[j-nsp] load balancing in Route reflector scenario

[Keegan Holley]

Not sure if others will have a better answer, but I don't think this is
possible.  As far as I know BGP doesn't support multi-pathing so there isn't
a way to have two next hops used for the same prefix.  You might be able to
peer with a loopback address and use your IGP to create equal cost routes to
the BGP loopback address.  If you run mpls that obviously complicates things
a bit.

2011/8/10 biwa net <biwa2go at gmail.com>

> Dear All
>
> I have a setup where I need to load balancing routes received from 2 RR in
> IPV4 environment (not VPN-IPV4)
>
> I have my  PE (let's called PE1) connected to 2 RR (cluster), my
> destination
> subnet eg: 10.1.1.1/24 is behind 2 PE (PE-2 and PE3) which are also client
> of the same 2RR
>
> PE-2 and PE3 are sending the same route 10.1.1.1/24 to the RR ,  which as
> per normal behavior is selecting the best route to PE1  ,
>
> My issue is that RR is always advertising the route 10.1.1.1/24 through
> PE2
> (due to lower router id) as best path and I would like to load balanced it
> through PE2 and PE3
>
> Anyone can recommend a way to load balance ?
>
> Unfortunately I dont have a lab to test any solution and there are live
> traffic on this ,so all I can do is guessing is whether the below 2 option
> would work or not.
>
> 2 option I have
>
> 1.So here I am trying to thinking about testing the multipath command under
> the RR configuration  to see if I am receiving routes from both PE or not ,
>
> 2.  try to put all devices them in routing instance VRF , with the BGP
> configuration under it (both RR and client) , and RD configured in the VRF
> (but not putting any vpn family under bgp) so that it stays IPV4 routes ,
> maybe I could cheat the RR to believe these are 2 differentes routes due to
> the RD, but dont know if this works or not .
>
> anyone has had similar issue and found a workaround ?
>
> does the 2 option above actually work or not ?
>
> thanks for any input
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