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Chapter 7
Configuring Spanning Tree
To configure the spanning tree forward delay time for a VLAN, perform this task in privileged mode:
Task
Step 1
Configure the forward delay time for a VLAN or
MISTP instance.
Step 2
Verify the configuration.
This example shows how to configure the spanning tree forward delay time for VLAN 100 to
21 seconds:
Console> (enable) set spantree fwddelay 21 100
Spantree 100 forward delay set to 21 seconds.
Console> (enable)
This example shows how to set the bridge forward delay for an instance to 16 seconds:
Console> (enable) set spantree fwddelay 16 mistp-instance 1
Instance 1 forward delay set to 16 seconds.
Console> (enable)
Configuring Maximum Aging Time
Enter the set spantree maxage command to change the spanning tree maximum aging time for a VLAN
or an instance. The possible range of agingtime is 6 to 40 seconds.
To configure the spanning tree maximum aging time for a VLAN or an instance, perform this task in
privileged mode:
Task
Step 1
Configure the maximum aging time for a VLAN
or MISTP instance.
Step 2
Verify the configuration.
This example shows how to configure the spanning tree maximum aging time for VLAN 100 to
36 seconds:
Console> (enable) set spantree maxage 36 100
Spantree 100 max aging time set to 36 seconds.
Console> (enable)
This example shows how to set the maximum aging time for an instance to 25 seconds:
Console> (enable) set spantree maxage 25 mistp-instance 1
Instance 1 max aging time set to 25 seconds.
Console> (enable)
78-12647-02
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
Configuring Spanning Tree Timers
Command
set spantree fwddelay delay [vlan]
mistp-instance [instances]
show spantree [mod/port] mistp-instance
[instances] [active]
Command
set spantree maxage agingtime [vlans]
mistp-instance instances
show spantree [mod/port] mistp-instance
[instances] [active]
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Troubleshooting
