Full mesh group

MSDP mesh groups are full mesh of MSDP peers and is a subset of MSDP speakers. MSDP mesh groups are used for SA flooding which is similar to the BGP route reflector concept. MSDP floods the SA to all the members of the mesh group when:

The MSDP peers are fully meshed
The MSDP enabled router learns a new SA from a non-member of its mesh group
The SA passes the RPF check

The receiving routers accept the SA and forwards it only to any non-mesh Group MSDP peers.

The SPB-PIM Gateway is deployed in two models:

Model 1: All multicast networks have peering agreements with one another. The full mesh MSDP is setup.
Model 2 : An inter-domain multicast provider exists. All multicast networks setup MSDP peering with the provider.

The controllers relay SA messages between individual networks.

Note

Consider the following when you deploy SPB-PIM Gateway:

Use mesh group of MSDP peers (PIM RP's and SPB-PIM Gateway Controller nodes) to avoid flooding and RPF failure.
Note

Since MSDP uses CLIP interface in its peering relation, the MSDP peer may not fall in any of the RFC rules and the MSDP SA messages will be rejected.
Controllers from the same SPB network must not have MSDP sessions with each other, regardless of whether mesh groups are used or not.
When using mesh groups, all Controllers within one SPB domain should peer with the same set of RPs and Controllers in adjacent domains, ie, one Controller should not peer with an RP that the other Controllers do not peer with.