Configuring Multicast Non-Stop Routing

Multicast non-stop routing (NSR) provides hitless-failover support on all platforms for IPv4 multicast features.
  • Multicast NSR is not supported for IPv6 multicast.
  • When multicast NSR is turned on, unicast routing must be protected by NSR or graceful restart on all multicast VRFs.
  1. Enter global configuration mode. 
    device# configure terminal
  2. Globally enable multicast non-stop routing for all VRFs, using the ip multicast-nonstop-routing command. 
    device(config)# ip multicast-nonstop-routing

    During a hitless upgrade and switchover, the following syslog message is generated on the CLI. The message displayed depends on which version of PIM is configured.

    MCASTv4 protocol receives switchover event
Mcastv4 protocol switchover done

    In this example, PIM v4 is configured.

Parent topic: IPv4 Multicast Protocols