Hi All,
Got a Doubt on BGP Route Reflectors. BGP uses route reflectors to simplify
the IBGP mesh configuration.
Say a RR reflects an IBGP route announced by RRclient-1 to another RR
client say, RRClient-2. The RR keeps the next hop of the IBGP network
announced by RRclient-1 un-altered while announcing to RRclient-2. Now if
the next hop i.e. RRClient-1 is inaccessible to RRclient-2 , RRClient-2
will not advertise that route to its peers ( EBGP/IBGP). And IBGP peers can
be many hops away ( i.e. not directly connected/in same subnet). As per BGP
doc from Cisco , even if you use next-hop-self, only EBGP next hops will be
altered, not Reflected IBGP next hops. So in a large IBGP only network ( no
other IGP ), how will you ensure the connectivity to all the links between
RRClient nexthops?
Will they use any IGP or static route for this purpose ?. Or you have to
manipulate the point where you advertise each IBGP networks to contain
next-hop subnets also ?. Or is there any mistake in my understanding ?.
Please advice,
Thanks in advance
Regards
Rajesh
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