[c-nsp] 6500/SRA: vpnv4 vs. equal-cost multipath ?

[Oliver Boehmer (oboehmer)]

Alexandre Snarskii <> wrote on Monday, January 21, 2008 7:15 PM:

> Hi!
> 
> Summary: looks like IOS 12.2(33)SRA* can't handle vpnv4 routes
> which comes from peer reachable via two equal paths.

Have you verified that all links run LDP and everything is setup
correctly? A PE can load-share via equal-cost core paths just fine, so
something is wrong in your setup..

[...]
> this route is not installed in MPLS Forwarding table (at least not
> installed in correct way):
> 
> RouterA#show mpls forwarding-table vrf LOCAL 192.168.103.120 detail
> Local  Outgoing      Prefix            Bytes Label   Outgoing   Next
> Hop 
> Label  Label or VC   or Tunnel Id      Switched      interface
> None   535           192.168.103.120/29[V]   \
>                                        0
>         Recursive paths, Label Stack{535}
>          00217000
>         VPN route: LOCAL
>         No output feature configured
> 
> - you see, no outgoing interface mentioned in output, and label
> stack is just incorrect - it consists only from one (final) label...

On the ingress PE, you want to look into the CEF table (the LFIB is only
consulted for tagged packets), but even there you will only see one
label (the vpn label). the IGP/LDP label and outgoing interface will be
resolved at forwarding time, based on the result of the CEF hash.

	oli