Switching and Routing

Re: Please advise if my settings for MSTP are correct

 
vmuhanov
Occasional Collector

Please advise if my settings for MSTP are correct

I am trying to build a network using MSTP on HPE OfficeConnect 1920, as follows:

https://yadi.sk/i/dOlxH_swp47PmQ 

 

RI1
spanning-tree mst priority 0 8192
spanning-tree mst instance 1
spanning-tree mst priority 1 8192
spanning-tree mst instance 2
spanning-tree mst priority 2 16384
EI1
spanning-tree mst priority 0 16384
spanning-tree mst instance 1
spanning-tree mst priority 1 4096
spanning-tree mst instance 2
spanning-tree mst priority 2 8192
WI1
spanning-tree mst priority 0 16384
spanning-tree mst instance 1
spanning-tree mst priority 1 8192
spanning-tree mst instance 2
spanning-tree mst priority 2 16384
 
RI2
spanning-tree mst priority 0 16384
spanning-tree mst instance 1
spanning-tree mst priority 1 16384
spanning-tree mst instance 2
spanning-tree mst priority 2 8192
EI2
spanning-tree mst priority 0 32768
spanning-tree mst instance 1
spanning-tree mst priority 1 8192
spanning-tree mst instance 2
spanning-tree mst priority 2 4096
WI2
spanning-tree mst priority 0 16384
spanning-tree mst instance 1
spanning-tree mst priority 1 16384
spanning-tree mst instance 2
spanning-tree mst priority 2 8192
 
RI3
spanning-tree mst priority 0 8192
spanning-tree mst instance 1
spanning-tree mst priority 1 16384
spanning-tree mst instance 2
spanning-tree mst priority 2 16384
EI3
spanning-tree mst priority 0 8192
spanning-tree mst instance 1
spanning-tree mst priority 1 16384
spanning-tree mst instance 2
spanning-tree mst priority 2 16384
WI3
spanning-tree mst priority 0 4096
spanning-tree mst instance 1
spanning-tree mst priority 1 16384
spanning-tree mst instance 2
spanning-tree mst priority 2 32768
2 REPLIES 2
Ivan_B
HPE Pro

Re: Please advise if my settings for MSTP are correct

Hi @vmuhanov !

In my opinion "correctness" of a configuraiton should be measured against the target. There is only one thing that really matters - what is your idea about this network, how do you want it to work. It's you who decides what is needed. If a configuration does what you want, it is correct. It may be not optimal, not scalable, but it will be correct if correctness is all you care about.

Will this configuration work? Yes, MSTP will take care and provide you the loop-free network. Is this design optimal - the whole idea of building relatively large (outside small office) network using L2 access swithes seems very questionable to me, but you are the one who takes the decision, if you want to go this way, good luck. In overall your picture reminds me one famous article by Petr Lapukhov - https://blog.ine.com/2008/09/24/mstp-tutorial-part-ii-outside-a-region Is it the source of your network design inspiration? (-: If those clouds are regions like in Petr's article I hope you understand that from 6 inter-region links you will have only 2 links forwarding. But in overall it should work and MSTP is definitely the least problem of this network (-: 

 

I am an HPE employee

Accept or Kudo

vmuhanov
Occasional Collector

Re: Please advise if my settings for MSTP are correct

Right, I used the article by Petr Lapukhov as a basis.
But the priority assignment is that what remains unclear for me.
 
To assign priorities I used the following:
Let RI1 be the root for instance 0
      WI2 be the root for instance 1
       EI3 be the root for instance 2 
Then the priorities can be assigned according to diagrams as follows: