

Router(config-if-atm-l2trans-pvc)#

Configures a PVC and specifies a VCI or VPI.

Step 5

encapsulation aal5

Example:

Router(config-if-atm-l2trans-pvc)# encapsulation aal5

Sets the PVC encapsulation type to AAL5.

Note 
You must use the AAL5 encapsulation for this transport type.
Step 6

xconnect peer-router-id vcid encapsulation mpls

Example:

Router(config-if-atm-l2trans-pvc)# xconnect 10.10.10.2 125 encapsulation mpls

Binds an attachment circuit to the ATM IMA interface to create a pseudowire. This example creates a pseudowire by binding the ATM circuit 125 to the remote peer 25.25.25.25.

Step 7

exit

Example:

Router(config)# exit

Exits configuration mode.

Configuring a Port Mode Pseudowire

A port mode pseudowire allows you to map an entire ATM interface to a single pseudowire connection.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface ATM slot / IMA group-number
  4. xconnect peer-router-id vcid encapsulation mpls
  5. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface ATM slot / IMA group-number

Example:

Router(config-controller)# interface atm0/ima0
Example:

Router(config-if)#
Example:
Example:

Configures the ATM interface.

Step 4

xconnect peer-router-id vcid encapsulation mpls

Example:

Router(config-if-atm-l2trans-pvc)# xconnect 10.10.10.2 125 encapsulation mpls

Binds an attachment circuit to the ATM IMA interface to create a pseudowire. This example creates a pseudowire by binding the ATM circuit 125 to the remote peer 10.10.10.2.

Step 5

exit

Example:

Router(config)# exit

Exits configuration mode.

Optional Configurations

You can apply the following optional configurations to a pseudowire link.

Configuring Cell Packing

Cell packing allows you to improve the efficiency of ATM-to-MPLS conversion by packing multiple ATM cells into a single MPLS packet. Follow these steps to configure cell packing.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface ATM slot / IMA group-number
  4. atm mcpt-timers timer1 timer2 timer3
  5. atm pvp vpi l2transport
  6. encapsulation aal5
  7. cell-packing maxcells mcpt-timer timer-number
  8. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:

Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3

interface ATM slot / IMA group-number

Example:

Router(config-controller)# interface atm0/ima0
Example:

Router(config-if)#

Configures the ATM interface.

Step 4

atm mcpt-timers timer1 timer2 timer3

Example:

Router(config-if)# atm mcpt-timers 1000 2000 3000

Defines the three Maximum Cell Packing Timeout (MCPT) timers under an ATM interface. The three independent MCPT timers specify a wait time before forwarding a packet.

Step 5

atm pvp vpi l2transport

Example:

Router(config-if)# pvc 0/12 l2transport
Example:

Router(config-if-atm-l2trans-pvc)#

Configures a PVC and specifies a VCI or VPI.

Step 6

encapsulation aal5

Example:

Router(config-if-atm-l2trans-pvc)# encapsulation aal5

Sets the PVC encapsulation type to AAL5.

Note 
You must use the AAL5 encapsulation for this transport type.
Step 7

cell-packing maxcells mcpt-timer timer-number

Example:

Router(config-if-atm-l2trans-pvc)# cell-packing 20 mcpt-timer 3

Specifies the maximum number of cells in PW cell pack and the cell packing timer. This example specifies 20 cells per pack and the third MCPT timer.

Step 8

end

Example:

Router(config-if-atm-l2trans-pvc)# end

Exits the configuration mode.

Configuring an Ethernet over MPLS Pseudowire

Ethernet over MPLS PWs allow you to transport Ethernet traffic over an existing MPLS network. The router supports EoMPLS pseudowires on EVC interfaces.

