[c-nsp] BGP convergence with jumbo frames

[Tomas Daniska]

just got this update:

http://www.cisco.com/warp/partner/synchronicd/cc/pd/iosw/iore/iomjv122/p
rodlit/2533_pp.htm

12.2.18SXD, amongst others claims optimized BGP convergence... maybe
worth trying?

--

deejay  

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Tantsura, Jeff
> Sent: Monday, August 02, 2004 8:52 AM
> To: Pete Kruckenberg; cisco-nsp at puck.nether.net
> Subject: RE: [c-nsp] BGP convergence with jumbo frames
> 
> 
> IP MTU ?
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Pete 
> Kruckenberg
> Sent: Monday, August 02, 2004 7:42 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] BGP convergence with jumbo frames
> 
> Spent some time recently trying to tune BGP to get convergence down as
> far as possible. Noticed some peculiar behavior.
> 
> I'm running 12.0.28S on GSR12404 PRP-2.
> 
> Measuring from when the BGP session first opens, the time to transmit
> the full (~128K routes) table from one router to another, across a
> jumbo-frame (9000-bytes) GigE link, using 4-port ISE line cards (the
> routers are about 20 miles apart over dark fiber).
> 
> I noticed that the xmit time decreases from ~ 35 seconds with 
> a 536-byte
> MSS to ~ 22 seconds with a 2500-byte MSS. 
> >From there, stays about the same, until I get to 4000, when
> it beings increasing dramatically until at 8636 bytes it takes over 2
> minutes.
> 
> I had expected that larger frames would decrease the BGP converence
> time. Why would the convergence time increase (and so 
> significantly) as
> the MSS increases?
> 
> Is there some tuning tweak I'm missing here?
> 
> Pete.
> 
> 
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