we had a very similar issue with flapping neighbours - our problem was the
NAT config we were using.
Maybe you can post the configs of both routers so we can look
Andrew
-----Original Message-----
From: John Neiberger [mailto:[EMAIL PROTECTED]]
Sent: 03 January 2001 17:51
To: [EMAIL PROTECTED]
Subject: I'm stumped! (was EIGRP over ISDN) LONG
I'm reposting this in the hopes that someone who didn't see it before might
have some ideas about this. Heck, SWAGs, educated guesstimates, or
telephone psychic impressions are also welcome. We are completely stumped
about how to resolve this. I've even posted this question on the CCO Q&A
Forum but I don't think anyone has been answering questions on there lately.
Here is the problem: we have an ISDN BRI backup link between two sites, and
we want to run eigrp over the link when it's in use. The problem is that
even though the line is not flapping, eigrp is behaving as if it were
flapping. My side NEVER sees hellos from the other side, but it does
receive updates. The other side receives my hellos, but it thinks the link
is bouncing and that my router is intermittently unavailable. My side never
establishes the other as a neighbor.
I've used every debugging command I can find to no avail. Nothing is giving
me any information that I don't already know. We have no access lists
configured, except for distribute lists but that shouldn't affect neighbor
relationships, should it?
Here is sample debug output (debug eigrp neighbors and debug eigrp packet):
3d01h: EIGRP: Sending HELLO on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
3d01h: EIGRP: Sending HELLO on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
3d01h: %LINK-3-UPDOWN: Interface BRI0:1, changed state to up
3d01h: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state
to up
3d01h: EIGRP: Sending HELLO on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
3d01h: EIGRP: Received UPDATE on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x1, Seq 67/0 idbQ 0/0
3d01h: EIGRP: Neighbor(10.120.226.2) not yet found
3d01h: EIGRP: Received UPDATE on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x1, Seq 67/0 idbQ 0/0
3d01h: EIGRP: Neighbor(10.120.226.2) not yet found
3d01h: %ISDN-6-CONNECT: Interface BRI0:1 is now connected to 303xxxxxx
theirrouter
3d01h: EIGRP: Sending HELLO on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
3d01h: EIGRP: Received UPDATE on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x1, Seq 67/0 idbQ 0/0
3d01h: EIGRP: Neighbor(10.120.226.2) not yet found
3d01h: EIGRP: Received UPDATE on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x1, Seq 67/0 idbQ 0/0
3d01h: EIGRP: Neighbor(10.120.226.2) not yet found
3d01h: EIGRP: Sending HELLO on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
3d01h: EIGRP: Sending HELLO on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x0, Seq 0/0 idbQ 0/0 iidbQ un/rely 0/0
3d01h: EIGRP: Received UPDATE on BRI0 nbr 10.120.226.2
3d01h: AS 2, Flags 0x1, Seq 67/0 idbQ 0/0
3d01h: EIGRP: Neighbor(10.120.226.2) not yet found
Here is some info from the remote side:
theirrouter#
1d02h: EIGRP: Retransmission retry limit exceeded
1d02h: EIGRP: Holdtime expired
1d02h: EIGRP: Neighbor 10.120.226.1 went down on BRI0/0
1d02h: EIGRP: New peer 10.120.226.1
theirrouter#sho ip eigrp neighbors
IP-EIGRP neighbors for process 2
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 10.120.226.1 BR0/0 12 00:00:38 0 5000 1 0
1d02h: EIGRP: Retransmission retry limit exceeded
1d02h: EIGRP: Holdtime expired
1d02h: EIGRP: Neighbor 10.120.226.1 went down on BRI0/0
1d02h: EIGRP: New peer 10.120.226.1
I'm not getting any errors on the line, and further debugging (isdn q921,
isdn q931, ppp error, ppp auth, ppp neg, bri-interface) does not show any
problems whatsoever. I've tried ping tests with different payloads and they
succeeded wonderfully.
I've also made sure that we are in the same 'AS'. We are running 12.1(5) on
a 2520, they run 12.0(5) on a 2524. I've searched CCO for any configuration
hints or bug reports, and I've read through Doyle's Routing TCP/IP section
on eigrp and I can find no possible explanation for this behavior.
Any takers? ideas? hints? tips? Do you know a good psychic or witch
doctor? Perhaps a good psychiatrist, instead? :-)
For anyone who has taken the time to read through all of this, I thank you.
Regards,
John
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