For more information about Ethernet over MPLS Pseudowires, see Transportation of Service Using Ethernet over MPLS.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. interface interface-id
  4. service instance number ethernet [name ]
  5. encapsulation {default | dot1q | priority-tagged | untagged }
  6. xconnect peer-ip-address vc-id {encapsulation {l2tpv3 [manual ] | mpls [manual ]} | pw-class pw-class-name }[pw-class pw-class-name ] [sequencing {transmit | receive | both }]
  7. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

interface interface-id

Example:


Router(config)# interface gigabitethernet 0/0/4

Specifies the port on which to create the pseudowire and enters interface configuration mode. Valid interfaces are physical Ethernet ports.

Step 4

service instance number ethernet [name ]

Example:


Router(config-if)# service instance 2 ethernet

Configure an EFP (service instance) and enter service instance configuration) mode.

  • The number is the EFP identifier, an integer from 1 to 4000.
  • (Optional) ethernet name is the name of a previously configured EVC. You do not need to use an EVC name in a service instance.
Note 
You can use service instance settings such as encapsulation, dot1q, and rewrite to configure tagging properties for a specific traffic flow within a given pseudowire session. For more information, see http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/cether/configuration/xe-3s/asr903/ce-xe-3s-asr903-book/ce-evc.html
Step 5

encapsulation {default | dot1q | priority-tagged | untagged }

Example:


Router(config-if-srv)# encapsulation dot1q 2

Configure encapsulation type for the service instance.

  • default —Configure to match all unmatched packets.
  • dot1q —Configure 802.1Q encapsulation.
  • priority-tagged —Specify priority-tagged frames, VLAN-ID 0 and CoS value of 0 to 7.
  • untagged —Map to untagged VLANs. Only one EFP per port can have untagged encapsulation.
Step 6

xconnect peer-ip-address vc-id {encapsulation {l2tpv3 [manual ] | mpls [manual ]} | pw-class pw-class-name }[pw-class pw-class-name ] [sequencing {transmit | receive | both }]

Example:


Router (config-if-srv)# xconnect 10.1.1.2 101 encapsulation mpls

Binds the Ethernet port interface to an attachment circuit to create a pseudowire. This example uses virtual circuit (VC) 101 to uniquely identify the PW. Ensure that the remote VLAN is configured with the same VC.

Note 
When creating IP routes for a pseudowire configuration, we recommend that you build a route from the xconnect address (LDP router-id or loopback address) to the next hop IP address, such as ip route 10.10.10.2 255.255.255.255 10.2.3.4 .
Step 7

exit

Example:


Router(config)# exit

Exits configuration mode.

Configuring Pseudowire Redundancy

A backup peer provides a redundant pseudowire (PW) connection in the case that the primary PW loses connection; if the primary PW goes down, the Cisco ASR 903 Series Router diverts traffic to the backup PW. This feature provides the ability to recover from a failure of either the remote PE router or the link between the PE router and CE router.

Pseudowire Redundancy shows an example of pseudowire redundancy.

Figure 3. Pseudowire Redundancy

Note
You must configure the backup pseudowire to connect to a router that is different from the primary pseudowire.

Follow these steps to configure a backup peer:

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. pseudowire-class [pw-class-name ]
  4. encapsulation mpls
  5. interface serial slot /subslot /port
  6. backup delay enable-delay {disable-delay | never }
  7. xconnect router-id encapsulation mpls
  8. backup peer peer-router-ip-address vcid [pw-class pw-class name ]
  9. exit

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.
Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

pseudowire-class [pw-class-name ]

Example:


Router(config)# pseudowire-class mpls

Specify the name of a Layer 2 pseudowire class and enter pseudowire class configuration mode.

Step 4

encapsulation mpls

Example:


Router(config-pw-class)# encapsulation mpls

Specifies MPLS encapsulation.

Step 5

interface serial slot /subslot /port

Example:


Router(config)# interface serial0/0

Enters configuration mode for the serial interface.

Note 
The slot number is always 0.
Step 6

backup delay enable-delay {disable-delay | never }

Example:


Router(config)# backup delay 0 10

Configures the backup delay parameters.

