Allied Telesis AT-9000 Series - Manual (Page 153)

AlliedWare Plus Version 2.1.8 Management Software Web Interface User’s Guide
153
Note
Set the hello time, forward delay, and max-age fields 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)
 Hello Time— Specifies the frequency that the switch sends
spanning tree configuration information when it is the root bridge or
is trying to become the root bridge.
 Forward Delay— Sets the forward time parameter on the switch
and specifies how long the ports remain in the listening and
learning states before they transition to the forwarding state.
This Forward Delay value is active only when the switch is acting
as the root bridge of the spanning tree domain. Switches that are
not acting as the root bridge use a dynamic value supplied by the
root bridge.
 Max Age— Determines how long bridge protocol data units
(BPDUs) are stored by the switch before they are deleted.
 BPDU Guard— Enables or disables the BPDU loop-guard feature
on the switch. If a port that has this feature activated stops
receiving BPDU packets, the switch automatically disables it. A
port that has been disabled by the feature remains in that state
until it begins to receive BPDU packets again or the switch is reset.
The default setting for BPDU loop-guard on the ports is disabled.
4. Click Apply.
5. Click SAVE.