IPX EIGRP holding tim eexpire

Unanswered Question

hello all,

I notice looging in the log of 6513 core the following errors:

Jul 16 09:37:39.481 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 1D113.00

0e.d665.d9fc (Vlan113) is down: holding time expired

Jul 16 09:37:54.817 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 1D150.00

0e.d665.d9fc (Vlan150) is down: holding time expired

Jul 16 09:37:59.969 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 1D171.00

0e.d665.d9fc (Vlan171) is down: holding time expired

Jul 16 09:38:04.485 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 1D172.00

0e.d665.d9fc (Vlan172) is down: holding time expired

Jul 16 09:38:06.257 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 1D173.00

0e.d665.d9fc (Vlan173) is down: holding time expired

Jul 16 09:38:10.933 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 1D174.00

0e.d665.d9fc (Vlan174) is down: holding time expired

Jul 16 09:38:39.481 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 6023.000

e.d665.d9fc (Vlan214) is down: holding time expired

Jul 16 09:38:41.949 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 1D216.00

0e.d665.d9fc (Vlan216) is down: holding time expired

Jul 16 09:38:48.465 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 1D240.00

0e.d665.d9fc (Vlan240) is down: holding time expired

Jul 16 09:38:59.481 extende: %DUAL-5-NBRCHANGE: IPX-EIGRP 767: Neighbor 6254.000

e.d665.d9fc (Vlan254) is down: holding time expired

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Richard Burts Mon, 07/16/2007 - 07:52
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Mohamed


As you probably know EIGRP sends hello messages to each neighbor and expects to receive hello messages from the neighbors as a mechanism to verify that communication between neighbors is still valid. If EIGRP does not receive hello messages from a neighbor it has a timer (holding time) which it uses to determine how long to wait for a message from the neighbor before deciding that the neighbor is down. You have a bunch of neighbors on a bunch of interfaces from which you have not received hello messages and the holding time is expiring.


HTH


Rick

Richard Burts Mon, 07/16/2007 - 08:25
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Mohamed


I do not yet know enough about your environment to be able to advise you whether to reconfigure the EIGRP timers. Was this an isolated event or does it do this frequently? Was there some loss of connectivity to parts of the network where these neighbors are?


In general I am in favor of leaving the EIGRP timers at their default values. I did discover on a group of routers that were running IPSec VPN with GRE over the Internet, that we were having a noticeable amount of EIGRP neighbor instability. I did reconfigure the EIGRP timers to longer values and did find that it improved neighbor stability.


HTH


Rick

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