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Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 18 Configuring STP and MST
Configuring STP
This example shows how to verify the configuration:
Switch# show spanning-tree vlan 200 bridge brief
Hello Max Fwd
Vlan Bridge ID Time Age Delay Protocol
---------------- -------------------- ---- ---- ----- --------
VLAN200 49152 0050.3e8d.64c8 2 36 15 ieee
Switch#
Configuring the Forward-Delay Time for a VLAN
Note Exercise care when configuring forward-delay time. In most cases, we recommend that you use the
spanning-tree vlan vlan_ID root primary and the spanning-tree vlan vlan_ID root secondary
commands to modify the forward delay time.
To configure the spanning tree forward delay time for a VLAN, perform this task:
This example shows how to configure the forward delay time for VLAN 200 to 21 seconds:
Switch# configure terminal
Switch(config)# spanning-tree vlan 200 forward-time 21
Switch(config)# end
Switch#
This example shows how to verify the configuration:
Switch# show spanning-tree vlan 200 bridge brief
Hello Max Fwd
Vlan Bridge ID Time Age Delay Protocol
---------------- -------------------- ---- ---- ----- --------
VLAN200 49152 0050.3e8d.64c8 2 20 21 ieee
Switch#
This example shows how to display spanning tree information for the bridge:
Switch# show spanning-tree bridge
Hello Max Fwd
Vlan Bridge ID Time Age Dly Protocol
---------------- --------------------------------- ----- --- --- --------
VLAN200 49152 0050.3e8d.64c8 2 20 15 ieee
VLAN202 49152 0050.3e8d.64c9 2 20 15 ieee
VLAN203 49152 0050.3e8d.64ca 2 20 15 ieee
VLAN204 49152 0050.3e8d.64cb 2 20 15 ieee
VLAN205 49152 0050.3e8d.64cc 2 20 15 ieee
VLAN206 49152 0050.3e8d.64cd 2 20 15 ieee
Switch#
Command Purpose
Step 1
Switch(config)# [no] spanning-tree vlan vlan_ID
forward-time forward_time
Configures the forward time of a VLAN. The
forward_time value can be from 4 to 30 seconds.
Use the no keyword to restore the defaults.
Step 2
Switch(config)# end
Exits configuration mode.
Step 3
Switch# show spanning-tree vlan vlan_ID bridge
[brief]
Verifies the configuration.