[c-nsp] 6500 VSS question

[Church, Charles]

Phil,

	The VSS is the 'bonding' of 2 6500 chassis into one, with one CLI
controlling both chassis.  Kind of like a 3750 stack.  Up until I think
SXI3, you were limited to one sup in each chassis.  One sup would be elected
the active, and the other would be the hot standby, like normal SSO, but
split between chassis.  With SXI3 or 4, you can add a second sup into each
chassis.  These sups backup the other sup in that chassis.  The additional
sups take the role of RPR warm.  Each chassis can have at most 1 sup as
either active or hot-standby, and the other sup if up will be RPR warm.  If
your active sup is lost, the hot-standby (in other chassis) transitions to
active, and the backup sup in the chassis which just lost the active sup
will transition from RPR-warm to hot-standby.  The VSS link exists between
the two chassis to act almost like a backplane, carrying some traffic, but
also state info, and other things you might find on the backplane.

Chuck Church


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Phil Mayers
Sent: Tuesday, May 17, 2011 12:39 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 6500 VSS question

On 17/05/11 16:31, Church, Charles wrote:
> Anyone?  Otherwise gonna ask TAC, just want to verify my thoughts.

I know nothing much about VSS, but I see a couple of confusing aspects 
in your email; you refer to instant failover (which is SSO), RPR+ and eFSU.

Can you elaborate on the exact sequence of events, and what the standby 
state of the other nodes and SUPs was at each point?
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