C
HAPTER
33
| Spanning Tree Commands
– 796 –
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 (798)
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 to disable this feature.
SYNTAX
[no] spanning-tree bpdu-guard
DEFAULT SETTING
Disabled
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
â—† An edge port should only be connected to end nodes which do not
generate BPDUs. If a BPDU is received on an edge port, this indicates
an invalid network configuration, or that the switch may be under
attack by a hacker. If an interface is shut down by BPDU Guard, it must
be manually re-enabled using the no spanning-tree spanning-disabled
command.
â—† Before enabling BPDU Guard, the interface must be configured as an
edge port with the spanning-tree edge-port command. Also note that if
the edge port attribute is disabled on an interface, BPDU Guard will also
be disabled on that interface.
EXAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#spanning-tree bpdu-guard
Console(config-if)#
RELATED COMMANDS
spanning-tree edge-port (798)
spanning-tree spanning-disabled (805)
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