Where:

  • enable-delay —Time before the backup PW takes over for the primary PW.
  • disable-delay —Time before the restored primary PW takes over for the backup PW.
  • never —Disables switching from the backup PW to the primary PW.
Step 7

xconnect router-id encapsulation mpls

Example:


Router(config-if)# xconnect 10.10.10.2 101 encapsulation mpls

Binds the Ethernet port interface to an attachment circuit to create a pseudowire.

Step 8

backup peer peer-router-ip-address vcid [pw-class pw-class name ]

Example:


Router(config)# backup peer 10.10.10.1 104 pw-class pw1

Defines the address and VC of the backup peer.

Step 9

exit

Example:


Router(config)# exit

Exits configuration mode.

Pseudowire Redundancy with Uni-directional Active-Active

Pseudowire redundancy with uni-directional active-active feature configuration allows, pseudowires (PW) on both the working and protect circuits to remain in UP state to allow traffic to flow from the upstream. The aps l2vpn-state detach command and redundancy all-active replicate command is introduced to configure uni-directional active-active pseudowire redundancy.

In pseudowire redundancy Active-Standby mode, the designation of the active and standby pseudowires is decided either by the endpoint PE routers or by the remote PE routers when configured with MR-APS. The active and standby routers communicate via Protect Group Protocol (PGP) and synchronize their states. The PEs are connected to a Base Station Controller (BSC). APS state of the router is communicated to the Layer2 VPN, and is therby coupled with the pseudowire status .

Figure 4. Pseudowire Redundancy with MR-APS

BSC monitors the status of the incoming signal from the working and protect routers. In the event of a swithover at the BSC, the BSC fails to inform the PE routers, hence causing traffic drops.

With pseudowire redundancy Active-Active configuration, the traffic from the upstream is replicated and transmitted over both the primary and backup pseudowires. PE routers forwards the received traffic to the working and protect circuits. The BSC receives the same traffic on both the circuits and selects the better Rx link, ensuring the traffic is not dropped.

Figure 5. Pseudowire Redundancy with Uni-directional Active-Active

Note

If teh ASR 900 router is configured with the aps l2vpn-state detach command but, the ASR 901 router is not enabled with redundancy all-active replicate command, the protect PW is active after APS switchover. On the ASR 901 router, the PW state is UP and the data path status displays standby towards protect node. On an APS switchover on the ASR 900 router, the status is not communicated to ASR 901 router, and the VC data path state towards the protect node remains in the standby state.

Restrictions

The following restrictions apply on the router:

  • If the aps l2vpn-state detach command is enabled on the ASR 900 router, but the redundancy all-active replicate command not enabled on the ASR 901 router, the pseudowire status on the router displays UP, and the data path status for the protect node state displays Standby.

  • After APS switchover on the ASR 900 router, the status is not communicated to ASR 901 router, and the virtual circuit data path state towards the protect node remains in the Standby state.

  • The aps l2vpn-state detach command takes effect after a controller shutdown command, followed by a no shutown command is performed. Alternately, the command can be configured when the controller is in shut state.

  • The status peer topology dual-homed command in pseudowire-class configuration mode should not be configured on the ASR 900 router, irrespective of unidirectional or bidirectional mode. The command must be configured on the ASR 901 router.

  • Traffic outages from the BSC to the BTS on PGP and ICRM failures at the working Active node, is same as the configured hold time.


    Note

    APS switchover may be observed on the protect node, when PGP failure occurs on the working Active node.

  • Convergence may be observed on performing a power cycle on the Active (whether on the protect or working) node. The observed convergence is same as the configured hold time.

