Chapter 19
| Spanning Tree Commands
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spanning-tree
bpdu-filter
This command filters all BPDUs received on an edge port. 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 filters all Bridge Protocol Data Units (BPDUs) received on an
interface 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—† Before enabling BPDU Filter, the interface must first be configured as an edge
port 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 (529)
spanning-tree
bpdu-guard
This command shuts down an edge port (i.e., an interface set for fast forwarding) if
it receives a BPDU. Use the no form without any keywords to disable this feature, or
with a keyword to restore the default settings.
Syntax
spanning-tree bpdu-guard [auto-recovery [interval interval]]
no spanning-tree bpdu-guard [auto-recovery [interval]]
auto-recovery - Automatically re-enables an interface after the specified
interval.
interval - The time to wait before re-enabling an interface. (Range: 30-86400
seconds)
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