H3C Technologies H3C SecPath F1000-E - Manual (Page 62)

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MSDP Configuration
This chapter includes these sections:
• MSDP Overview
• MSDP Configuration Task List
• Displaying and Maintaining MSDP
• MSDP Configuration Examples
• Troubleshooting MSDP
NOTE:
•
The term router in this document refers to network routing devices running a routing protocol.
• For more information about the concepts of designated router (DR), bootstrap router (BSR),
candidate-BSR (C-BSR), rendezvous point (RP), candidate RP (C-RP), shortest path tree (SPT) and
rendezvous point tree (RPT) mentioned in this document, see PIM Configuration in the IP
Multicast Volume
.
MSDP Overview
Introduction to MSDP
Multicast source discovery protocol (MSDP) is an inter-domain multicast solution developed to address
the interconnection of protocol independent multicast sparse mode (PIM-SM) domains. It is used to
discover multicast source information in other PIM-SM domains.
In the basic PIM-SM mode, a multicast source registers only with the RP in the local PIM-SM domain, and
the multicast source information of a domain is isolated from that of another domain. As a result, the RP
is aware of the source information only within the local domain and a multicast distribution tree is built
only within the local domain to deliver multicast data from a local multicast source to local receivers. If
there is a mechanism that allows RPs of different PIM-SM domains to share their multicast source
information, the local RP will be able to join multicast sources in other domains and multicast data can
be transmitted among different domains.
MSDP achieves this goal. With MSDP peer relationships established between appropriate routers in the
network, the RPs of different PIM-SM domains are interconnected with one another. Source active (SA)
messages are exchanged between these MSDP peers and thus the multicast source information is shared
among these different domains.
CAUTION:
•
MSDP is applicable only if the intra-domain multicast protocol is PIM-SM.
• MSDP is meaningful only for the any-source multicast (ASM) model.