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49-3

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

OL-21521-01

Chapter 49 Configuring MSDP

Configuring MSDP

Figure 49-1 MSDP Running Between RP Peers

MSDP Benefits

MSDP has these benefits:

• It breaks up the shared multicast distribution tree. You can make the shared tree local to your

domain. Your local members join the local tree, and join messages for the shared tree never need to

leave your domain.

• PIM sparse-mode domains can rely only on their own RPs, decreasing reliance on RPs in another

domain. This increases security because you can prevent your sources from being known outside

your domain.

• Domains with only receivers can receive data without globally advertising group membership.

• Global source multicast routing table state is not required, saving memory.

Configuring MSDP

• Default MSDP Configuration, page 49-4

• Configuring a Default MSDP Peer, page 49-4 (required)

• Caching Source-Active State, page 49-6 (optional)

• Requesting Source Information from an MSDP Peer, page 49-8 (optional)

• Controlling Source Information that Your Switch Originates, page 49-8 (optional)

MSDP peer

RP + MSDP peer

49885

Receiver

MSDP peer

MSDP SA

TCP connection

BGP

Source

Multicast

Peer RPF flooding

PIM sparse-mode

domain

PIM

(S,G) Join

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