3Com Switch 8800 Advanced Software V5 Configuration Guide

MSDP Configuration Task List 615
from Source encapsulated in the SA message. When the SA message reaches RP 2,
RP 2 decapsulates the message.
4 Receivers receive the multicast data along the RPT and directly join the SPT rooted
at the multicast source. In this example, RP 2 forwards the multicast data down
the RPT. When Receiver receives the multicast data from Source, it directly joins
the SPT rooted at Source.
The significance of Anycast RP is as follows:
■ Optimal RP path: A multicast source registers with the nearest RP so that an
SPT with the optimal path is built; a receiver joins the nearest RP so that an RPT
with the optimal path is built.
■ Load balancing between RPs: Each RP just needs to maintain part of the
source/group information within the PIM-SM domain and forward part of the
multicast data, thus achieving load balancing between different RPs.
■ Redundancy backup between RPs: When an RP fails, the multicast source
previously registered on it or the receivers previous joined it will register with or
join another nearest RP, thus achieving redundancy backup between RPs.
n
■ Be sure to configure a 32-bit subnet mask (255.255.255.255) for the Anycast
RP address, namely configure the Anycast RP address into a host address.
■ An MSDP peer address must be different from the Anycast RP address.
MSDP Related Protocols
and Standards
MSDP is documented in the following specifications:
■ RFC 3618: Multicast Source Discovery Protocol (MSDP)
■ RFC 3446: Anycast Rendezvous Point (RP) mechanism using Protocol
Independent Multicast (PIM) and Multicast Source Discovery Protocol (MSDP)
MSDP Configuration
Task List
Complete these tasks to configure MSDP:
Task Remarks
“Configuring Basic Functions of
MSDP” on page 616
“Enabling MSDP” on page
616
Required
“Creating an MSDP Peer
Connection” on page 616
Required
“Configuring a Static RPF
Peer” on page 617
Optional
“Configuring an MSDP Peer
Connection” on page 618
“Configuring MSDP Peer
Description” on page 618
Optional
“Configuring an MSDP
Mesh Group” on page 618
Optional
“Configuring MSDP Peer
Connection Control” on
page 619
Optional