I always thought of a "Flap" as a generic term ....meaning when a
route/interface/serial-line goes full-circle.....regardless of protocol
i use the term interchangeably with OSPF,PpP,LEASED lines,BGP,ISDN
from:- working----down----initialising----up
i have always treated the "whole" as one flap?????
Am i going mad.....
Cheers
steve
"my mum always said ....it`s only an exam.......PAH...what the heck do she
know"
>From: "Priscilla Oppenheimer"
>Reply-To: "Priscilla Oppenheimer"
>To: [EMAIL PROTECTED]
>Subject: Re: BGP Dampening, What is a flap? [7:1128]
>Date: Wed, 18 Apr 2001 18:09:50 -0400
>
>I think from BGP's point of view a flap is a withdrawal and announcement of
>a routing prefix. Howard Berkowitz will know for sure. Did you check his
>BGP papers at http://www.certificationzone.com. Also there's a good paper
>here:
>
>http://www.ripe.net/ripe/docs/ripe-178.html
>
>Cisco often uses the word "flapping" in a generic sense for a route or
>interface going up and down repeatedly. That could be cause for some
>confusion. In your class, you might want to be clear about whether you are
>using the term generically or with reference to parameters to route
>dampening commands.
>
>Good luck. Let us know what you find out for sure! Thanks.
>
>Priscilla
>
>At 03:35 PM 4/18/01, Tom Pruneau wrote:
> >Greetings All
> >
> >I am in the process of writing a BGP class, at present I am specifically
> >working on a section covering dampening.
> >
> >My question is "what is a flap"
> >
> >The two possible answers are:
> >
> >
> >Answer one
> >A flap is whenever path information changes for a route. By this
>definition
> >if a route goes away, that would be a flap. When the route comes back,
>that
> >would be another flap.
> >So a route going away then coming back would be 2 flaps.
> >
> >
> >Answer two
> >A flap is a route transition from up to down back to up. So a route going
> >away then coming back would count as one flap.
> >
> >
> >
> >I am mucking with this in my lab and the lab would seem to indicate that
> >answer two is the correct one, but when I read the Sam Halabi copyright
> >1997 internet routing architectures book, page 440 and 441 it says the
> >answer is Answer one.
> >
> >I am at best confused
> >
> >Any help?
> >Tom Pruneau
> >Trainer Network Operations
> >
> >GENUITY
> >3 Van de Graff Drive Burlington Ma. 01803
> >24 Hr. Network Operations Center 800-436-8489
> >If you need to get a hold of me my hours are 8AM-4PM ET Mon-Fri
> >
>
>---------------------------------------------------------------------------
> >This email is composed of 82% post consumer recycled data bits
>
>---------------------------------------------------------------------------
> >
> >"Once in a while you get shown the light
> >in the strangest of places if you look at it right"
> >FAQ, list archives, and subscription info:
> >http://www.groupstudy.com/list/cisco.html
> >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
>________________________
>
>Priscilla Oppenheimer
>http://www.priscilla.com
>FAQ, list archives, and subscription info:
>http://www.groupstudy.com/list/cisco.html
>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=1194&t=1128
--------------------------------------------------
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
