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..
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_guid... 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..
participants (2)
-
Donn Lasher -
Eric Osborne