VSS - Virtual Switch Domain Uniqueness Doubt

[lomonaco]

Hi everyone,

In the Cisco documentation, says that

You must configure the same virtual switch domain number on both switches of the VSS. The virtual switch domain is a number between 1 and 255, and must be unique for each VSS in your network.

My doubt is how can I understand the word network ?

I cannot use the same Virtual Switch Domain in a L2 Network, in a L3 Network, in a same customer Network ?

For example, if a customer has a lot of sites connected by a MPLS Wan, can I reuse the Virtual Switch Domain in each site ?

Thanks for Advanced

Andre Gustavo

[nspasov · Accepted solution]

You can re-use the virtual domain ID as long as the the two VSS chassis are not directly connecting to each other. Take a look at this link:

VVirtual Domain

Defining the domain identifier (ID) is the first step in creating a VSS from two physical chassis. A unique domain ID identifies two switches that are intended to be part of the same VSS pair that defines the VSS domain. Assignment of a domain ID allows multiple virtual switch pairs to be connected in a hierarchical manner. Only one VSS pair can participate in a particular domain. The domain ID can have a value ranging from 1 to 255 and must be unique when multiple VSS pairs are connected together. See Figure 2-2.

Figure 2-2 VSS Domain IDs

http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Campus/VSS30dg/campusVSS_DG/VSS-dg_ch2.html

Hope this helps!

Thanks you for rating useful posts! 

[Reza Sharifi · Accepted solution]

Hi,

This basically means if you have a set of switches (VSS) and if they are in domain 10, and if you need a second set of switches (VSS) to connect to the first set, give it a different domain id (20).  If the 2 domains are not directly connected together, you can reuse the same domain id again.

HTH