[c-nsp] bgp scalability C7600

[Blake Dunlap]

Just so you know, my first thought when you said this was "run away"...

I'd be very hesitant to use anything in the NX platform as a
replacement for administrative domain boundaries in a network without
really knowing what I was doing.

-Blake

On Fri, Feb 6, 2015 at 11:56 AM, james list <jameslist72 at gmail.com> wrote:
> Hi gert
> Good info.
>
> From customer requirements and  pricing point of view the idea is to
> replace with a nexus.
>
> Regards
> Il 06/feb/2015 19:45 "Gert Doering" <gert at greenie.muc.de> ha scritto:
>
>> Hi,
>>
>> On Fri, Feb 06, 2015 at 03:16:26PM +0100, james list wrote:
>> > do anybody have numbers in terms of BGP sessions scalability oin C7600
>> > SUP-720 ?
>>
>> "not that great"...
>>
>> Ours at DE-CIX has a handful of iBGP sessions and about 150 eBGP sessions
>> to IXP participants, and if that interface flaps, it will hickup for
>> about *1 hour* until everything is stable again.
>>
>> Effectively it depends on
>>
>>  - number of sessions
>>  - number of prefixes on each session ("10 each" or "50.000")
>>  - how complicated your inbound and outbout policy is
>>     (our policy is slightly too complicated, with as-path matches which
>>      are not exactly performance efficient)
>>  - whether peers can be grouped into update-groups (= same export policy)
>>  - keepalive timers your peers have configured
>>     (the main issue is "CPU busy -> keepalives not answered in time ->
>>      session bouncing -> more CPU busy", which is made worse by short
>>      keepalive timers)
>>
>> We're not deploying Sup720s for anything with "lots of BGP" anymore, and
>> the box in question will be replaced with an ASR9001 any day now, which
>> is just laughing its NPUs off on that BGP load... ("BGP convergence in 30
>> seconds.  done.  anything more interesting to do?  Any slow peer I could
>> nuke with outgoing updates sent over too fast for it?").
>>
>> gert
>> --
>> USENET is *not* the non-clickable part of WWW!
>>                                                            //
>> www.muc.de/~gert/
>> Gert Doering - Munich, Germany
>> gert at greenie.muc.de
>> fax: +49-89-35655025
>> gert at net.informatik.tu-muenchen.de
>>
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