[54225] in North American Network Operators' Group
Re: EIGRP / OSPF dampening
daemon@ATHENA.MIT.EDU (Eric Osborne)
Tue Dec 17 22:36:48 2002
Date: Tue, 17 Dec 2002 22:36:03 -0500
From: Eric Osborne <eosborne@cisco.com>
To: Donn Lasher <dlasher@clearskynet.net>
Cc: nanog@nanog.org
In-Reply-To: <5.1.1.6.0.20021217175624.00b75df8@mail.clearskynet.net>; from dlasher@clearskynet.net on Tue, Dec 17, 2002 at 06:02:48PM -0700
Errors-To: owner-nanog-outgoing@merit.edu
On Tue, Dec 17, 2002 at 06:02:48PM -0700, Donn Lasher wrote:
>
>
> I'm looking for a way to way to either dampen, penalize, or otherwise slow
> down a flapping interface, when the router has no "link state" information
> about the Layer 2 connection, which is itself causing the flap... Example...
http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a00800ad25b.html
Like BGP dampening, but more generic. Does that do what you want?
eric
>
> Dec 17 08:23:50 xxx.xxx.xxx.xxx 2106: 15w5d: %DUAL-5-NBRCHANGE: IP-EIGRP
> 10: Neighbor xxx.xxx.xxx.xxx (FastEthernet2/0.3) is down: peer restarted
> Dec 17 08:23:52 xxx.xxx.xxx.xxx 2107: 15w5d: %DUAL-5-NBRCHANGE: IP-EIGRP
> 10: Neighbor xxx.xxx.xxx.xxx (FastEthernet2/0.3) is up: new adjacency
> Dec 17 08:24:09 xxx.xxx.xxx.xxx 2108: 15w5d: %DUAL-5-NBRCHANGE: IP-EIGRP
> 10: Neighbor xxx.xxx.xxx.xxx (FastEthernet2/0.3) is down: peer restarted
> Dec 17 08:24:11 xxx.xxx.xxx.xxx 2109: 15w5d: %DUAL-5-NBRCHANGE: IP-EIGRP
> 10: Neighbor xxx.xxx.xxx.xxx (FastEthernet2/0.3) is up: new adjacency
> Dec 17 08:24:42 xxx.xxx.xxx.xxx 2110: 15w5d: %DUAL-5-NBRCHANGE: IP-EIGRP
> 10: Neighbor xxx.xxx.xxx.xxx (FastEthernet2/0.3) is down: peer restarted
> Dec 17 08:24:43 xxx.xxx.xxx.xxx 2111: 15w5d: %DUAL-5-NBRCHANGE: IP-EIGRP
> 10: Neighbor xxx.xxx.xxx.xxx (FastEthernet2/0.3) is up: new adjacency
> Dec 17 08:25:18 xxx.xxx.xxx.xxx 2112: 15w5d: %DUAL-5-NBRCHANGE: IP-EIGRP
> 10: Neighbor xxx.xxx.xxx.xxx (FastEthernet2/0.3) is down: peer restarted
> Dec 17 08:25:20 xxx.xxx.xxx.xxx 2113: 15w5d: %DUAL-5-NBRCHANGE: IP-EIGRP
> 10: Neighbor xxx.xxx.xxx.xxx (FastEthernet2/0.3) is up: new adjacency
>
> This type of flapping yields an effectively down interface, yet, appears
> "up" so data gets blackholed while dead timers expire, etc.
>
> I'm very familar with doing this via BGP, but haven't found any good way
> yet to do this with either EIGRP or OSPF.
>
> Any ideas? Feel free to either reply to the list, or privately.
>
> Thanks in advance..
