[c-nsp] MPBGP, CEF drops and upgrade from 12.4.4 to 12.4.24

Karl Putland karl at simplesignal.com
Tue Oct 8 18:04:16 EDT 2013

Well... so it works in 12.4.4 but not 12.4.24 as configured.

I had wanted to use the global instead of specifying an interface. I don't
remember the train of thought for that right now as the config has been in
place for over a year.

I also wanted to avoid putting any static routes in the Customer VRFs and
instead use MPBGP to import the routes from vrf VOIP. So that I could
maintain all of the routes to be shared in a single table.


Karl Putland
Senior Engineer
Anywhere: 303-242-8608

On Tue, Oct 8, 2013 at 3:47 PM, Peter Rathlev <peter at rathlev.dk> wrote:

> On Tue, 2013-10-08 at 12:15 -0600, Karl Putland wrote:
> > So I have a working MPBGP VRF-Lite configuration that does what I
> > expect on 12.4.4. When I upgrade to 12.4.24 or 12.4.20 or 12.4.22 it
> > stops returning traffic from the customer VRFs and CEF drops packets
> > with Unresolved Route. 12.4.15 is the last 12.4 that seems to work.
> > 15.2.4 also appears to work. I'm hoping that someone can help shed
> > some light on this. I've been searching release notes for a couple of
> > days and I'm coming up empty.
> Maybe related to the next hop being unreachable in VRF
> "E701" since Gi0/1 is in global routing and the most specific covering
> route is -> drop?
> For VPN routes that require a next-hop you can just use the target
> address itself. Something like this:
> ip route vrf E701 Gi0/1
> ip route vrf E701 Gi0/1
> --
> Peter

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