North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Survey on IBGP persistent route oscillation problem
> 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. It's actually quite trivial to identify. Have a look at: http://www.cisco.com/warp/public/770/fn12942.html Juniper syntax would result in the same.. > 1. How many time do our operator really find and affected by the > problem depicted in draft-ietf-idr-route-oscillation-01.txt I know of more than a few, and would bet that if additional folks took the time to look, they'd realize it was occurring as well. > 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. Nope. Dampening doesn't resolve this because it occurs intrA-domain. > 3. Anyone see oscillation been magnified when injected > into RR (cluster structure) ? Not sure I understand what you mean by "magnified"? Have a look at the Cisco FN, it's useful in understanding and identifying the problem. -danny
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