DETAILED STEPS
PurposeCommand or Action
Enables privileged EXEC mode. Enter your password if prompted.enable
Step 1
Example:
Switch> enable
Enters the global configuration mode.configure terminal
Example:
Switch# configure terminal
Step 2
Configures a switch to become the root for the specified VLAN.
spanning-tree vlan vlan-id root primary
[diameter net-diameter
Step 3
•
For vlan-id, you can specify a single VLAN identified by VLAN
ID number, a range of VLANs separated by a hyphen, or a series
of VLANs separated by a comma. The range is 1 to 4094.
Example:
Switch(config)# spanning-tree vlan 20-24
root primary diameter 4
•
(Optional) For diameter net-diameter, specify the maximum
number of switches between any two end stations. The range
is 2 to 7.
Returns to privileged EXEC mode.end
Example:
Switch(config)# end
Step 4
What to Do Next
After configuring the switch as the root switch, we recommend that you avoid manually configuring the hello
time, forward-delay time, and maximum-age time through the spanning-tree vlan vlan-id hello-time,
spanning-tree vlan vlan-id forward-time, and the spanning-tree vlan vlan-id max-age global configuration
commands.
Related Topics
Bridge ID, Device Priority, and Extended System ID, on page 214
Spanning-Tree Topology and BPDUs, on page 213
Accelerated Aging to Retain Connectivity, on page 220
Restrictions for STP, on page 211
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
228
How to Configure Spanning-Tree Features
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