To establish subscriber state the nodes must synchronize subscriber information. See the 7450 ESS, 7750 SR, 7950 XRS, and VSR Basic System Configuration Guide for multi-chassis synchronization configuration information. The operator must complete the configuration and the system must have data synchronized before the backup node may deliver downstream packets to the subscriber.
If dual homing is used with regular interfaces that run IGMP the nodes must be configured to synchronize the Layer 3 IGMP state.
The service IDs for both the wholesale VPRN and the retailer VPRN must be the same in both nodes.