Chapter 18
| Spanning Tree Commands
– 442 –
Command Usage
The MST region name (page 441) and revision number are used to designate a
unique MST region. A bridge (i.e., spanning-tree compliant device such as this
switch) can only belong to one MST region. And all bridges in the same region must
be configured with the same MST instances.
Example
Console(config-mstp)#revision 1
Console(config-mstp)#
Related Commands
name (441)
spanning-tree
bpdu-filter
This command allows you to avoid transmitting BPDUs on configured edge ports
that are connected to end nodes. Use the
no
form to disable this feature.
Syntax
[
no
]
spanning-tree
bpdu-filter
Default Setting
Disabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
â—†
This command stops all Bridge Protocol Data Units (BPDUs) from being
transmitted on configured edge ports to save CPU processing time. This
function is designed to work in conjunction with edge ports which should only
connect end stations to the switch, and therefore do not need to process
BPDUs. However, note that if a trunking port connected to another switch or
bridging device is mistakenly configured as an edge port, and BPDU filtering is
enabled on this port, this might cause a loop in the spanning tree.
â—†
BPDU filter can only be configured on an interface if the edge port attribute is
not disabled (that is, if edge port is set to enabled or auto with the spanning-
tree edge-port command).
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#spanning-tree bpdu-filter
Console(config-if)#
Related Commands
spanning-tree edge-port (445)
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