Configuring Pseudowire Redundancy Active-Active— Protocol Based


encapsulation mpls
status peer topology dual-homed

controller E1 0/1
framing unframed
cem-group 8 unframed

Configuring the Working Controller for MR-APS with Pseudowire Redundancy Active-Active

The following configuration shows pseudowire redundancy active-active for MR-APS working controller: 


controller sonet 0/1/0
aps group 2
aps adm
aps working 1
aps timers 1 3
aps l2vpn-state detach
aps hspw-icrm-grp 1

Configuring the Protect Controller for MR-APS with Pseudowire Redundancy Active-Active

Following example shows pseudowire redundancy active-active on MR-APS protect controller: 


controller sonet 0/1/0
aps group 2
aps adm
aps unidirectional
aps protect 10 10.10.10.1
aps timers 1 3
aps l2vpn-state detach
aps hspw-icrm-grp 1

Verifying the Interface Configuration

You can use the following commands to verify your pseudowire configuration:

  • show cem circuit —Displays information about the circuit state, administrative state, the CEM ID of the circuit, and the interface on which it is configured. If xconnect is configured under the circuit, the command output also includes information about the attached circuit. 

Router# show cem circuit
 ?
 
  <0-504>    CEM ID
  detail     Detailed information of cem ckt(s)
  interface  CEM Interface
  summary    Display summary of CEM ckts
  |          Output modifiers
Router# show cem circuit
 
CEM Int.       ID   Line      Admin     Circuit         AC  
-------------------------------------------------------------- 
CEM0/1/0       1    UP        UP        ACTIVE          --/--
CEM0/1/0       2    UP        UP        ACTIVE          --/--
CEM0/1/0       3    UP        UP        ACTIVE          --/--
CEM0/1/0       4    UP        UP        ACTIVE          --/--
CEM0/1/0       5    UP        UP        ACTIVE          --/--
  • show cem circuit —D isplays the detailed information about that particular circuit. 

Router# show cem circuit 1
 
CEM0/1/0, ID: 1, Line State: UP, Admin State: UP, Ckt State: ACTIVE
Idle Pattern: 0xFF, Idle cas: 0x8, Dummy Pattern: 0xFF
Dejitter: 5, Payload Size: 40
Framing: Framed, (DS0 channels: 1-5)
Channel speed: 56
CEM Defects Set
Excessive Pkt Loss RatePacket Loss 
Signalling: No CAS
Ingress Pkts:    25929                Dropped:             0                   
Egress Pkts:     0                    Dropped:             0                   
CEM Counter Details
Input Errors:    0                    Output Errors:       0                   
Pkts Missing:    25927                Pkts Reordered:      0                   
Misorder Drops:  0                    JitterBuf Underrun:  1                   
Error Sec:       26                   Severly Errored Sec: 26                  
Unavailable Sec: 5                    Failure Counts:      1                   
Pkts Malformed:  0
  • show cem circuit summary —Displays the number of circuits which are up or down per interface basis. 

Router# show cem circuit summary
 
CEM Int.       Total Active  Inactive
--------------------------------------
CEM0/1/0       5     5       0
  • show running configuration —The show running configuration command shows detail on each CEM group.

Configuration Examples

The following sections contain sample pseudowire configurations.

Example: CEM Configuration

The following example shows how to add a T1 interface to a CEM group as a part of a SAToP pseudowire configuration. For more information about how to configure pseudowires, see Configuring Pseudowire


Note
This section displays a partial configuration intended to demonstrate a specific feature. 

controller T1 0/0/0
 framing unframed
 clock source internal
 linecode b8zs
 cablelength short 110
 cem-group 0 unframed
interface CEM0/0/0
 no ip address
 cem 0
  xconnect 18.1.1.1 1000 encapsulation mpls

