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<div class="moz-cite-prefix">On 22/Apr/16 11:36, joel ahumuza wrote:<br>
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<div dir="ltr">Hi All,<br>
<br>
We are experiencing an issue with ACX routers running on
12.3X54-D20.7 where the LDP sessions are continuously flapping,
the logs indicate the following;<br>
<br>
<small><small>Apr 21 03:36:31 hostname rpd[2299]:
RPD_LDP_SESSIONDOWN: LDP session x.x.x.x is down, reason:
hold time expired<br>
Apr 21 03:36:34 hostname rpd[2299]: RPD_LDP_NBRDOWN: LDP
neighbor x.x.x.x (lo0.0) is down<br>
Apr 21 03:36:38 hostname rpd[2299]: RPD_LDP_NBRDOWN: LDP
neighbor x.x.x.x (lo0.0) is down<br>
Apr 21 03:36:38 hostname rpd[2299]: RPD_LDP_SESSIONDOWN:
LDP session x.x.x.x is down, reason: all adjacencies down<br>
Apr 21 03:55:34 hostname rpd[2299]: RPD_LDP_SESSIONDOWN:
LDP session x.x.x.x is down, reason: received notification
from peer<br>
Apr 21 03:55:34 hostname rpd[2299]: RPD_LDP_SESSIONDOWN:
LDP session x.x.x.x is down, reason: received notification
from peer<br>
Apr 21 03:55:35 hostname rpd[2299]: RPD_LDP_SESSIONDOWN:
LDP session x.x.x.x is down, reason: received notification
from peer<br>
Apr 21 03:55:35 hostname rpd[2299]: RPD_LDP_SESSIONDOWN:
LDP session x.x.x.x is down, reason: received notification
from peer</small></small><br>
<br>
Actions taken from our team was;<br>
- Increase the hold time setting on the ldp enabled interfaces.<br>
- Increase the time interval on the same ldp enabled interfaces.<br>
- setting the ldp session protection setting on the ldp enabled
loopback interface.<br>
<br>
Unfortunately the actions did not yield much since the flaps
have been ongoing.<br>
<br>
Anyone have any Idea on what the problem / solution might be?
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<br>
You want to start troubleshooting a lot lower in the layers, first,
before looking at what's causing LDP to flap.<br>
<br>
First, is the underlying link stable? Check to see what your IGP is
saying about the link.<br>
<br>
Then take it from there.<br>
<br>
Mark.<br>
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