Survey on IBGP persistent route oscillation problem

Thu Mar 21 16:42:46 UTC 2002

Yu Ning:

Thank you for the additional questions.  I'll be glad to
gather the additional information from the people
who are responding to me.

I'll publish the summary of the answers.

Sue

At 05:00 PM 3/21/2002 +0800, Yu Ning wrote:

>Hi,
>
>We have a similar situation (RR + always-compare-MED off), and the BGP table
>version keeps changing at 1K/min (http://performance.cn.net:2003/). I
>suspect some
>route meet the criteria of IDR-oscillation draft. But in real world, it's
>very hard to pick
>  up the pattern depicted in the draft from a huge log of debug bgp output.
>
>After several sample from the huge bgp log, I have the following questions:
>
>1.  How many time do our operator really find and affected by the problem
>depicted
>      in  draft-ietf-idr-route-oscillation-01.txt   £¿
>
>2. From my experience, most flapping seems to be oscillation route which
>escaped the
>      eBGP damping protection. And for this, we need adjust damping
>parameters from
>      RIPE 220 to make up.
>
>3.   Anyone see oscillation been magnified when injected into RR (cluster
>structure) ?
>
>
>4. What's the typical bgp table change rate within your network ? From my
>observation at
>    the major global looking glass, should be  below 0.5K/min with some
>accidental surge.
>
>
>
>regards,
>
>Yu Ning
>______________________________________
>
>(Mr.) Yu Ning, Chief Engineer
>ChinaNET (AS4134) Senior Support
>Internet Dep. DCBU, China Telecom
>Beijing, P.R.China +86-10-62072357
>Personal Page-> http://navidog.126.com
>______________________________________
>
>|-----Original Message-----
>|From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu]On
>|Behalf Of Susan Hares
>|Sent: Wednesday, March 20, 2002 8:23 PM
>|To: nanog at merit.edu
>|Subject: Survey on IBGP persistent route oscillation problem
>|
>|
>|
>|
>|
>|IBGP and Persistent Route Oscillation
>|
>|The Draft BGP Persistent Route Oscillation draft describes route
>|oscillation occurring in networks today.   This draft can be obtained at:
>|
>|http://www.ietf.org/internet-drafts/draft-ietf-idr-route-oscillation-01.txt
>|
>|In order to evaluate how significant a problem the route oscillation is, I
>|would like to get input from network operators.   If you could take a few
>|moments and fill out this survey, it would help in determining the
>|severity
>|of the problems.   Any information solicited by this survey will remain
>|private.   Summaries of this information will be sent to this list and the
>|IDR working list.
>|
>|
>|Sue Hares
>|IDR co-chair
>|