MSTP configuration imbalance

[gregorydhenderson1]

I am configuring MSTP for the first time on three switches in my network (lab environment) my running config for the three switches is :

spanning-tree mode mst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
spanning-tree vlan 1 priority 24576
spanning-tree vlan 1 forward-time 12
spanning-tree vlan 1 max-age 16
spanning-tree mst configuration
 name Greg_MSTP_Lab_Config
 revision 1
 instance 1 vlan 1
spanning-tree mst 1 priority 24576
==========================================LabSwitch1

spanning-tree mode rapid-pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
----------------------------------------Server Room Sw
spanning-tree mode mst
spanning-tree portfast bpduguard default
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
no spanning-tree vlan 1
spanning-tree vlan 1 priority 61440

=====================================LabSwitch2

My Problem: 1) I cannot ping the default gateway with LabSwitch 2

                     2) I cannot telnet from LSW2 to any other devices

I know I have a problem with my MST config, and I think the biggest one is the "no spanning-tree vlan 1" statement in LSW2. I have tried to reconfigure several times with no success. I am trying to put all three switches in the same region, enable them and pass traffic.

Thank you for any help you can provide.

[Reza Sharifi · Accepted solution]

How are these switches physically connected together?

If you are planning to make labswitch1 the root, than your config seems to be correct on that switch.

You also need to configure Server Room Sw and LabSwitch2 with the same mst config as

LabSwitch1 but no need for "spanning-tree mst 1 priority 24576"

This way, both Room Sw and LabSwitch2 will have the default stp config of 32768 and should point to labswitch1 as the root.

HTH

[gregorydhenderson1]

I will try this. That is, in fact, my intention. I am reconfiguring both switches now. Thank you.