Motorola WS5100 Series, Cli Reference Manual

Page: 223 / 492

Global Configuration Commands 5-59
Usage Guidelines
The
mst > configuration
command moves you to the spanning tree-mst Instance on
page 13-1 Instance instance.
If a bridge does not hear bridge protocol data units (BPDUs) from the root bridge within the
specified interval, defined in the max-age (seconds) parameter, assume the network has
changed and recomputed the spanning-tree topology.
Generally, spanning tree configuration settings in config mode performs the configuration
for bridge and bridge instances (for the switch).
Example
WS5100(config)#spanning-tree portfast bpduguard default
WS5100(config)#
WS5100(config)#spanning-tree mst configuration
WS5100(config-mst)#
portfast
[bpdufilter|bpduguard]
(default) Enables the portfast feature on a bridge. It has the
following options:
• bpdufilter (default) – Use the
bpdu-filter
command to
set the portfast BPDU filter for the port. Use the
no
parameter with this command to revert the port BPDU
filter value to default
The Spanning Tree Protocol sends BPDUs from all ports.
Enabling the BPDU Filter feature ensures
PortFastenabled ports do not transmit or receive BPDUs.
• bpduguard (default) – Use the
bpdu-guard
command to
enable the BPDU (Bridge Protocol Data Unit) Guard
feature on a bridge.
Use the
no
parameter with this command to disable
BPDU Guard. When the BPDU Guard is set for a bridge,
all portfast-enabled ports of the bridge that have BPDU
guard set to default shut down the port on receiving a
BPDU. In this case, the BPDU is not processed. The port
can be brought back up manually (using the no shutdown
command), or by configuring a errdisable-timeout to
enable the port after the specified interval.