3com WX1200 3CRWX120695A User Manual

C

HAPTER

 17: C

ONFIGURING

 

AND

 M

ANAGING

 S

PANNING

 T

REE

 P

ROTOCOL

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

To change the forwarding delay on VLAN pink to 20 seconds, type the 
following command:

WX1200# set spantree fwddelay 20 vlan pink
success: change accepted.

To change the maximum age, use the following command:

set spantree maxage aging-time {all | vlan vlan-id}

Specify an age from 6 through 40 seconds. The default is 20 seconds.

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

To change the maximum acceptable age for root bridge hello packets on 
all VLANs to 15 seconds, type the following command:

WX1200# set spantree maxage 15 all
success: change accepted.

The standard STP timers delay traffic forwarding briefly after a topology 
change. The time a port takes to change from the listening state to the 
learning state or from the learning state to the forwarding state is called 
the forwarding delay. In some configurations, this delay is unnecessary. 
The WX switch provides the following fast convergence features to 
bypass the forwarding delay: 

„

Port fast

„

Backbone fast

„

Uplink fast

Port fast convergence bypasses both the listening and learning stages and 
immediately places a port in the forwarding state. You can use port fast 
convergence on ports that are directly connected to servers, hosts, or 
other MAC stations.