Global Configuration Commands
5-121
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 the config mode define the configuration
for bridge and bridge instances.
Example
RFSwitch(config)#spanning-tree portfast bpduguard default
RFSwitch(config)#
RFSwitch(config)#spanning-tree mst configuration
RFSwitch(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
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