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The Pseudowire Group Switchover feature allows all pseudowires in a group to be quickly switched over to backup pseudowires. This group switchover is triggered by a single “group down” status message received from a remote peer.
Label Distribution Protocol (LDP) must be implemented on the network.
Each xconnect must have a backup pseudowire configured.
The Pseudowire Group Switchover feature is supported on Cisco IOS XE Release 3.10S and later releases. This feature is supported on Cisco ASR 903 Series routers on the following attachment circuits:
Ethernet VLAN
Asynchronous Transfer Mode (ATM)
Circuit Emulation over MPLS (CEM)
The Pseudowire Group Switchover feature allows you to reduce the switchover time from main pseudowires to backup pseudowires when a fault is encountered. The reduced switchover time is achieved by grouping Label Distribution Protocol (LDP) status messages and internal interprocess communication (IPC) messages.
When the remote peer detects an attachment circuit failure, it sends an LDP status message. When this status message is received, the designated backup pseudowires take over. Packets are then routed through the backup pseudowires.
Pseudowires can be grouped together by assigning a group ID. When an LDP status message is received by a pseudowire group, the entire group switches over, thus reducing switchover time.
 Note |
The Pseudowire Group Switchover feature is enabled by default and cannot be disabled. |
Predictive switchover allows switchovers from a main pseudowire to a backup pseudowire with a remote "standby" status, without waiting for an “up” status from the remote peer.
Predictive switchover is configured by enabling redundancy predictive mode in global configuration mode or xconnect configuration mode.
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode.
|
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
l2vpn Example: |
Enters l2vpn configuration mode. |
|
Step 4 |
redundancy predictive enabled Example: |
Enables redundancy predictive mode.
|
|
Step 5 |
end Example: |
Exits l2vpn configuration mode and returns to privileged EXEC mode. |
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode.
|
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
l2vpn xconnect context context-name Example: |
Creates an L2VPN cross-connect context and enters xconnect configuration mode. |
|
Step 4 |
redundancy predictive enabled Example: |
Enables redundancy predictive mode. |
|
Step 5 |
end Example: |
Exits xconnect configuration mode and returns to privileged EXEC mode. |
You can use show commands to view information about a pseudowire group switchover configuration.
The following example shows how to display information about Any Transport over MPLS (AToM) virtual circuits (VCs):
Device# show l2vpn atom vc destination 2.1.1.2 group remote 6
Service
Interface Dest Address VC ID Type Name Status
--------- --------------- ---------- ------ ------------------------ ----------
pw100001 2.1.1.2 1234000 p2p Et1/0.1-1001 UPThe following example shows how to display the status of the pseudowire switching point:
Device# show l2vpn atom vc destination 2.1.1.2 group remote 6 detail
pseudowire100001 is up, VC status is up PW type: Ethernet
Create time: 5d20h, last status change time: 5d20h
Last label FSM state change time: 5d20h
Destination address: 2.1.1.2 VC ID: 1234000
Output interface: Et0/0, imposed label stack {2001}
Preferred path: not configured
Default path: active
Next hop: 20.0.0.2
Member of xconnect service Et1/0.1-1001, group right
Associated member Et1/0.1 is up, status is up
Interworking type is Ethernet
Service id: 0x6d000002
Signaling protocol: LDP, peer 2.1.1.2:0 up
Targeted Hello: 10.1.1.1(LDP Id) -> 2.1.1.2, LDP is UP
Graceful restart: not configured and not enabled
Non stop routing: not configured and not enabled
PWid FEC (128), VC ID: 1234000
Status TLV support (local/remote) : enabled/supported
LDP route watch : enabled
Label/status state machine : established, LruRru
Local dataplane status received : No fault
BFD dataplane status received : Not sent
BFD peer monitor status received : No fault
Status received from access circuit : No fault
Status sent to access circuit : No fault
Status received from pseudowire i/f : No fault
Status sent to network peer : No fault
Status received from network peer : No fault
Adjacency status of remote peer : No fault
Sequencing: receive disabled, send disabled
Bindings
Parameter Local Remote
------------ ------------------------------ ------------------------------
Label 2007 2001
Group ID 0 6
Interface
MTU 1500 1500
Control word on (configured: autosense) on
PW type Ethernet Ethernet
VCCV CV type 0x12 0x12
LSPV [2], BFD/Raw [5] LSPV [2], BFD/Raw [5]
VCCV CC type 0x07 0x07
CW [1], RA [2], TTL [3] CW [1], RA [2], TTL [3]
Status TLV enabled supported
Dataplane:
SSM segment/switch IDs: 12309/4115 (used), PWID: 1
Rx Counters
106563 input transit packets, 9803650 bytes
0 drops, 0 seq err
Tx Counters
0 output transit packets, 0 bytes
0 dropsThe following example lists the active and standby segment pairs associated with each peer IP address and group identifier:
Device# show ssm group
Active Standby
IP Address Group ID Segment/Switch Segment/Switch
=========================================================================
2.1.1.2 6 8215/4115 4116/8210The following example displays the number of active and standby segment pairs associated with each peer IP address and group identifier:
Device# show ssm group 2.1.1.2 6 summary
IP Address Group ID Group Members
=============================================
2.1.1.2 6 1
The following example displays the number of pseudowires programmed in the hardware, with grouping information:
Device# show platform hardware pp active pw eompls group brief
Brief L2VPN EoMPLS Pseudo Wire Group Info
IP address Group ID Count
------------------------------------------------------
0x47474747 100695488 90Use the debug platform software atom brief command to view information about the following configurations:
Add Group
Delete From Group
Group Switchovers
Note |
We recommend that you use the debug platform software atom brief command only under Cisco Technical Assistance Center (TAC) supervision. |
Device> enable
Device# configure terminal
Device(config)# l2vpn
Device(config-l2vpn)# redundancy predictive enabled
Device(config-l2vpn)# endDevice> enable
Device# configure terminal
Device(config)# l2vpn xconnect context con1
Device(config-xconnect)# redundancy predictive enabled
Device(config-xconnect)# end| Related Topic | Document Title |
|---|---|
|
Cisco IOS commands |
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MPLS commands |
| Standard/RFC | Title |
|---|---|
|
RFC 4447 |
Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP) |
| Description | Link |
|---|---|
|
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The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
Pseudowire Group Switchover |
Cisco IOS XE Release 3.10S |
This feature allows all pseudowires in a group to be quickly switched over to backup pseudowires. This group switchover is triggered by a single “group down” status message received from a remote peer. The following commands were introduced or modified: redundancy predictive , show ssm group . |
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