Allied Telesis AT-DC2552XS - Manual (Page 365)

AT-DC2552SX Switch Command Line Interface User’s Guide
Section II: Layer 2 Switching 365
SPANNING-TREE HELLO-TIME
Syntax
spanning-tree hello-time hellotime
Parameter
hellotime
Specifies the hello time in seconds. The range is 1 to 10 seconds.
The default is 2 seconds.
Mode
Global Configuration mode
Description
Use this command to change the hello time value on the switch. The hello
time controls how frequently the switches in the spanning-tree domain
send Bridge Protocol Data Units (BPDUs).
The hello time is active only if the switch is in a role of the root bridge in the
spanning tree domain. The other switches in the domain use a dynamic
value supplied by the root bridge.
The forward time, max-age and hello time values should be set according
to the following formulas, as specified in IEEE Standard 802.1d:
max-age <= 2 x (forward time - 1.0 second)
max-age >= 2 x (hello time + 1.0 second)
When MSTP is enabled, this command sets the value to the CIST
(instance 0).
To restore the default 2 seconds, use the NO SPANNING-TREE HELLO-
TIME command.
Confirmation Command
“SHOW SPANNING-TREE” on page 344
Example
This example sets the hello time parameter on the switch to 7 seconds:
awplus> enable
awplus# configure terminal
awplus(config)# spanning-tree hello-time 7