SA Filtering:Input (S,G) filter: myremotefilterOutput (S,G) filter: noneR3(conf)#do clear ip msdp peer 192.168.0.1R3(conf)#do show ip msdp peerPeer Addr: 192.168.0.1Local Addr: 0.0.0.0(0) Connect Source: Lo 0State: Inactive Up/Down Time: 00:00:04Timers: KeepAlive 30 sec, Hold time 75 secSourceActive packet count (in/out): 0/0SAs learned from this peer: 0SA Filtering:Input (S,G) filter: myremotefilterOutput (S,G) filter: noneDebugging MSDPTo debug MSDP, use the following command.• Display the information exchanged between peers.CONFIGURATION modedebug ip msdpExample of the debug ip msdp CommandR1(conf)#do debug ip msdpAll MSDP debugging has been turned onR1(conf)#03:16:08 : MSDP-0: Peer 192.168.0.3, sent Keepalive msg03:16:09 : MSDP-0: Peer 192.168.0.3, rcvd Keepalive msg03:16:27 : MSDP-0: Peer 192.168.0.3, sent Source Active msg03:16:38 : MSDP-0: Peer 192.168.0.3, sent Keepalive msg03:16:39 : MSDP-0: Peer 192.168.0.3, rcvd Keepalive msg03:17:09 : MSDP-0: Peer 192.168.0.3, sent Keepalive msg03:17:10 : MSDP-0: Peer 192.168.0.3, rcvd Keepalive msg03:17:27 : MSDP-0: Peer 192.168.0.3, sent Source Active msgInput (S,G) filter: noneOutput (S,G) filter: noneMSDP with Anycast RPAnycast RP uses MSDP with PIM-SM to allow more than one active group to use RP mapping.PIM-SM allows only active groups to use RP mapping, which has several implications:• traffic concentration: PIM-SM allows only one active group to RP mapping which means that alltraffic for the group must, at least initially, travel over the same part of the network. You can loadbalance source registration between multiple RPs by strategically mapping groups to RPs, but thistechnique is less effective as traffic increases because preemptive load balancing requires priorknowledge of traffic distributions.• lack of scalable register decasulation: With only a single RP per group, all joins are sent to that RPregardless of the topological distance between the RP, sources, and receivers, and data is transmittedto the RP until the SPT switch threshold is reached.• slow convergence when an active RP fails: When you configure multiple RPs, there can beconsiderable convergence delay involved in switching to the backup RP.570 Multicast Source Discovery Protocol (MSDP)
