[99199] in North American Network Operators' Group
Re: Route table growth and hardware limits...talk to the filter
daemon@ATHENA.MIT.EDU (Mark Tinka)
Sun Sep 9 10:01:35 2007
From: Mark Tinka <mtinka@globaltransit.net>
Reply-To: mtinka@globaltransit.net
To: "Alex Rubenstein" <alex@corp.nac.net>
Date: Sun, 9 Sep 2007 21:58:57 +0800
Cc: nanog@nanog.org
In-Reply-To: <1DDD4A8C38E96A42B93D0E1677DE30082BAFEF@store1.hq.nac.net>
Errors-To: owner-nanog@merit.edu
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On Sunday 09 September 2007 21:30, Alex Rubenstein wrote:
> If BGP is an incremental protocol (which of course, I
> know it is), why doesn't a certain vendor treat it that
> way?
>
> *cough* BGP Scanner *cough*.
Interesting you should mention this as we are planning to=20
test an "improvement" to the BGP Scanner process, BGP=20
Support for Next-Hop Address Tracking.
Some notes from the vendor:
"The BGP Support for Next-Hop Address Tracking feature is=20
enabled by default when a supporting Cisco IOS software=20
image is installed. BGP next-hop address tracking is event=20
driven. BGP prefixes are automatically tracked as peering=20
sessions are established. Next-hop changes are rapidly=20
reported to the BGP routing process as they are updated in=20
the RIB. This optimization improves overall BGP convergence=20
by reducing the response time to next-hop changes for=20
routes installed in the RIB. When a bestpath calculation is=20
run in between BGP scanner cycles, only next-hop changes=20
are tracked and processed."
How much of an improvement this will make is what we are=20
hoping to find out.
Cheers,
Mark.
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