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Configuring Spanning Tree Timers
Exercise care using these commands. For most situations, we recommend that you use the set spantree
Caution
root and set spantree root secondary commands to modify the spanning tree performance parameters.
Table 7-3
Table 7-5
Variable
Hello Time
Maximum Age
Timer
Forward Delay
Timer
Configuring Hello Time
Enter the set spantree hello command to change the Hello time for a VLAN or for a MISTP instance.
The possible range of interval is 1 to 10 seconds.
To configure the spanning tree bridge Hello time for a VLAN or a MISTP instance, perform this task in
privileged mode:
Task
Step 1
Configure the Hello time for a VLAN or
MISTP instance.
Step 2
Verify the configuration.
This example shows how to configure the spanning tree Hello time for VLAN 100 to 7 seconds:
Console> (enable) set spantree hello 7 100
Spantree 100 hello time set to 7 seconds.
Console> (enable)
This example shows how to set the spantree Hello time for an instance to 3 seconds:
Console> (enable) set spantree hello 3 mistp-instance 1
Spantree 1 hello time set to 3 seconds.
Console> (enable)
Configuring Forward Delay Time
Enter the set spantree fwddelay command to configure the spanning tree forward delay time for a
VLAN. The possible range of delay is 4 to 30 seconds.
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
7-32
describes the switch variables that affect spanning tree performance.
Switch Variable Descriptions
Description
Determines how often the switch broadcasts its hello message to
other switches.
Measures the age of the received protocol information recorded for
a port and ensures that this information is discarded when its age
limit exceeds the value of the maximum age parameter recorded by
the switch. The timeout value is the maximum age parameter of the
switches.
Monitors the time spent by a port in the learning and listening
states. The timeout value is the forward delay parameter of the
switches.
Chapter 7
Command
set spantree hello interval [vlan] mistp-instance
[instances]
show spantree [vlan | mistp-instance instances]
Configuring Spanning Tree
Default
20 seconds
2 seconds
15 seconds
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Troubleshooting