Example: BGP PIC with TDM Configuration

CEM Configuration


pseudowire-class pseudowire1
encapsulation mpls
control-word
no status control-plane route-watch
!
controller SONET 0/2/3
description connected to CE2 SONET 4/0/0
framing sdh
clock source line
aug mapping au-4
!
au-4 1 tug-3 1
  mode c-12
  tug-2 1 e1 1 cem-group 1101 unframed
  tug-2 1 e1 1 framing unframed
  tug-2 1 e1 2 cem-group 1201 timeslots 1-10 
 !
au-4 1 tug-3 2
  mode c-12 
  tug-2 5 e1 1 cem-group 1119 unframed
  tug-2 5 e1 1 framing unframed 
  tug-2 5 e1 2 cem-group 1244 timeslots 11-20 
 !
au-4 1 tug-3 3
  mode c-12 
  tug-2 5 e1 3 cem-group 1130 unframed
  tug-2 5 e1 3 framing unframed
  tug-2 7 e1 3 cem-group 1290 timeslots 21-30
!
interface CEM0/2/3
no ip address
cem 1101
  xconnect 17.1.1.1 1101 encapsulation mpls pw-class pseudowire1 
 !
cem 1201
  xconnect 17.1.1.1 1201 encapsulation mpls pw-class pseudowire1 
 !
cem 1119
  xconnect 17.1.1.1 1119 encapsulation mpls pw-class pseudowire1 
 !
cem 1244
  xconnect 17.1.1.1 1244 encapsulation mpls pw-class pseudowire1 
 !
cem 1130
  xconnect 17.1.1.1 1130 encapsulation mpls pw-class pseudowire1 
 !
cem 1290
  xconnect 17.1.1.1 1290 encapsulation mpls pw-class pseudowire1

BGP PIC Configuration


cef table output-chain build favor convergence-speed
!
router bgp 1
bgp log-neighbor-changes
bgp graceful-restart
neighbor 18.2.2.2 remote-as 1
neighbor 18.2.2.2 update-source Loopback0
neighbor 18.3.3.3 remote-as 1
neighbor 18.3.3.3 update-source Loopback0
!
address-family ipv4
  bgp additional-paths receive
  bgp additional-paths install
  bgp nexthop trigger delay 0
  network 17.5.5.5 mask 255.255.255.255
  neighbor 18.2.2.2 activate
  neighbor 18.2.2.2 send-community both
  neighbor 18.2.2.2 send-label
  neighbor 18.3.3.3 activate
  neighbor 18.3.3.3 send-community both
  neighbor 18.3.3.3 send-label
exit-address-family

Example: BGP PIC with TDM-PW Configuration

This section lists the configuration examples for BGP PIC with TDM and TDM–Pseudowire.

The below configuration example is for BGP PIC with TDM: 


router bgp 1
neighbor 18.2.2.2 remote-as 1
neighbor 18.2.2.2 update-source Loopback0
neighbor 18.3.3.3 remote-as 1
neighbor 18.3.3.3 update-source Loopback0
!
address-family ipv4
  bgp additional-paths receive
  bgp additional-paths install
  bgp nexthop trigger delay 6
  neighbor 18.2.2.2 activate
  neighbor 18.2.2.2 send-community both
  neighbor 18.2.2.2 send-label
  neighbor 18.3.3.3 activate
  neighbor 18.3.3.3 send-community both
  neighbor 18.3.3.3 send-label
  neighbor 26.1.1.2 activate
exit-address-family
!
address-family vpnv4
  bgp nexthop trigger delay 7
  neighbor 18.2.2.2 activate
  neighbor 18.2.2.2 send-community extended
  neighbor 18.3.3.3 activate
  neighbor 18.3.3.3 send-community extended
exit-address-family

The below configuration example is for BGP PIC with TDM PW: 


pseudowire-class pseudowire1
encapsulation mpls
control-word
no status control-plane route-watch
status peer topology dual-homed
!
Interface CEM0/0/0
cem 1
   xconnect 17.1.1.1 4101 encapsulation mpls pw-class pseudowire1

Example: ATM IMA Configuration

The following example shows how to add a T1/E1 interface to an ATM IMA group as a part of an ATM over MPLS pseudowire configuration. For more information about how to configure pseudowires, see Configuring Pseudowire


Note
This section displays a partial configuration intended to demonstrate a specific feature. 

controller t1 4/0/0
 ima-group 0
 clock source line
interface atm4/0/ima0
 pvc 1/33 l2transport
  encapsulation aal0
  xconnect 1.1.1.1 33 encapsulation mpls

Example: ATM over MPLS

The following sections contain sample ATM over MPLS configurations:

