[c-nsp] MSDP between Anycast RPs

[James Slepicka (c-nsp)]

I have two PIM domains configured with Anycast RPs:

-------------
|R1 ----- R2|  Anycast RP 1.1.1.1
-------------
 \       /
  \     /
   \   /
    \ /
     R3
     |
     | BGP
     |
     R4
    / \
   /   \
  /     \
 /       \
-------------
|R5 ----- R6|  Anycast RP 2.2.2.2
-------------


RFC 4611 says that redundancy between mesh groups will cause a loop (http://tools.ietf.org/html/rfc4611#section-3.3), so is there a way to run MSDP with redundancy between these two domains?  Should the Anycast RP mesh group be extended out to the edge routers (R3/R4) and MSDP be setup there?  What about if I add another set of edge routers for a backup link?

Thanks,
James