[c-nsp] 3750 stack

[Alexander Clouter]

Bøvre Jon Harald <Jon.Harald.Bovre at hafslund.no> wrote:
> 
> We have a number of 3750 stacks with anything from 2 to 8 switches.
> 
> Our standard when configuring new stack:
> First switch numbered 9, second switch numbered 8
> Switch # 9 given priority 15 (highest)
>
Interesting, Cisco told us it is generally a bad idea going much above 
five switch stacks.  Something to do with the fact that at the rear of 
the switch you have a token ring-esque system and 40Gbps of backplane 
(off the top of my head).  In the early code they only had a single 
token flying around the switches which caused horrible latency woes I 
would imagine, but things improved when they had multiple tokens 
rotating through the loop.

Either way, I also thought when an 'interesting' decision had to be made 
traffic had to be punted upto the master switch and back down.  
Obviously the longer the chain the worse *everything* gets.

However I doubt our users would actually notice.  Any reason you do not 
split your stack in half?  Only curious.
 
Cheers

-- 
Alexander Clouter
.sigmonster says: BOFH excuse #330:
                  quantum decoherence