[54224] in North American Network Operators' Group
EIGRP / OSPF dampening
daemon@ATHENA.MIT.EDU (Donn Lasher)
Tue Dec 17 20:06:09 2002
Date: Tue, 17 Dec 2002 18:02:48 -0700
To: nanog@nanog.org
From: Donn Lasher <dlasher@clearskynet.net>
In-Reply-To: <OF9390B07D.C0C6FF1C-ON80256C8D.00379296-80256C8D.0037F737@
radianz.com>
Errors-To: owner-nanog-outgoing@merit.edu
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...
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..
