I was working on an lab with MSDP & MBGP only to realise that Multicast BGP
was doing nothing ie if i just has ipv4 unicast BGP working with my MSDP
peers, multicast worked fine. Can anyone give me a few scenarios owhen we
would need to use multicast BGP and also mesh groups under MSDP as i'm a
little hazzy on those as well.
The only thing that i can think of with multicast BGP is if you had an rfp
failure based on your unicast routing table and you weren't allow to use the
'ip mroute' command, then you could advertise your RP within multicast over
a different peer to override your standard rpf check as MBGP routes are
preferred over unicast routes. Is my understanding correct here?
1. Static mroutes
2. DVMRP routes
3. MBGP routes
4. Unicast routes
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