asked on

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 disp

lays:
% 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

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benhanson

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jskfan

ASKER

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

jskfan

ASKER

Thank you !!