3Com WX4400 3CRWX440095A manual Changing the STP Hello Interval, Changing the STP Forwarding Delay

Changing Standard Spanning Tree Parameters 357

Changing Spanning Tree Timers

The command applies only to the ports you specify. The port cost on other ports remains unchanged.

You can change the following STP timers:

„Hello interval — The interval between configuration messages sent by a WX switch when the switch is acting as the root bridge. You can specify an interval from 1 through 10 seconds. The default is 2 seconds.

„Forwarding delay — The period of time a bridge other than the root bridge waits after receiving a topology change notification to begin forwarding data packets. You can specify a delay from 4 through 30 seconds. The default is 15 seconds. (The root bridge always forwards traffic.)

„Maximum age — The period of time that a WX switch acting as a designated bridge waits for a new hello packet from the root bridge before determining that the root bridge is no longer available and initiating a topology change. You can specify an age from 6 through 40 seconds. The default is 20 seconds.

Changing the STP Hello Interval

To change the hello interval, use the following command:

set spantree hello interval {all vlan vlan-id}

Specify an interval from 1 through 10 seconds. The default is 2 seconds.

The all option applies the change to all VLANs. Alternatively, specify an individual VLAN.

To change the hello interval for all VLANs to 4 seconds, type the following command:

WX1200# set spantree hello 4 all success: change accepted.

Changing the STP Forwarding Delay

To change the forwarding delay, use the following command:

set spantree fwddelay delay {all vlan vlan-id}

Specify a delay from 4 through 30 seconds. The default is 15 seconds.