Debug Msdp; Msdp With Anycast Rp - Dell Force10 C150 Configuration Manual

Debug MSDP

Task
Display the information exchanged between peers.
Figure 28-17. Debugging MSDP
R1_E600(conf)#do debug ip msdp
All MSDP debugging has been turned on
R1_E600(conf)#03:16:08 : MSDP-0: Peer 192.168.0.3,
03:16:09 : MSDP-0: Peer 192.168.0.3,
03:16:27 : MSDP-0: Peer 192.168.0.3,
03:16:38 : MSDP-0: Peer 192.168.0.3,
03:16:39 : MSDP-0: Peer 192.168.0.3,
03:17:09 : MSDP-0: Peer 192.168.0.3,
03:17:10 : MSDP-0: Peer 192.168.0.3,
03:17:27 : MSDP-0: Peer 192.168.0.3,
Input (S,G) filter: none
Output (S,G) filter: none

MSDP with Anycast RP

Anycast RP use MSDP with PIM-SM to allow more than one active group to RP mapping.
PIM-SM allows only active group to RP mapping, which has several implications:
• traffic concentration: PIM-SM allows only one active group to RP mapping which means that all
traffic for the group must, at least initially, travel over the same part of the network. You can load
balance source registration between multiple RPs by strategically mapping groups to RPs, but this
technique is less effective as traffic increases because preemptive load balancing requires prior
knowledge of traffic distributions.
• lack of scalable register decasulation: With only a single RP per group, all joins are sent to that RP
regardless of the topological distance between the RP, sources, and receivers, and data is transmitted to
the RP until the SPT switch threshold is reached.
• slow convergence when an active RP fails: When multiple RPs are configured, there can be
considerable convergence delay involved in switching to the backup RP.
Anycast RP relieves these limitations by allowing multiple RPs per group, which can be distributed in a
topologically significant manner according to the locations of the sources and receivers.
1. All the RPs serving a given group are configured with an identical anycast address.
2. Sources then register with the topologically closest RP.
3. RPs use MSDP to peer with each other using a unique address.
632 | Multicast Source Discovery Protocol
Command Syntax
debug ip msdp
sent Keepalive msg
rcvd Keepalive msg
sent Source Active msg
sent Keepalive msg
rcvd Keepalive msg
sent Keepalive msg
rcvd Keepalive msg
sent Source Active msg
Command Mode
CONFIGURATION