User's Manual

47-3

Catalyst 3750 Switch Software Configuration Guide

OL-8550-09

Chapter 47 Configuring MSDP

Configuring MSDP

Figure 47-1 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

These sections contain this configuration information:

• Default MSDP Configuration, page 47-4

• Configuring a Default MSDP Peer, page 47-4 (required)

• Caching Source-Active State, page 47-6 (optional)

• Requesting Source Information from an MSDP Peer, page 47-8 (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