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Configuring IP Multicast Protocols
December 2005
© Foundry Networks, Inc.
19 - 39
member of the group. The RP that originated the SA or the first RP in a domain that receives the SA message is
the only one that can forward the message to the members of a mesh group. An RP can forward an SA message
to any MSRP router as long as that peer is farther away from the originating RP than the current MSRP router.
Figure 19.5 shows an example of an MSDP mesh group. In a PIM-SM mesh group the RPs are configured to be
peers of each other. They can also be peers of RPs in other domains.
Figure 19.5
Example of MSDP mesh group
PIM Sparse Domain 1 in Figure 19.5 contains a mesh group with four RPs. When the first RP, for example, RP
206.251.21.41 (which is also the originating RP), receives an SA message from the source, it sends the SA
message to its peers within the domain, but the peers do not send the message back to the originator RP or to
each other. The RPs then send the SA message to their peers in other domains.The process continues until all
RPs within the network receive the SA message. RPs send join and prune messages to appropriate points on the
multicast tree towards the originating RP.
Configuring MSDP Mesh Group
To configure an MSDP mesh group, enter commands such as the following on each device that will be included in
the mesh group:
FastIron SuperX Router(config)# router msdp
FastIron SuperX Router(config-msdp-router)# msdp-peer 163.5.34.10 connect-source
loopback 2
FastIron SuperX Router(config-msdp-router)# msdp-peer 206.251.21.31 connect-source
loopback 2
FastIron SuperX Router(config-msdp-router)# msdp-peer 206.251.17.31 connect-source
loopback 2
FastIron SuperX Router(config-msdp-router)# msdp-peer 206.251.13.31 connect-source
PIM Sparse Domain 1
Mesh GroupA
RP 206.251.18.31
RP 206.251.19.31
RP 206.251.21.31
PIM Sparse Domain 4
Source for Group
232.1.0.95
206.251.14.22
PIM Sparse Domain 2
1. DR receives traffic
from source and registers
source with RP
2. RP sends an SA message
to its peers within the domain
3. RPs within the domain receive
the SA message and floods the
SA message to its peers in
other PIM Sparse domains
PIM Sparse Domain 3
RP 206.251.20.31
Designated
Router (DR)
RP
RP
RP
Summary of Contents for FastIron Edge Switch X424
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