Manu,
> 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 :)
Hmm, you could also cause iBGP session to fail if you just add an interface ACL
not allowing iBGP between your PEs across the links not running MPLS.
Not sure if there is any real solution to this, other than increasing the link
metric towards the "non-MPLS-capble part" so much that MPLS packets will not
cross these links (or turn this part of the network into a stub area to achieve
the same).
oli
> On Wed, Oct 14, 2009 at 2:10 PM, Oliver Boehmer (oboehmer)
> <[email protected]> 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
> > <[email protected]>wrote:
> >
> > > Router bgp <AS>
> > > Neighbor <AS> ttl-security hops <hops>
> > >
> > > ?
> > >
> > > Ken Matlock
> > > Network Analyst
> > > Exempla Healthcare
> > > (303) 467-4671
> > > [email protected]
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: [email protected]
> > > [mailto:[email protected]] On Behalf Of Manu Chao
> > > Sent: Tuesday, October 13, 2009 4:52 AM
> > > To: [email protected]
> > > 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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> > >
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