What platforms are R8 and R9? I can recall that I also had some issues with flapping LDP neighbors on the 3640's. On the 7200's though it should work fine. Only had issues with labels not getting allocated and then a clear of any kind will always help :-) --
Regards, Rick Mur CCIE2 #21946 (R&S / Service Provider) Sr. Support Engineer – IPexpert, Inc. URL: http://www.IPexpert.com On Fri, Sep 4, 2009 at 6:13 AM, Bryan Bartik <[email protected]> wrote: > Hello, > > I am running an inter-as + CSC scenario with OSPF and MPLS between the SPs. > The LDP peering is dropping exactly every 3 minutes and coming back up. > Connectivity is fine throughout the VPN when the session is up. I don't see > any route flapping in the debugs. > > AS65123[R3]---------[R8]AS100---------AS200[R9]---------[R1]AS65123 > > AS100 and AS200 have an inter-as VPN supporting the 2nd level carrier > AS65123. > R9 and R8 have vrf interfaces connected to R1 and R3 respectively. > R1 has an LDP/OSPF peering with R9 (in the vrf) in AS100 > R3 has an LDP/OSPF peering with R8 (in the vrf) in AS200 > > Both LDP sessions are bouncing on queue every 3 minutes! Here is R8 for > example: > > R8# > *Sep 3 21:50:49.575: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.3:0 is DOWN > *Sep 3 21:50:59.475: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.3:0 is UP > *Sep 3 21:53:59.491: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.3:0 is DOWN > *Sep 3 21:54:09.291: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.3:0 is UP > *Sep 3 21:57:09.311: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.3:0 is DOWN > *Sep 3 21:57:19.331: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.3:0 is UP > *Sep 3 22:00:19.351: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.3:0 is DOWN > *Sep 3 22:00:29.239: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.3:0 is UP > > Now just before the session dies I get the following from "debug mpls ldp > transport events interface x/x". This is from R9: > > R9# > *Sep 3 22:09:27.295: ldp: Send ldp hello; Serial1/2, src/dst > 123.1.9.9/224.0.0.2, inst_id 0 > *Sep 3 22:09:28.787: ldp: Rcvd ldp hello; Serial1/2, from 123.1.9.1 ( > 123.123.123.1:0), intf_id 0, opt 0xC > *Sep 3 22:09:32.127: ldp: Send ldp hello; Serial1/2, src/dst > 123.1.9.9/224.0.0.2, inst_id 0 > *Sep 3 22:09:33.239: ldp: Rcvd ldp hello; Serial1/2, from 123.1.9.1 ( > 123.123.123.1:0), intf_id 0, opt 0xC > *Sep 3 22:09:36.111: ldp: Send ldp hello; Serial1/2, src/dst > 123.1.9.9/224.0.0.2, inst_id 0 > *Sep 3 22:09:36.907: tagcon: Session KeepAlive timer expired, peer > 123.123.123.1:0 (pp 0x64027BD8) > *Sep 3 22:09:36.911: ldp: Close LDP transport conn for adj 0x63486648 > *Sep 3 22:09:36.915: ldp: Closing ldp conn 123.1.9.9:646 <-> > 123.123.123.1:11015, adj 0x63486648 > *Sep 3 22:09:36.919: ldp: Adj 0x63486648; state set to closed > *Sep 3 22:09:36.923: %LDP-5-NBRCHG: LDP Neighbor 123.123.123.1:0 is DOWN > > Even though I am sending and receiving hellos, I am getting the session > keepalive timer expired. Any ideas? > > Thanks! > -- > Bryan Bartik > CCIE #23707 (R&S), CCNP > Sr. Support Engineer - IPexpert, Inc. > URL: http://www.IPexpert.com > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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