[c-nsp] load balance between to EBGP peers

[Peter Rathlev]

On Thu, 2008-11-27 at 15:26 +0200, moshe mizrachi wrote:
> i have MPLS/VPN network based on 7600's . all the Internet is going via
> VRF-INTERNET , my ASBR gets full route from 2 peers via OC12 POS
> interfaces on VRF INTERNET  , also he gets 0.0.0.0 route from both
> peers but of course only 1 gets to FIB .
> my target is to get load balance between the 2 peers(on the ASBR) in
> the outgoing traffic and to redistribute only 0.0.0.0 to VRF INTERNET
> to all the IBGP peers.  what i see now is  that the 0.0.0.0 gets label
> in the FIB of the ASBR pointing on one of the POS interface, so the
> other POS stay empty , with the show ip route vrf INTERNET 0.0.0.0
> 0.0.0.0 command i see the LB0 of the ASBR which is OK but the MPLS
> label table on the VRF INTERNET is pointing on the POS interface . i
> just want that the ASBR will route the traffic according to his full
> route table .
> 
> so actually now i redistribute to all PE's /20 subnets for getting load
> balance ,
> does someone have a good ides for this one ?

As I understand your description, the box has a specific forwarding
adjacency for the traffic received on the 0/0 LSP from the core. To make
it use the routing table, you need it to perform a routing lookup, which
(AFAIK) an aggregate label will do for you.

Haven't tested this, but if you stop redistributing a default received
from upstream, and instead add a static default pointing to Null0 in the
VRF, you should get an aggregate label. This might result in lower
performance, since the router needs to a full IP lookup.

Regards,
Peter