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:

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


We have a similar situation (RR + always-compare-MED off), and the BGP table
version keeps changing at 1K/min ( 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
     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.


Yu Ning

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.