Nortel Networks NN47250-500 Changing spanning tree timers

448 Configuring and managing spanning tree protocol
NN47250-500 (Version 03.01)
Changing spanning tree timers
You can change the following STP timers:
• Hello interval—The interval between configuration messages sent by a WSS 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 WSS 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:
WSS# 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.
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:
WSS# set spantree fwddelay 20 vlan pink
success: change accepted.
Changing the STP maximum age
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.