From: ccie2be (ccie2be@nyc.rr.com)
Date: Mon Dec 22 2003 - 14:39:33 GMT-3
Thanks, I had no idea. What will those IOS writers think of next?
dt
----- Original Message -----
From: "Brian Dennis" <bdennis@internetworkexpert.com>
To: "'ccie2be'" <ccie2be@nyc.rr.com>; "'Group Study'"
<ccielab@groupstudy.com>
Sent: Monday, December 22, 2003 12:26 PM
Subject: RE: Flapping interface
> You might look into IP event dampening.
>
> Rack1R4#sho ver | in IOS
> IOS (tm) C2600 Software (C2600-J1S3-M), Version 12.2(15)T5, RELEASE
> SOFTWARE (fc1)
> Rack1R4#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> Rack1R4(config)#int e0/0
> Rack1R4(config-if)#dampening ?
> <1-30> Half-life time for the penalty
> <cr>
>
> Rack1R4(config-if)#dampening
> Rack1R4(config-if)#^Z
> *Mar 2 18:02:01.473: %SYS-5-CONFIG_I: Configured from console by console
> Rack1R4#debug dampening all
> Dampening all debugging is on.
>
> Rack1R4#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> Rack1R4(config)#int e0/0
> Rack1R4(config-if)#shut
> *Mar 2 18:02:21.322: IF-EvD(Ethernet0/0): IP Routing reports state
> transition from UP to DOWN
> *Mar 2 18:02:21.322: EvD(Ethernet0/0): accum. penalty decayed to 0 after
49
> second(s)
> *Mar 2 18:02:21.322: EvD(Ethernet0/0): charge penalty 1000, new accum.
> penalty 1000, flap count 3
> *Mar 2 18:02:21.326: EvD(Ethernet0/0): accum. penalty 1000, not
suppressed
> *Mar 2 18:02:21.326: IF-EvD(Ethernet0/0): update IP Routing state to
DOWN,
> interface is not suppressed
> Rack1R4(config-if)#no shut
> Rack1R4(config-if)#
> *Mar 2 18:02:23.333: IF-EvD(Ethernet0/0): IP Routing reports state
> transition from DOWN to UP
> *Mar 2 18:02:23.333: IF-EvD(Ethernet0/0): update IP Routing state to UP,
> interface is not suppressed
> *Mar 2 18:02:24.335: IF-EvD(Ethernet0/0): IP Routing reports state
> transition from UP to UP
> Rack1R4(config-if)#
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie2be
> Sent: Monday, December 22, 2003 9:08 AM
> To: Group Study
> Subject: Flapping interface
>
> Hi,
>
> How do I make a router disable an unstable interface until the interface
> becomes stable? I have a practice lab requirement to do this but BGP
isn't
> involved. I know that I can use route dampening with BGP, but how do I
> accomplish essentially the same thing if BGP isn't part of the equation?
>
> Thanks in advance, dt
>
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