Cell Packing Configuration Examples

The following sections contain sample ATM over MPLS configuration using Cell Relay:

VC Mode
CE 1 Configuration

interface Gig4/3/0
no negotiation auto
load-interval 30
interface Gig4/3/0
ip address 20.1.1.1 255.255.255.0
interface ATM4/2/4
no shut
exit
!
interface ATM4/2/4.10 point
ip address 50.1.1.1 255.255.255.0
pvc 20/101
encapsulation aal5snap
!
ip route 30.1.1.2 255.255.255.255 50.1.1.2
CE 2 Configuration

interface Gig8/8
no negotiation auto
load-interval 30
interface Gig8/8
ip address 30.1.1.1 255.255.255.0
interface ATM6/2/1
no shut
!
interface ATM6/2/1.10 point
ip address 50.1.1.2 255.255.255.0
pvc 20/101
encapsulation aal5snap
!
ip route 20.1.1.2 255.255.255.255 50.1.1.1
PE 1 Configuration

interface Loopback0
ip address 192.168.37.3 255.255.255.255
!
interface ATM0/0/0
no shut
!
interface ATM0/0/0
atm mcpt-timers 150 1000 4095
interface ATM0/0/0.10 point
pvc 20/101 l2transport
encapsulation aal0
cell-packing 20 mcpt-timer 1
xconnect 192.168.37.2 100 encapsulation mpls
!
interface Gig0/3/0
no shut
ip address 40.1.1.1 255.255.0.0
mpls ip
!
mpls ip
mpls label protocol ldp
mpls ldp router-id Loopback0 force
mpls ldp graceful-restart
router ospf 1
network 40.1.0.0 0.0.255.255 area 1
network 192.168.37.0 0.0.0.255 area 1
nsf
PE 2 Configuration

interface Loopback0
ip address 192.168.37.2 255.255.255.255
!
interface ATM9/3/1
no shut
!
interface ATM9/3/1
atm mcpt-timers 150 1000 4095
interface ATM9/3/1.10 point
pvc 20/101 l2transport
encapsulation aal0
cell-packing 20 mcpt-timer 1
xconnect 192.168.37.3 100 encapsulation mpls
!
interface Gig6/2
no shut
ip address 40.1.1.2 255.255.0.0
mpls ip
!
mpls ip
mpls label protocol ldp
mpls ldp router-id Loopback0 force
mpls ldp graceful-restart
router ospf 1
network 40.1.0.0 0.0.255.255 area 1
network 192.168.37.0 0.0.0.255 area 1
nsf
VP Mode
CE 1 Configuration

interface Gig4/3/0
no negotiation auto
load-interval 30
interface Gig4/3/0
ip address 20.1.1.1 255.255.255.0
interface ATM4/2/4
!
interface ATM4/2/4.10 point
ip address 50.1.1.1 255.255.255.0
pvc 20/101
encapsulation aal5snap
!
ip route 30.1.1.2 255.255.255.255 50.1.1.2
CE 2 Configuration

!
interface Gig8/8
no negotiation auto
load-interval 30
interface Gig8/8
ip address 30.1.1.1 255.255.255.0
interface ATM6/2/1
no shut
!
interface ATM6/2/1.10 point
ip address 50.1.1.2 255.255.255.0
pvc 20/101
encapsulation aal5snap
!
ip route 20.1.1.2 255.255.255.255 50.1.1.1
PE 1 Configuration

interface Loopback0
ip address 192.168.37.3 255.255.255.255
!
interface ATM0/0/0
no shut
!
interface ATM0/0/0
atm mcpt-timers 150 1000 4095
interface ATM0/0/0.50 multipoint
atm pvp 20 l2transport
cell-packing 10 mcpt-timer 1
xconnect 192.168.37.2 100 encapsulation mpls
!
interface Gig0/3/0
no shut
ip address 40.1.1.1 255.255.0.0
mpls ip
!
mpls ip
mpls label protocol ldp
mpls ldp router-id Loopback0 force
mpls ldp graceful-restart
router ospf 1
network 40.1.0.0 0.0.255.255 area 1
network 192.168.37.0 0.0.0.255 area 1
nsf
PE 2 Configuration

