3com 5500-ei pwr Installation Instruction

 

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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.  

 

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”.  

 

As shown in 

, an active source (Source) exists in the domain PIM-SM 1, and 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 5-2 MSDP peering relationships 

PIM-SM 1

PIM-SM 3

PIM-SM 2

PIM-SM 4

MSDP peers

SA message

Join message

Multicast packets

Register message

 

 

The process if implementing inter-domain multicast delivery by leveraging MSDP peers is as follows: