Allied Telesis AT-S100 - Manual (Page 66)

Chapter 2: Configuring the AT-S100 Software
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occur, the current bridge must be the root bridge. A very low value of this
command leads to excessive traffic on the network, while a higher value
delays the detection of topology change. This value is used by all
instances.
The syntax of this command is:
spanning-tree hello-time (1-10)
The following commands set the hello delay time to 5 seconds:
switch#configure terminal
switch(config)#spanning-tree hello-time 5
For more information about this command, see “SPANNING-TREE
HELLO-TIME” on page 250.
Setting the BPDU Filter
The Spanning Tree Protocol sends BPDUs from all interfaces. Enabling
the BPDU filter ensures that portfast-enabled interfaces do not transmit or
receive any BPDUs. Use the SPANNING-TREE BPDU-FILTER DEFAULT
command to globally enable the BPDU filter on a bridge.
The syntax of this command is:
spanning-tree portfast bpdu-filter default
The following commands enable the BPDU filter on a bridge:
switch#configure terminal
switch(config)#spanning-tree portfast bpdu-filter
default
For more information about this command, see “SPANNING-TREE
PORTFAST BPDU-FILTER DEFAULT” on page 253.
Setting the BPDU Guard
When the BPDU guard feature is set for a bridge, all portfast-enabled
interfaces of the bridge that have the BPDU guard set to default shut down
the interface on receiving a BPDU. In this case, the BPDU is not
processed. You can bring the interface up manually by using the NO
SHUTDOWN command. See “SHUTDOWN” on page 181.
Use the SPANNING-TREE BPDU-GUARD DEFAULT command to enable
the BPDU (Bridge Protocol Data Unit) guard feature on a bridge. This
command indicates the bridge level BPDU-Guard configuration takes
effect.