VSS with two SUP2T in each Chassis

[mohammad saeed]

Hi Guys,

I have two 6509 chassises and every chassis has 2 sup2t card and I want to configure VSS for that!

Do i need to connect all Sup2t with each other or just 1 sup2t from each chassis is enough?

Thanks

mohammad

[Reza Sharifi]

Hi,

You can use 2 links from the same sup for each chassis.

Have a look at figure 11-6 in this link for more info.

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-2SY/config_guide/sup2T/15_2_sy_swcg_2T/virtual_switching_systems.pdf

HTH

[mohammad saeed]

So doesn't needed to take 4 links between two chassis? and there is not benefits for that?

Thanks

[Reza Sharifi]

You can but you don't have to. The benefit comes in fail-over and uptime. I personally like VSS when you have one sup in each chassis as having 2 sups in each chassis makes things more complicated but that is just me. Here is a good white paper discussing the concept.

https://www.cisco.com/c/dam/en/us/products/collateral/interfaces-modules/network-modules/white_paper_c11_429338.pdf

HTH

[mohammad saeed]

So will not increase the throughput and capacity of whole chassis?

[Reza Sharifi]

No, not really. Both chassis will forward traffic regardless of how many sup you have in each chassis. When you have a second sup in each chassis, it will be on stand-by anyway.  The link I posted is good at explaining the concept.

HTH