Improved multicast convergence and RPT-SPT support for BGP-MVPN

Support for multicast forwarding-cache threshold is extended to rendezvous-point tree shortest-path tree (RPT-SPT) mode for BGP-MVPN. In addition, for both Rosen and next-generation MVPNs, PE routers across all sites should see the same set of multicast routes even if the configured forwarding-cache limit is exceeded. To configure a specific threshold for MVPN RPT, set one or both of the mvpn-rpt-suppress and mvpn-rpt-reuse statements at the [edit routing-instances name routing-options multicast forwarding-cache] or [edit logical system name routing-instances name routing-options multicast forwarding-cache] hierarchy level. In addition, the show multicast forwarding-cache statistics command provides information about both the general and RPT-suppression states. Likewise, a list of suppressed customer-multicast states can be seen by running the show mvpn suppressed general|mvpn-rpt inet|inet6 instance name summary command.