From: Dalu-Chandu, Jay (JD163604@NCR.COM)
Date: Thu Nov 11 2004 - 08:09:51 GMT-3
Robert,
You've seen this before I take it?
R5#show mpls ldp neighbor
Peer LDP Ident: 192.168.3.3:0; Local LDP Ident 192.168.5.5:0
TCP connection: 192.168.3.3.646 - 192.168.5.5.11009
State: Oper; Msgs sent/rcvd: 53/54; Downstream
Up time: 00:31:33
LDP discovery sources:
Serial4/3, Src IP addr: 172.16.35.6
Addresses bound to peer LDP Ident:
172.16.136.3 150.50.100.5 150.50.100.9 150.50.100.13
172.16.35.6 192.168.3.3 192.168.100.1 192.168.101.1
172.16.136.10
R1#show mpls ldp neigh
Peer LDP Ident: 192.168.3.3:0; Local LDP Ident 192.168.1.1:0
TCP connection: 192.168.3.3.11650 - 192.168.1.1.646
State: Oper; Msgs sent/rcvd: 33/35; Downstream
Up time: 00:14:10
LDP discovery sources:
Serial4/0.1, Src IP addr: 150.50.100.9
Addresses bound to peer LDP Ident:
172.16.136.3 172.16.35.6 192.168.3.3 192.168.100.1
192.168.101.1 172.16.136.10 150.50.100.5 150.50.100.13
150.50.100.9
R1#
Regards
Jay
-----Original Message-----
From: McCallum, Robert [mailto:robert.mccallum@thus.net]
Sent: 11 November 2004 10:30
To: Dalu-Chandu, Jay; Mike Bernico
Cc: comserv@groupstudy.com; ccielab@groupstudy.com; Mark Lewis
Subject: RE: MPLS/VPN/ISIS
you have a host route untagged - BAD NEWS. Can you show a show mpls
neighbor.
Robert McCallum
CCIE #8757 R&S
01415663448
07818002241
> -----Original Message-----
> From: Dalu-Chandu, Jay [mailto:JD163604@NCR.COM]
> Sent: 11 November 2004 09:57
> To: Mike Bernico
> Cc: comserv@groupstudy.com; ccielab@groupstudy.com; Mark Lewis
> Subject: RE: MPLS/VPN/ISIS
>
>
> Mike,
>
> Thanks for your advice. I have done all the basic checks and
> confirmed my configuration. I have also tested this scenario using 3
> different routers successfully.
>
> I have tried clearing the cef table and reloading R5 but the same
> problem persists. I have noticed that labels are being propagated and
> received for R1's loopback address but not installed in the Lfib. See
> commands below;
>
> R5#show mpls ldp bindings 192.168.1.1 32
> tib entry: 192.168.1.1/32, rev 65
> local binding: tag: 508
> remote binding: tsr: 192.168.3.3:0, tag: 307 R5#show mpls
> forwarding-table 192.168.1.1
> Local Outgoing Prefix Bytes tag Outgoing Next Hop
> tag tag or VC or Tunnel Id switched interface
> 508 Untagged 192.168.1.1/32 0 Se4/3 point2point
> R5#show ip cef 192.168.1.1
> 192.168.1.1/32, version 47, epoch 0, cached adjacency to
> Serial4/3 0 packets, 0 bytes
> tag information set, shared
> local tag: 508
> via 172.16.35.6, Serial4/3, 1 dependency
> next hop 172.16.35.6, Serial4/3
> valid cached adjacency
> tag rewrite with Se4/3, point2point, tags imposed: {}
>
> The mpls ping command is available and works both ways.
> R5#ping tag 192.168.1.1
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2
> seconds: !!!!! Success rate is 100 percent (5/5), round-trip
> min/avg/max = 16/16/20 ms R5#
>
> R1#ping tag 192.168.5.5
>
> Type escape sequence to abort.
> Sending 5, 100-byte ICMP Echos to 192.168.5.5, timeout is 2
> seconds: !!!!! Success rate is 100 percent (5/5), round-trip
> min/avg/max = 16/16/20 ms R1#
>
> Any further thoughts?
>
> Regards
>
> Jay
>
> -----Original Message-----
> From: Mike Bernico [mailto:mbernico@illinois.net]
> Sent: 10 November 2004 19:45
> To: Dalu-Chandu, Jay; comserv@groupstudy.com; ccielab@groupstudy.com
> Subject: RE: MPLS/VPN/ISIS
>
> Hard to say without your configs. Here are some things to try that
> might help...
>
> Since you're only getting one label in your cef show command, you must
> be missing one.
>
> Does your version of IOS support mpls ping? That definitely helps.
> If it does, do an extended mpls ping from loopback to loopback and
> verify you've got yourself an LSP that works.
>
> It sounds like you've already done the most important part, by making
> sure that the exact route exists end-to-end for your loopbacks.
>
> Also you should probably verify the obvious stuff if you haven't. LDP
> neighbors, cef on all routers, stuff like that.
>
> Also maybe use "show mpls forwarding-table" to check the lsp by hand
> if you can't mpls ping.
>
> Ok, so then if all that works, maybe it is the label BGP sends?
> Possibly check to make sure that neighbor x.x.x.x send-community
> extended is turned on.
>
> Anyway, that's what I'd try first. Let me know what it is when you
> find it!
>
> Good Luck,
> Mike
>
>
>
>
> -----Original Message-----
> From: Dalu-Chandu, Jay [mailto:JD163604@NCR.COM]
> Sent: Wednesday, November 10, 2004 11:50 AM
> To: comserv@groupstudy.com; ccielab@groupstudy.com
> Subject: MPLS/VPN/ISIS
>
> Guys,
>
> I have a question regarding a sample lab configuration I'm currently
> working on. The IGP used is ISIS with two areas
> 49.0001 and 49.0005. Within area 1 I have an L1 only router attached
> to a L1L2 router, which is in turn attached to a L2 router in area 5.
>
> R1(L1)--------R3(L1/L2)----------R5(L2)
>
> R1 and R5 are PE routers, R3 is a P router. A BGP relationship for
> vpnv4 has been established to the loopbacks of the PE devices. I can
> see the vrf routes associated on each PE device. When I try to ping
> an IP address within the vrf from R1 to R5 I see cef drops (debug ip
> cef drops). I notice that no label exists for the next-hop-address of
> R5 because I am only receiving the default from R3. To correct this I
> route-leaked L2 into L1 for R5's loopback.
>
> Now I have a label and no more cef packet drops on R1. But I still
> cannot ping. R5 complains that it does not have a parent tag when I
> try pinging from there (debug ip cef drops). I also notice that only
> a single label is imposed when looking at show ip cef vrf xxx A.B.C.D?
> Can anyone help, am I missing something obvious?
>
> Regards
>
> Jay Dalu-Chandu
>
> --
> Network Consultant (BEng, CCNP)
> NCR UK Limited
> Mobile: 07803231944
> Email: jay.dalu-chandu@ncr.com
>
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