Switch is not in MST mode

I have 4 switches configured with MST, same region name , same instances and vlans. However when I run  Show Spanning-Tree mst 1 , it dispswlays:
% Switch is not in mst mode


SW1#sh running-config | sect spanning
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree mst configuration
 name OUR-REGION
 instance 1 vlan 55-66
 instance 2 vlan 77-88
===============================
SW2#sh running-config | sect spanning
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree mst configuration
 name OUR-REGION
 instance 1 vlan 55-66
 instance 2 vlan 77-88
===============================
SW3#sh running-config | sect spanning
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree mst configuration
 name OUR-REGION
 instance 1 vlan 55-66
 instance 2 vlan 77-88
================================


SW4#sh running-config | section  spanning-tree
spanning-tree mode pvst
spanning-tree extend system-id
spanning-tree mst configuration
 name OUR-REGION
 instance 1 vlan 55-66
 instance 2 vlan 77-88
==========================
SW4#show sp
SW4#show spanning-tree mst 1
% Switch is not in mst mode
jskfanAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

benhansonCommented:
You are configured with pvst, not mst, so you should just do 'show spanning-tree' to see your status.  If you wanted to switch to mst on all switches, you would do 'spanning-tree mode mst' on each of them, but I wouldn't do so unless you have a specific reason.  I would however switch to rpvst on each of them, running 'spanning-tree mode rapid-pvst' on each switch.  You will need to do this during a maintenance window as switching spanning tree modes will trigger a learn cycle if you don't already have all your ports set with portfast.  Rapid-pvst has quicker convergence than pvst, so certain spanning-tree operations can happen significantly faster with rpvst.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
jskfanAuthor Commented:
You are correct!! That's what I typed on all switches:

spanning-tree mst configuration  
name OUR-REGION
instance 1 vlan 55-66
instance 2 vlan 77-88

I should have enter MST mode first:
spanning-tree mode mst
spanning-tree mst configuration  
name OUR-REGION
instance 1 vlan 55-66
instance 2 vlan 77-88
0
jskfanAuthor Commented:
Thank you !!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Routers

From novice to tech pro — start learning today.