How about explicit path TE with no autoroute announce (and only statics for these dedicated iBGP loopbacks?)
> 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 >>>> _______________________________________________ >>>> cisco-nsp mailing list [email protected] >>>> https://puck.nether.net/mailman/listinfo/cisco-nsp >>>> archive at http://puck.nether.net/pipermail/cisco-nsp/ >>>> >>> _______________________________________________ >>> cisco-nsp mailing list [email protected] >>> https://puck.nether.net/mailman/listinfo/cisco-nsp >>> archive at http://puck.nether.net/pipermail/cisco-nsp/ > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
