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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
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Chapter 6 Configuring the System
Configuring STP
Changing the BPDU Message Interval
Beginning in privileged EXEC mode, follow these steps to change the BPDU message interval (max age
time). The stp-list is the list of VLANs to which the STP command applies.
Changing the Hello BPDU Interval
Beginning in privileged EXEC mode, follow these steps to change the hello BPDU interval (hello time).
The stp-list is the list of VLANs to which the STP command applies.
Changing the Forwarding Delay Time
Beginning in privileged EXEC mode, follow these steps to change the forwarding delay time. The
stp-list is the list of VLANs to which the STP command applies.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
spanning-tree [vlan stp-list]
max-age seconds
Specify the interval between messages the spanning tree receives from the
root switch.
The maximum age is the number of seconds a switch waits without receiving
STP configuration messages before attempting a reconfiguration. Enter a
number from 6 to 200.
Step 3
end
Return to privileged EXEC mode.
Step 4
show spanning-tree
Verify your entry.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
spanning-tree [vlan stp-list]
hello-time seconds
Specify the interval between hello BPDUs.
Hello messages show that the switch is active. Enter a number from 1 to 10.
Step 3
end
Return to privileged EXEC mode.
Step 4
show spanning-tree
Verify your entry.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
spanning-tree [vlan stp-list]
forward-time seconds
Specify the forwarding time for the specified spanning-tree instance.
The forward delay is the number of seconds a port waits before changing
from its STP learning and listening states to the forwarding state. Enter a
number from 4 to 200.
The default for IEEE is 15 seconds; the default for IBM is 4 seconds.
Step 3
end
Return to privileged EXEC mode.
Step 4
show spanning-tree
Verify your entry.
