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20-7
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 20 Configuring L2 Virtual Private Networks
NSF and SSO—L2VPN
Checkpointing AToM Information
Checkpointing is a function that copies state information from the active RP to the backup RP, thereby
ensuring that the backup RP has the latest information. If the active RP fails, the backup RP can take
over.
For the L2VPN NSF feature, the checkpointing function copies the active RP's information bindings to
the backup RP. The active RP sends updates to the backup RP when information is modified.
To display checkpointing data, issue the show acircuit checkpoint command on the active and backup
RPs. The active and backup RPs have identical copies of the information.
Checkpointing Troubleshooting Tips
To help troubleshoot checkpointing errors, enter the following commands:
• debug acircuit checkpoint command—To enable checkpointing debug messages for ACs.
• debug mpls l2transport checkpoint command—To enable checkpointing debug messages for
ATo M.
• show acircuit checkpoint command—To display the AC checkpoint information.
• show mpls l2transport checkpoint command—To display if checkpointing is allowed, the quantity
of AToM VCs that were bulk-synced (on the active RP), and the quantity of AToM VCs that have
checkpoint data (on the standby RP).
• show mpls l2transport vc detail command—To display details of VC checkpointed information.
The NSF/SSO - L2VPN feature is described in the following topics:
• Prerequisites for NSF/SSO - L2VPN, page 20-7
• Restrictions for NSF/SSO - L2VPN, page 20-8
• Configuring NSF/SSO - L2VPN, page 20-8
• Configuration Examples of NSF/SSO—Layer 2 VPN, page 20-9
Prerequisites for NSF/SSO - L2VPN
This section lists the following prerequisites for the feature:
• Neighbor Routers in the MPLS HA Environment
• Stateful Switchover
• Nonstop Forwarding for Routing Protocols
Neighbor Routers in the MPLS HA Environment
Cisco 10000 routers must be used as the neighboring device.
Stateful Switchover
For information on this topic, see the Stateful Switchover section in the NSF/SSO: Any Transport over
MPLS and Graceful Restart document at:
http://www.cisco.com/en/US/docs/ios/12_2s/feature/guide/fsatomha.html#wp1098167