Problem here. RRclient1 is originating the route which means it must be
EBGP connected to another AS. Hence, it must do the rewrite. The RR server
never rewrites anything unless told to do so. Further, Cisco does not
support IBGP next hop re-writes as far as I know. I have seen and used this
concept in MPLS networks were I needed a specific IBGP only box to terminate
LSP's, but in reality, there are few cases where you want to rewrite
Next_Hop on an IBGP connection (Juniper supports this by the way)
Generally, you rewrite once at the perimeter in order to keep your IGP table
small.
*********** REPLY SEPARATOR ***********
On 5/2/2001 at 1:09 PM Trey Webb wrote:
>next-hop-self on the route-reflector will work here.
>
>--trey
>----- Original Message -----
>From: "RAJESH.V.S"
>To:
>Sent: Wednesday, May 02, 2001 12:26 PM
>Subject: BGP Route Reflector Question. [7:2900]
>
>
>> 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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