The MPLS-OPS Archive

[rachid zitouni <rzitouni@yahoo.fr>]

since the 12.2(4)T Cisco IOS version, It's possible
for the router running mp-ibgp to select a bgp
multipath.

The BGP Multipath Load Sharing for MP-iBGP allows PE
routers to be configured to distribute traffic across
iBGP path. 
But ther is a route reflector limitation :
With multiple iBGP paths installed in a routing table,
a route reflector will advertise only one of the paths
(one next hop). If a router is behind a route
reflector, all routers that are connected to
multihomed sites will not be advertised unless
separate VRFs with different RDs are configured for
each VRF.




--- noemi.fernandez@amena.es a écrit : > 
> 
> 
>      Hi all,
> 
>      a Route Reflector (RR) is supposed to simulate
> IBGP connections
> between the RR clients, so it has to forward the
> updates received from
> clients to the rest of clients. However we have
> faced up with the following
> situation.
> 
>      We have routers A, B, C and D, as clients of a
> RR . A and B are
> announcing to the RR the same network (for instance
> 1.1.1.0/24) with
> different attributes. We supposed that router C and
> D would received the
> two updates from RR. However, we have realized that
> the RR selelected the
> best path according to its policy routing and only
> reflected this best path
> to the other RR clients.
> 
>      As you could suppose we are interested on C and
> D receive the two
> updates, so that they can apply their own policy
> routing to select the best
> path.
> 
>      Should not the RR forward all the updates that
> it receives from the
> clients to the rest of the clients?
>      Any suggestions to overcome this problem?
> 
>      Thanks,
>      Noemí.
> 
> 
> 
> 
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