[c-nsp] VSS question...

[Matlock, Kenneth L]

Last I had heard, the IOS code can only understand 2 supervisors total. Meaning you have an active and a standby, and that's it. So you have 1 supervisor in each chassis total. There is no current concept of an active, and multiple 'hot' standby supervisors.
 
That (among other things) made us decide not to do VSS, although having portchannels span multiple 6500's was an attractive feature....
 
And keep in mind that for VSS, you're looking at the Sup720-10G supervisors, and the WS-X6708 cards for the links between VSS pairs (sure, you can get away with just the links on the supervisors, but you have a huge single point of failure).
 
Ken Matlock
matlockk at exempla.org
Network Analyst
Exempla Healthcare
(303) 467-4671

________________________________

From: cisco-nsp-bounces at puck.nether.net on behalf of Jeff Kell
Sent: Tue 7/28/2009 8:06 PM
To: 'NSP List'
Subject: [c-nsp] VSS question...



Excuse the naive question, just starting to look at VSS and trying to
tune to the concept...

For those of you that have dived into VSS...  are you still doing
redundant supervisors per chassis?  or just duplicating links on each
chassis and crossing your fingers?

I've done the 3750 stacks and perhaps locked my thinking into designing
with a complete chassis failure being "tolerable" in the end design. 
Does this scale up to VSS, or just a matter of how many ports can you
afford to drop?

Jeff
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