Ok, I'll try to clear up some odd thoughts there.
RR's simply allow the mesh to scale more gracefully, they do not modify path
information (ie the Next_hop attribute) anywhere unless explicitly told to
do so.
Hence,
In your example, RRClient which must be an ASBR (ie ebgp peering to outside
AS) learns a route and posts either the EBGP next hop or its own to the
Next_Hop field. The RR server (assuming RR client1 and RRclient two are not
peering) will simply send the same info to RRClient2. Hence, RRClient 2,
the RR server, RRclient1 and every other router in the network, no matter
how many times you reflect, will need reachability to the same Next_Hop.
IGP's are used for this.
Pete
*********** REPLY SEPARATOR ***********
On 5/2/2001 at 12:26 PM RAJESH.V.S wrote:
>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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