Operation Manual – Multicast
H3C S5600 Series Ethernet Switches
Chapter 5 MSDP Configuration
5-2
MSDP achieves this objective. By establishing MSDP peer relationships among RPs of
different PIM-SM domains, source active (SA) messages can be forwarded among
domains and the multicast source information can be shared.
Caution:
z
MSDP is applicable only if the intra-domain multicast protocol is PIM-SM.
z
MSDP is meaningful only for the any-source multicast (ASM) model.
5.1.2 How MSDP Works
I. MSDP peers
With one or more pairs of MSDP peers configured in the network, an MSDP
interconnection map is formed, where the RPs of different PIM-SM domains are
interconnected in series. Relayed by these MSDP peers, an SA message sent by an
RP can be delivered to all other RPs.
Figure 5-1
Where MSDP peers are in the network
As shown in
Figure 5-1
, an MSDP peer can be created on any PIM-SM router. MSDP
peers created on PIM-SM routers that assume different roles function differently.
1)
MSDP peers on RPs
z
Source-side MSDP peer: the MSDP peer nearest to the multicast source (Source),
typically the source-side RP, like RP 1. The source-side RP creates SA messages
and sends the messages to its remote MSDP peer to notify the MSDP peer of the
locally registered multicast source information. A source-side MSDP must be
created on the source-side RP; otherwise it will not be able to advertise the