We are currently considering a move from carrying
all our internal prefixes in OSPF to using iBGP
to carry the edge prefixes, and just using OSPF
to carry the BGP next-hop.
The way I'm thinking of doing this is by redist'ing
connected and static routes into iBGP via a route-
map that sets community 'no-export' to make sure
we don't leak the more specific prefixes, but I
am looking for arguments for and against setting
next-hop-self on iBGP peerings - the most obvious
argument that I can see in favour is that of not
having to carry external next-hops around in the
IGP - but I am sure there must be a disadvantage
to not knowing what the external next-hop was,
although I am not sure what it might be.
Any assistance greatly appreciated,
M.
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