Inter-Chassis Backup (ICB) spoke SDPs are supported for use with Cpipe services in an MC-APS configuration. ICB improves switch times, provides additional protection in case of network failures, and reduces packet loss when an active endpoint is switched from a failed MC-APS node to the protection node. Figure: MC-APS with Pseudowire Redundancy and ICB shows an MC-APS group with pseudowire redundancy and ICB protection.
If the active link on the access side fails, an MC-APS switchover is triggered and a pseudowire switchover occurs. A failure on the network side triggers a pseudowire switchover but not an MC-APS switchover. For detailed information on pseudowire redundancy with ICB protection, refer to the 7705 SAR Services Guide, ‟PW Redundancy and Inter-Chassis Backup”.