[c-nsp] mpls/ip load balancing

[Oliver Boehmer (oboehmer)]

Marlon Duksa <> wrote on Tuesday, November 25, 2008 06:20:

> Hi - does anyone know how load balancing by default works over two
> paths, one using MPLS and the other one IP. I have the same route
> advertisement received over two different interfaces. On one
> interface LDP is enabled (and of course OSPF), the other interface is
> only OSPF enabled. Traffic 
> is definitely load balanced across the two interfaces, but I was
> wondering what fields the hashing is based on?

Well, hash is based on <src,dest> Layer 3 information. However this is
doomed to fail if the ingress packet is tagged (for example L3VPN), then
the node might strip the labels when hashing it over the non-LDP-enabled
interface.

	oli