The MVPN feature establishes at least one multicast distribution tree (MDT) for each multicast domain. The MDT provides the information needed to interconnect the same MVRFs that exist on the different PE routers. MVPN supports two MDT types: • Default MDT—The default MDT is a permanent channel for PIM control messages and low-bandwidth streams between all PE routers in a particular multicast domain. All multicast traffic in the default MDT is replicated to every other PE..
NSF has supported data and research on networking needs since 1986. NSF also supported the goals of the High Performance Computing and Communications (HPCC) Program, which promoted leading-edge research and science programs. The National Research and Education Network (NREN) Program, which is a subdivision of the HPCC Program, called for gigabitper- second (Gbps) networking for research and education to be in place by the mid-1990s. All these requirements, in addition to the ..
Multicast Open Shortest Path First
MOSPF is defined in RFC 1584, “Multicast Extensions to OSPF,” which is an extension to the OSPFv2 unicast routing protocol. The basic operation of MOSPF is described here: ■ MOSPF uses the group membership LSA, Type 6, which it floods throughout the originating router’s area. As with unicast OSPF, all MOSPF routers in an area must have identical linkstate databases so that every MOSPF router in an area can calculate the same SPT. ■ The SPT is calculated “on-dema..
LDP GR Mechanism for Downstream Unsolicited Mode
The LDP GR mechanism specifies protocol extensions that enable an LSR to express to an LDP peer its capability to preserve an MPLS forwarding state across the LDP control-plane component restart and the estimated time that it would take to restart the LSR to reestablish the LDP session with the peer. Afterward, when the LDP control-plane component of the LSR restarts, the restarting LSR loses its LDP session with the peers. On detecting that its LDP session with a neighbor ha..
The auto-cost reference-bandwidth command allows you to change the reference bandwidth that OSPF uses to calculate its metrics: Router5#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router5(config)#router ospf 87 Router5(config-router)#auto-cost reference-bandwidth 1000 Router5(config-router)#exit Router5(config)#end Router5# You can also adjust the OSPF cost of a single interface with the ip ospf cost configuration command: Router5#con..
