From: Mike Bernico (mbernico@illinois.net)
Date: Wed Nov 10 2004 - 16:44:51 GMT-3
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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