Catalyst 6509 bridge root.

[mudassir]

Hi,

How to identify root bridge in catalyst 6509 and how to set backbone catalyst 6509 as a root bridge for the network.

[jhalldn]

Hi,

Spanning-tree is implemented as per vlan spanning tree, for example every vlan has its own root bridge.

To identify the primary root, enter "show spanning-tree vlan x" and check the line beginning with "current root..." it will show you the MAC address of the root. Entering "show mac-address table" will show you the MAC and IP addresses.

To set the primary root in the current switch and for every vlan you will bind:

Enter "spanning-tree vlan primary"

Hope this will help you;

[Prashanth Krishnappa]

The following page should help

http://www.cisco.com/warp/public/473/5.html

http://www.cisco.com/warp/public/473/#SpanningTree

[vincent-n]

I agree with the answer provided by jhalldn. Just a note that if you do "show spantree " then by default the switch will only shows spanning tree ONLY for VLAN1. If I were you, find out exactly how many VLANs you have in your network, optionally find out which are the root bridge for each VLAN then ...

1. Designate a root bridge for the entire campus

2. Designate a secondary bridge for the entire campus

3. Setup a time for a major network outage and when the time comes ...

4. Setup primary root bridge to have a value of say 10 for ALL VLANS

5. Similarly setup secondary bridge to have value of say 20 for ALL VLANs

6. Make sure that at steps 4&5, you do NOT move on if you suspected there is an STP problem in your network.

Good luck