!
interface Loopback0
ip address 192.168.37.2 255.255.255.255
!
interface ATM9/3/1
no shut
!
interface ATM9/3/1
atm mcpt-timers 150 1000 4095
interface ATM9/3/1.50 multipoint
atm pvp 20 l2transport
cell-packing 10 mcpt-timer 1
xconnect 192.168.37.3 100 encapsulation mpls
!
interface Gig6/2
no shut
ip address 40.1.1.2 255.255.0.0
mpls ip
!
mpls ip
mpls label protocol ldp
mpls ldp router-id Loopback0 force
mpls ldp graceful-restart
router ospf 1
network 40.1.0.0 0.0.255.255 area 1
network 192.168.37.0 0.0.0.255 area 1
nsf

Cell Relay Configuration Examples

The following sections contain sample ATM over MPLS configuration using Cell Relay:

VC Mode
CE 1 Configuration

!
interface gigabitethernet4/3/0
no negotiation auto
load-interval 30
interface gigabitethernet4/3/0
ip address 20.1.1.1 255.255.255.0
!
interface ATM4/2/4
!
interface ATM4/2/4.10 point
ip address 50.1.1.1 255.255.255.0
pvc 20/101
encapsulation aal5snap
!
ip route 30.1.1.2 255.255.255.255 50.1.1.2
!
CE 2 Configuration

interface gigabitethernet8/8
no negotiation auto
load-interval 30
interface gigabitethernet8/8
ip address 30.1.1.1 255.255.255.0
interface ATM6/2/1
!
interface ATM6/2/1.10 point
ip address 50.1.1.2 255.255.255.0
pvc 20/101
encapsulation aal5snap
!
ip route 20.1.1.2 255.255.255.255 50.1.1.1
PE 1 Configuration

!
interface Loopback0
ip address 192.168.37.3 255.255.255.255
!
interface ATM0/0/0
!
interface ATM0/0/0.10 point
pvc 20/101 l2transport
encapsulation aal0
xconnect 192.168.37.2 100 encapsulation mpls
!
interface gigabitethernet0/3/0
ip address 40.1.1.1 255.255.0.0
mpls ip
!
mpls ip
mpls label protocol ldp
mpls ldp router-id Loopback0 force
mpls ldp graceful-restart
router ospf 1
network 40.1.0.0 0.0.255.255 area 1
network 192.168.37.0 0.0.0.255 area 1
nsf
PE 2 Configuration

!
interface Loopback0
ip address 192.168.37.2 255.255.255.255
!
interface ATM9/3/1
!
interface ATM9/3/1.10 point
pvc 20/101 l2transport
encapsulation aal0
xconnect 192.168.37.3 100 encapsulation mpls
!
interface gigabitethernet6/2
ip address 40.1.1.2 255.255.0.0
mpls ip
!
mpls ip
mpls label protocol ldp
mpls ldp router-id Loopback0 force
mpls ldp graceful-restart
router ospf 1
network 40.1.0.0 0.0.255.255 area 1
network 192.168.37.0 0.0.0.255 area 1
nsf
VP Mode
CE 1 Configuration

!
interface gigabitethernet4/3/0
no negotiation auto
load-interval 30
interface gigabitethernet4/3/0
ip address 20.1.1.1 255.255.255.0
!
interface ATM4/2/4
!
interface ATM4/2/4.10 point
ip address 50.1.1.1 255.255.255.0
pvc 20/101
encapsulation aal5snap
!
ip route 30.1.1.2 255.255.255.255 50.1.1.2
CE 2 Configuration

