Stackwise virtual domain

[suneq]

Hi,

I have a basic question regarding the StackWise Virtual domain. I read the whitepaper below

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9000/nb-06-cat-9k-stack-wp-cte-en.html#MultipleStackWiseVirtualdomains

and found that "Cisco requires that you use unique virtual switch domain ID for each pair of SVL switches" but I did not see any explanation why we should do that.

I used to work with VSS technology and understand that the VSS domain ID is encoded in the virtual MAC and therefore if we connect 2 VSS domain with the same ID, we will have a problem.

Does Stackwise Virtual work the same way?

Thanks. 

[balaji.bandi]

Threre is one cisco Live presentation i can not recall the document name, i will post once i find it.

Virtual Stackwise extension of VSS. it broadcasts the domain ID out which can cause issues with duplicate domains - when you join 2 SVL with same domain ID, this has more difficulties to diagnosis the issue when you have Layer 2 issues.

cisco always suggest to to have unique from 1-255 any number.