Network Router User Manual

Chapter 3: Bridging Configuration Guide
30 SmartSwitch Router User Reference Manual
Adjusting Bridge Protocol Data Unit (BPDU) Intervals
You can adjust BPDU intervals as described in the following sections:
• Adjust the Interval between Hello BPDUs
• Define the Forward Delay Interval
• Define the Maximum Idle Interval
Adjusting the Interval between Hello Times
You can specify the interval between hello time.
To adjust this interval, enter the following command in Configure mode:
Defining the Forward Delay Interval
The forward delay interval is the amount of time spent listening for topology change
information after an interface has been activated for bridging and before forwarding
actually begins.
To change the default interval setting, enter the following command in Configure mode:
Defining the Maximum Age
If a bridge does not hear BPDUs from the root bridge within a specified interval, it
assumes that the network has changed and recomputes the spanning-tree topology.
Specify the interval between hello
time for default spanning tree.
stp set bridging hello-time <num>
Specify the interval between hello
time for a particular instance of
spanning tree.
pvst set bridging spanning-tree <string>
hello-time <num>
Set the default of the forward delay
interval for default spanning tree.
stp set bridging forward-delay <num>
Set the default of the forward delay
interval for a particular instance of
spanning tree.
pvst set bridging spanning-tree <string>
forward-delay <num>