11-29-2013 11:15 PM - edited 03-07-2019 04:51 PM
Dear All,
I have two sup2T, one in each 6500E chassis. I need to understand about portchannel for VSL. I have seen some configuration with one portchannel for both 10G link as a singal VSL and some configuration with two different portchannel with two VSL. So what is the recommended configuration and advantage.
Thank You,
Abhisar.
Solved! Go to Solution.
11-30-2013 07:56 AM
Abishar
You are right when you say generally you use the same port channel number on both ends of an etherchannel link. But that is with standalone switches. The key thing with VSS is that the config from both switches is merged into one configuration fille.
So if you configured switch 1 with port channel 1 then how can you configure switch 2 with port channel 1 as well because when the configs are merged you now have two port channels using the same number.
Jon
11-30-2013 08:14 AM
Hi Jon, Abishar
You guys are both correct.
This is the only case that portchnnel numbers are different. For switch-1 po1 and for switch-2 po2. I know, it is confusing, as people think they are building 2 different portchannels, but in actuality it is one with 2 different numbers.
When you build your portchannles from the access switches to your VSS pair, they can use the same number on both sides just like any other portchannel.
HTH
11-30-2013 08:05 AM
From the Campus Design Guide document -
The VSL bundle is a special-purpose port channel. Each standalone switch is required to be configured with unique port-channel interface numbers; before assigning a port-channel number, you must make sure that the port-channel interface number is not used by an existing standalone configuration on either switch.
full link -
http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/VSS30dg/VSS-dg_ch2.html
Jon
11-30-2013 08:45 AM
Dear Jon/Reza,
Now its clear to me :). Also, document was helpful.
Thank you Guys.
Abhisar.
12-01-2013 12:59 AM
Dear Jon/Reza,
Addtion to this, what I understood is, VSS is for SUP engine. In case my line card fail on one chassis, I should have other connectivity for redundancy.
As I have two firewalls in failover, so I will be connecting this two firewall to different chassis.
ex. Active FW port to Gi1/3/1 and Passive FW port to Gi2/3/1. Both ports will be in same vlan and I will create one L3 vlan interface which will be gateway for firewalls.
Thank You,
Abhisar.
12-01-2013 07:13 AM
Abishar
Yes, you want your firewalls connected to different chassis in case -
1) the supervisor fails in one of the chassis in which case all linecards/modules in that chassis will be unavailable
or
2) the linecard the firewall is connected to fails
You would set it up exactly as you have described.
Jon
12-01-2013 07:21 AM
Dear Jon,
Thank you to confirm the same
Thank You,
Abhisar.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide