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.
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.