VLAN priority confusion

[Damian Cleveland]

Hello All,

Assistance and input appreciated.

I'm using the following command :

spanning-tree vlan 1-31,33-4094 priority 8192. This was originally,

spanning-tree vlan 1-4094 priority 8192

Yet, my vlan priorities read:

Vlan                   Root ID          Cost  Time Age Dly  Root Port
---------------- -------------------- ------ ----- --- ---  ----------------
VLAN0031          4127 0023.04ee.bec8     23    2   20  15  Gi0/1                
VLAN0999          5095 0023.04ee.bec8     23    2   20  15  Gi0/1                
VLAN1001          9193 0015.fab1.a0c0      0    2   20  15         

Whay are 31 and 999 still based on 4096 and not 8192?

Regareds,

[Rolf Fischer · Accepted solution]

Hi,

because the output of this command shows the STP priorities of the root bridge and the local switch is only root bridge for VLAN 1001 (cost 0 and no Port to the root).

Try "show spanning-tree bridge brief" or "show spanning-tree brief" to verify the local STP priorities.

HTH

Rolf

[akhairuddinumair]

Hi,

With little understanding I believe you are taking the output from the non-root switch,
As per my view to resolve this issue.
1) Find out the root bridge in your network
2) type this command "spanning-tree vlan 1-4094 priority 8192" on root bridge --> Mostly core switch of your network.

Hope this helpful to you!