!
interface gigabitethernet8/8
no negotiation auto
load-interval 30
interface gigabitethernet8/8
ip address 30.1.1.1 255.255.255.0
interface ATM6/2/1
!
interface ATM6/2/1.10 point
ip address 50.1.1.2 255.255.255.0
pvc 20/101
encapsulation aal5snap
!
ip route 20.1.1.2 255.255.255.255 50.1.1.1
PE 1 Configuration

interface Loopback0
ip address 192.168.37.3 255.255.255.255
!
!
interface ATM0/0/0
interface ATM0/0/0.50 multipoint
atm pvp 20 l2transport
xconnect 192.168.37.2 100 encapsulation mpls
!
interface gigabitethernet0/3/0
ip address 40.1.1.1 255.255.0.0
mpls ip
!
mpls ip
mpls label protocol ldp
mpls ldp router-id Loopback0 force
mpls ldp graceful-restart
router ospf 1
network 40.1.0.0 0.0.255.255 area 1
network 192.168.37.0 0.0.0.255 area 1
nsf
PE 2 Configuration

interface Loopback0
ip address 192.168.37.2 255.255.255.255
!
!
interface ATM9/3/1
interface ATM9/3/1.50 multipoint
atm pvp 20 l2transport
xconnect 192.168.37.3 100 encapsulation mpls
!
interface gigabitethernet6/2
ip address 40.1.1.2 255.255.0.0
mpls ip
!
mpls ip
mpls label protocol ldp
mpls ldp router-id Loopback0 force
mpls ldp graceful-restart
router ospf 1
network 40.1.0.0 0.0.255.255 area 1
network 192.168.37.0 0.0.0.255 area 1
nsf

Example: Ethernet over MPLS

PE 1 Configuration


! 
mpls label range 16 12000 static 12001 16000
mpls label protocol ldp
mpls ldp neighbor 10.1.1.1 targeted ldp
mpls ldp graceful-restart
multilink bundle-name authenticated
!
! 
! 
!
redundancy
 mode sso
! 
!
!
ip tftp source-interface GigabitEthernet0
! 
! 
interface Loopback0
 ip address 10.5.5.5 255.255.255.255
!
interface GigabitEthernet0/0/4
 no ip address
 negotiation auto
!
 service instance 2 ethernet
  encapsulation dot1q 2
  xconnect 10.1.1.1 1001 encapsulation mpls
 !
 service instance 3 ethernet
  encapsulation dot1q 3
  xconnect 10.1.1.1 1002 encapsulation mpls
 !
!
interface GigabitEthernet0/0/5
 ip address 172.7.7.77 255.0.0.0
 negotiation auto
 mpls ip
 mpls label protocol ldp
!
router ospf 1
 router-id 5.5.5.5
 network 5.5.5.5 0.0.0.0 area 0
 network 172.0.0.0 0.255.255.255 area 0
 network 10.33.33.33 0.0.0.0 area 0
 network 192.0.0.0 0.255.255.255 area 0
!

PE 2 Configuration


! 
mpls label range 16 12000 static 12001 16000
mpls label protocol ldp
mpls ldp neighbor 10.5.5.5 targeted ldp
mpls ldp graceful-restart
multilink bundle-name authenticated
!
!
redundancy
 mode sso
! 
!
!
ip tftp source-interface GigabitEthernet0
! 
! 
interface Loopback0
 ip address 10.1.1.1 255.255.255.255
!
interface GigabitEthernet0/0/4
 no ip address
 negotiation auto
!
 service instance 2 ethernet
  encapsulation dot1q 2
  xconnect 10.5.5.5 1001 encapsulation mpls
 !
 service instance 3 ethernet
  encapsulation dot1q 3
  xconnect 10.5.5.5 1002 encapsulation mpls
 !
!
interface GigabitEthernet0/0/5
 ip address 172.7.7.7 255.0.0.0
 negotiation auto
 mpls ip
 mpls label protocol ldp
!
router ospf 1
 router-id 10.1.1.1
 network 10.1.1.1 0.0.0.0 area 0
 network 172.0.0.0 0.255.255.255 area 0
 network 10.33.33.33 0.0.0.0 area 0
 network 192.0.0.0 0.255.255.255 area 0
!