H3C S7500E Series Operation Manual page 747

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches
data from the multicast source arrives, the receiver-side MSDP peer forwards the
data to the receivers along the RPT.
Intermediate MSDP peer: an MSDP peer with multicast remote MSDP peers, like
RP 2. An intermediate MSDP peer forwards SA messages received from one
remote MSDP peer to other remote MSDP peers, functioning as a relay of
multicast source information.
2) MSDP peers created on common PIM-SM routers (other than RPs)
Router A and Router B are MSDP peers on common multicast routers. Such MSDP
peers just forward received SA messages.
Note:
An RP is dynamically elected from C-RPs. To enhance network robustness, a PIM-SM
network typically has more than one C-RP. As the RP election result is unpredictable,
MSDP peering relationships should be built among all C-RPs so that the winner C-RP
is always on the "MSDP interconnection map", while loser C-RPs will assume the role
of common PIM-SM routers on the "MSDP interconnection map".
II. Implementing inter-domain multicast delivery by leveraging MSDP peers
As shown in
RP 1 has learned the existence of Source through multicast source registration. If RPs
in PIM-SM 2 and PIM-SM 3 also wish to know the specific location of Source so that
receiver hosts can receive multicast traffic originated from it, MSDP peering
relationships should be established between RP 1 and RP 3 and between RP 3 and RP
2 respectively.
Figure 6-2, an active source (Source) exists in the domain PIM-SM 1, and
6-3
Chapter 6 MSDP Configuration