[c-nsp] 7500 slot configuration

[rafi-cnsp2 at meron.openu.ac.il]

On Tue, 14 Mar 2006, Rodney Dunn wrote:

> Date: Tue, 14 Mar 2006 10:59:10 -0500
> From: Rodney Dunn <rodunn at cisco.com>
> To: David Coulson <david at davidcoulson.net>
> Cc: cisco-nsp <cisco-nsp at puck.nether.net>
> Subject: Re: [c-nsp] 7500 slot configuration
> 
> I've never seen it matter in the real world.

1) IIRC what can be a problem in the real world is the cbus utilization
the "real world" cybus capacity is around 600 Mb/sec
(that is on a 7513 router with all VIP4 it may be less with VIP2)
so splitting the cards in order to load share between the 2 buss
is probably a good idea

2) Also AFAIK the GEIP is based on the VIP2/50 - so you'll probably hit a 
performance wall if your input+output traffic significantly exceeds 300Mb/sec 
for one of the GEIP or for that matter any single slot since you're 
using VIP2/50s for the other slots - in particular 2*T3+FE in one VIP is 
pushing it

-- 
HTH,
  	Rafi


>
> btw, you can't have a VIP with no PA in it.
>
> Rodney
>
>
> On Tue, Mar 14, 2006 at 10:49:49AM -0500, David Coulson wrote:
>> 	I've got a couple of 7507s here, which are going to end up with
>> identical configs.
>>
>> 2x RSP4
>> 2x GEIPs
>> 1x VIP2-50 w/ PA-MC-T3
>> 1x VIP2-50 w/ PA-2T3 + PA-FE
>> 1x VIP2-50 w/ nothing
>>
>> My question is this. I know the 7500s have a bus on slots 0+1 and slots
>> 4+5+6, however I'm trying to figure out if there is a performance hit
>> going between the two buses. My first thought is to put all the active
>> hardware in 4+5+6 (GEIP+MC-T3+2T3/FE), so it's on the same bus, and the
>> backup stuff in 0(GEIP), however I'm unsure if this is the best way to
>> go.
>>
>> So, does it even matter where cards go in these routers? If so, what's
>> the best way to organize it?
>>
>> David
>>
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