Conf Spanning-Tree on 3550

jmaurer1205 · ‎12-10-2007

I'm trying to understand Spanning-Tree configuration a little better so that I can configure my 3550 and 2960.

The root ST has the lowest Priority. MAC/Priority. I understand the STP process, but I'm not understanding how to configure my 3550 as the root switch.

I see the command " spanning-tree vlan VID root primary" Does this mean that I need to set the VLAN on that switch as the root primary instead of configuring the Switch as the root?

Config I'm setting up.

VLAN on 3550

1

10

20

30

40

VLAN on 2960

50

60

70

I have the trunk configured.

nordick26 · ‎12-10-2007

Hi,

if you are to elect your STP root by your self, you can configure your rood STP using following command:

spanning-tree vlan < vlan> priority <0-61440>

This will change the priority for specific VLAN so that this switch can became the STP root.

Yes, with spanning-tree vlan VID root primary you can achieve the same and you can also use "root sedondary" for your backup STP switch

The primary priority will be 24576 and secondary will be assigned 28672.

Hope this helps

Regards

[rate any helpful posts]

glen.grant · ‎12-10-2007

Correct each vlan has its own instance of spanning tree so you should set each vlan's spanning tree where you want it .

jmaurer1205 · ‎12-10-2007

Kewl Thank you