No Spanning-Tree Vlan # on C2950

[DavidEJoy]

Hello everyone,

I've recently found that one of the switches on my network (which I never set up) is running a "no spanning-tree vlan 3, 5, 10" command, which I want to remove, but I have been unable to. When I do try and type in "spanning-tree vlan 3" nothing comes up, but when I show spanning tree it lets me know that it doesn't exist.

Is there a command I'm missing? (It's a larger number of vlans)

Thanks in advance,
David

[WILLIAM STEGMAN]

Does vlan 3 exist on the switch and are any ports assigned to vlan 3?

[DavidEJoy]

It does exist in the vlan table, it's coming from VTP. No ports are designated specifically with VLAN3

[WILLIAM STEGMAN]

I'm not sure there would be anything for spanning tree to calculate if no ports on the switch are assigned to vlan 3.  Try assigning an unused port to vlan 3 and see if your output of sh spanning-tree vlan 3 changes.