VSS VSL using both Sup720's in a quad-sup configuration

[John Comfort]

All the design documentation refers to three design recommendations:

1. VSL bundle over Supervisor port(s)

2. VSL bundle over Supervisor port and a linecard (distributed VSL)

3. VSL bundle over two linecards (distributed VSL)

I have a situation that uses a quad-sup configuration. I plan on configuring the VSL bundle to incorporate all four of the available Supervisor720 links. Is this a recommended configuration?

Thank you.

[Amit Singh]

Hi John,

You can certainly do that. The topologies mentioned in your post are beofre the quad sup support but still exists. You need an extra line card link for VSL if you want to add another redundant layer which you would not want with quad sup.

Please see the Quad sup VSL design white paper below.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps9336/white_paper_c11_429338.pdf

Also see the VSS config guide.

http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/vss.html

HTH, Please rate if it does.

Cheers,

-amit singh

[John Comfort]

None of the documentation specifically states that you should or shouldn't use BOTH ports on BOTH supervisors.

John

[Amit Singh]

Yes, but the documentation only takes minimum 1 port from each sup for the VSL link. That doesnot mean that you can only use 1 port from each sup engine, that's just the minimum configurtion. You can certainly use all the ports avialble for the VSL as all the ports are in forwarding state in dual sup scenario on a Cat6500 chassis. I have also designed the same for one of my customer, i am awaiting the deployment but it should work.

Cheers,

-amit singh

[Rahul Kachalia]

VSL design for VSS Quad-sup is documented in following CVD (See chapter 2):

http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/Borderless_Campus_Network_1.0/Borderless_Campus_1.0_Design_Guide.pdf

thanks,

rahul.