I think you're mixing two aspects of the equation:
- quad-sup SSO is meant to guarantee full uptime redundancy of the full VSS pair and assure no chassis loss in case of a single sup failure.
- dual-active detection is meant to guarantee that if the VSL link across the VSS members goes down, isolating the boxes, (but they are still impersonating a single entity ) one of the boxes "removes" itself from the network in order to avoid network issues related to dessynchronisation of state on these two boxes, towards the rest of the network.
That said, you do not need to place the dual active detection link on the supervisors (it can be on any linecard), as its purpose is only to serve as a redundant link for detection in case the VSL goes down.
Unlike the peer-keepalive link in Nexus, you do not need to have a dual-active detection method enabled to form the VSS pair, so the use case for having it redundant is, frankly, quite debatable...
Im my view, I'd use one link on a separate linecard from the VSL links. I don't really see the need for both links across chassis, and especially not within the same chassis. The situation where you have your VSL link down (4 links) and your dual-active detection link is also down is extremelly unlikely with a single link.
Are the boxes located in different rooms, or is there any significative distance that would heighten the probability of this situation to occur?
For me i have aready a switch 6509 sup 2 in my network.it's aready configured for network interconnection.For now, i want to add an other 6509 sup 2t with the first in vss.Can you please give me the steps for configure vss.Also,we can help me for upgrade a switch with 2 supervisor.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...