[c-nsp] ibgp TTL

[Manu Chao]

Oli,

More detail:

I have a standard IP/MPLS backbone with MP-iBGP between PEs loopbacks with
IS-IS L2 or OSPF area 0 as IGP.

This IGP is extended to some non MPLS routers X.

In some backbone links failure, IGP allow MP-iBGP to stay UP via X links
(non MPLS).

This specific IGP design introduce a L3VPN blackhole that can be solved by
IGP prefix filtering or by limiting TTL for MP-iBGP sessions, if possible :)

On Wed, Oct 14, 2009 at 2:10 PM, Oliver Boehmer (oboehmer) <
oboehmer at cisco.com> wrote:

> yes, only supported for ebgp. Would be interested about the "very
> specific design" and why Manu requires this functionality?
>
>        oli
>
> > AFAIK this command is for eBGP only, no?
> >
> > On Tue, Oct 13, 2009 at 10:07 PM, Matlock, Kenneth L
> > <MatlockK at exempla.org>wrote:
> >
> > > Router bgp <AS>
> > > Neighbor <AS> ttl-security hops <hops>
> > >
> > > ?
> > >
> > > Ken Matlock
> > > Network Analyst
> > > Exempla Healthcare
> > > (303) 467-4671
> > > matlockk at exempla.org
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: cisco-nsp-bounces at puck.nether.net
> > > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Manu Chao
> > > Sent: Tuesday, October 13, 2009 4:52 AM
> > > To: cisco-nsp at puck.nether.net
> > > Subject: [c-nsp] ibgp TTL
> > >
> > > For a very specific design, i need to limit TTL value in
> ibgp-multihop.
> > >
> > > Is it possible to limit iBGP TTL like we do with ebgp-multihop ttl
> > > command?
> > >
> > > Any input appreciated.
> > >
> > > Manu
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