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Changing Standard Spanning Tree Parameters 357
The command applies only to the ports you specify. The port cost on
other ports remains unchanged.
Changing Spanning
Tree Timers
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.