RE: Flapping links issue...

I have implemented multicasting yet on this network.sw1 is server and rest are
clients.

--- On Fri, 18/9/09, Cristian Matei <cristian.matei_at_datanets.ro> wrote:

From: Cristian Matei <cristian.matei_at_datanets.ro>
Subject: RE: Flapping links issue...
To: "'Naufal Jamal'" <naufalccie_at_yahoo.in>, "'Darby Weaver'"
<darby.weaver_at_gmail.com>
Cc: ccielab_at_groupstudy.com
Date: Friday, 18 September, 2009, 10:15 PM

I think you have a multicast propagation issue here; updates seem to be sent
but not acknowledged back. After 15 retries of updating, and no Ack
received, EIGRP will reset (Peer Goodbye Received) the neighbor. Do you have
pruning activated, or some of the switches are in transparent mode?

Regards,
Cristian.

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Naufal Jamal
Sent: Saturday, September 19, 2009 1:05 AM
To: Darby Weaver
Cc: ccielab_at_groupstudy.com
Subject: Re: Flapping links issue...

Hi,
O.k Here is the config.I have 4 switches connectd through trunk.Below is the
config and debug eigrp neigh output.The config seems o.k to me.but I am
concerned
about any l2 issue which I dont want to waste time upon inside the war-room
:)

*Mar 1 03:00:50.783: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.1 (Vlan100) is down: holding time expired
SW2(config-router)#
*Mar 1 03:00:52.139: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.4 (Vlan100) is down: Peer goodbye received
*Mar 1 03:00:52.163: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.4 (Vlan100) is up: new adjacency

SW2(config-router)#do sh ip eigrp ne
IP-EIGRP neighbors for process 10
H Address Hold Uptime SRTT RTO Q Seq
                                            (sec) (ms) Cnt
Num
2 1.1.100.1 Vl100 14 00:04:30 219 1314 0
42
0 1.1.100.4 Vl100 6 00:04:37 114 684 0
46
1 1.1.100.3 Vl100 13 00:55:40 144 864 0
43
*Mar 1 03:06:32.599: EIGRP: Packet from ourselves ignored
*Mar 1 03:06:44.263: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.4 (Vlan100) is down: Peer goodbye received
*Mar 1 03:06:44.267: Going down: Peer 1.1.100.4 total=2 stub 0
template=2, iidb-stub=0 iid-all=2
*Mar 1 03:06:44.279: EIGRP: Neighbor 1.1.100.4 went down on Vlan100
*Mar 1 03:06:44.299: EIGRP: Packet from ourselves ignored
*Mar 1 03:06:44.303: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.3 (Vlan100) is down: peer restarted
*Mar 1 03:06:44.307: Going down: Peer 1.1.100.3 total=1 stub 0
template=1, iidb-stub=0 iid-all=1
*Mar 1 03:06:44.323: EIGRP: Neighbor 1.1.100.3 went down on Vlan100
*Mar 1 03:06:45.891: EIGRP: Neighbor(1.1.100.4) not yet found
*Mar 1 03:06:45.987: EIGRP: New peer 1.1.100.4 total=2 stub 0
template=1 idbstub=0 iidball=2
SW2(config-router)#
*Mar 1 03:06:45.995: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.4 (Vlan100) is up: new adjacency
*Mar 1 03:06:46.515: EIGRP: Neighbor(1.1.100.3) not yet found
*Mar 1 03:06:46.755: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.1 (Vlan100) is down: Peer goodbye received
SW2(config-router)#
*Mar 1 03:06:46.759: Going down: Peer 1.1.100.1 total=1 stub 0
template=1, iidb-stub=0 iid-all=1
*Mar 1 03:06:46.783: EIGRP: Neighbor 1.1.100.1 went down on Vlan100
*Mar 1 03:06:46.787: EIGRP: Neighbor(1.1.100.1) not yet found
SW2(config-router)#
*Mar 1 03:06:48.831: EIGRP: Neighbor(1.1.100.1) not yet found
*Mar 1 03:06:48.863: EIGRP: Packet from ourselves ignored
*Mar 1 03:06:49.287: EIGRP: New peer 1.1.100.3 total=2 stub 0
template=1 idbstub=0 iidball=2
SW2(config-router)#
*Mar 1 03:06:49.287: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.3 (Vlan100) is up: new adjacency
SW2(config-router)#
*Mar 1 03:06:51.831: EIGRP: New peer 1.1.100.1 total=3 stub 0
template=2 idbstub=0 iidball=3
SW2(config-router)#
*Mar 1 03:06:51.835: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.1 (Vlan100) is up: new adjacency
SW2(config-router)#
*Mar 1 03:06:53.191: EIGRP: Packet from ourselves ignored
SW2(config-router)#do u all
All possible debugging has been turned off
SW2(config-router)#
*Mar 1 03:06:57.723: EIGRP: Packet from ourselves ignored
SW2(config-router)#
*Mar 1 03:07:12.023: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.3 (Vlan100) is down: Peer goodbye received
SW2(config-router)#
*Mar 1 03:07:14.991: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 10: Neighbor
1.1.100.3 (Vlan100) is up: new adjacency
SW2(config-router)#do sh ip eigrp ne
IP-EIGRP neighbors for process 10
H Address Interface Hold Uptime SRTT RTO Q
Seq
                                            (sec) (ms) Cnt
Num
1 1.1.100.3 Vl100 13 00:00:43 130 780 0
55
2 1.1.100.1 Vl100 13 00:01:06 174 1044 0
51
0 1.1.100.4 Vl100 10 00:01:12 72 432 0
57
SW2(config-router)#

Also need to know when we get the message maximum retransmission limit
exceeded what does that convey.I think each error message has got it own
meaning which will help us to isolate the problem quickly.

Pls Guide,
naufal

--- On Thu, 17/9/09, Darby Weaver <darby.weaver_at_gmail.com> wrote:

From: Darby Weaver <darby.weaver_at_gmail.com>
Subject: Re: Flapping links issue...
To: "Naufal Jamal" <naufalccie_at_yahoo.in>
Cc: ccielab_at_groupstudy.com
Date: Thursday, 17 September, 2009, 9:31 PM

Configs please.

Thanks

Darby

On Thu, Sep 17, 2009 at 5:17 PM, Naufal Jamal <naufalccie_at_yahoo.in> wrote:

Hi Experts,
I need your help.My eigrp neighborship is flapping like anything.Its a
simple
config between R6 and my BB1 router.checked the BB router no special
configuration
line over there.I am able to ping the BB router but the Q count shows>0.
and i receive "peer good-bye received" message always.I am not able to
figure
out
what could be the issue.
Can anyone suggest me a link or flow chart which we can follow for
troubleshooting
flapping links for eigrp and ospf?It will be a great help..
Naufal

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Received on Sat Sep 19 2009 - 03:57:50 ART