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Why 2 interface are used in stackwise virtual link

In Stackwise Virtual Link on 3850 XS. We use 2 interface on both the Switches for configuring Stackwise Virtual Link and 1 interface for Dual Active Detection. Can Any 1 explain why 2 interface are configured in this stacking system?

If we configure only 1 interface as Stackwise Virtual will stack work?

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marce1000
VIP Mentor VIP Mentor
VIP Mentor

 

 Ref : https://www.cisco.com/c/dam/en/us/products/collateral/switches/catalyst-3850-series-switches/q-and-a-c67-738577.pdf

 >...

 Q What are SVL best practices and
recommendations?
A Following are recommended Cisco SVL best practices:
  >...
            • Minimum of two SVL connections are recommended for
            better redundancy and load sharing.
 >....

 M.

View solution in original post

balaji.bandi
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VIP Guru

YES / NO - single should work, that is not best practice, if that link break you have split brain scenario, so suggest always SVL should 2 Link along with 1 DAD link. that is the best practice, unofficially you can do many ways, that is not supported.

 

BB

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View solution in original post

4 Replies 4

marce1000
VIP Mentor VIP Mentor
VIP Mentor

 

 Ref : https://www.cisco.com/c/dam/en/us/products/collateral/switches/catalyst-3850-series-switches/q-and-a-c67-738577.pdf

 >...

 Q What are SVL best practices and
recommendations?
A Following are recommended Cisco SVL best practices:
  >...
            • Minimum of two SVL connections are recommended for
            better redundancy and load sharing.
 >....

 M.

balaji.bandi
VIP Guru VIP Guru
VIP Guru

YES / NO - single should work, that is not best practice, if that link break you have split brain scenario, so suggest always SVL should 2 Link along with 1 DAD link. that is the best practice, unofficially you can do many ways, that is not supported.

 

BB

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How to Ask The Cisco Community for Help

In case DAD not configured what will be the effect?

balaji.bandi
VIP Guru VIP Guru
VIP Guru

DAD itself give self explanatory, Dual Active Detection - this detects if both go active and take action.

As i mentioned in the original, as long as there i no Link break in theory all should work expected.

 

But in real world we can not take as risk even .1% - so suggest always best practice as suggested.

 

BB

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