[c-nsp] 7500 slot configuration

[dave oleary]

At 01:13 PM 3/14/2006, jp wrote:
>If the last vip is a spare, I'd keep it out too. If you lose a router
>due to a surge or loss-of-blue-smoke, the vip will be much safer in a
>static bag on a shelf.
>
>I think, but am not certain, that the buses on each side of the RSPs are
>seperate. How data gets between the cybuses, I don't know, and it's a
>good question . It would be best to have the highest traffic devices on
>the same bus, (or in the same VIP if they will fit).

unless something has really changed with the architecture in the
last few years, the same bus vs. different bus doesn't matter.
All the packets still go through the RSP.
Most (all?) of the VIPs do local switching for most packets between
interfaces on the same VIP (unless they need special handling),
but otherwise it is across the bus twice for each packet - into
memd and out of memd to the egress VIP.

                                         dave

>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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>--
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>     KB1IOJ        |  Hosting, and TCP-IP Networks for Midcoast Maine
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