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How To Configure MSTP on Securestacks and S-Series to allow for differnt Root Bridges for Different VLANS?

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TitleHow To Configure MSTP on Securestacks and S-Series to allow for differnt Root Bridges for Different VLANS?
Objective
Configure two different root bridges in MSTP, so that different VLANs can block in different places. This is useful for load balancing or in situations where two root bridges are desired because of traffic patterns.
Environment
  • S-Series
  • Securestack
Procedure
1. Configure the MST configuration ID with the same name on all switches with the command:
set spantree mstcfgid Bruins
Please note that it is recommended that you verify that they are identical on each switch by running the command
show spantree mstcfgid
You should see Bruins but watch for slight changes such as 'Bruins' as those differences can be the trickiest to find  because the mind deceives us into thinking we are seeing the same string.

2. Create SIDs 86 and 99
set spantree msti sid 86 create
set spantree msti sid 99 create

3. Create the FID to SID mappings VLAN 10 to SID 86 and VLAN 20 to SID 99
set spantree mstmap 10 sid 86
set spantree mstmap 20 sid 99

4. Configure the root of each SID on different bridges
 
set spantree priority 4096 86
set spantree priority 4096 99

 
Additional notes
The FID corresponds to the  VLAN

All of the configuration digest and FID to SID mappings must match on all switches for full convergence.

 

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