Spanning-Tree Bpdu-Guard - Motorola EX-3524 Cli Reference Manual

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.
◆
Before enabling BPDU Filter, the interface must first be configured as an edge
port with the
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 (381)
spanning-tree
This command shuts down an edge port (i.e., an interface set for fast forwarding) if
bpdu-guard 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
◆
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
◆
Before enabling BPDU Guard, the interface must be configured as an edge port
with the
attribute is disabled on an interface, BPDU Guard will also be disabled on that
interface.
spanning-tree edge-port
no spanning-tree spanning-disabled
spanning-tree edge-port
– 379 –
Chapter 16
| Spanning Tree Commands
command.
command.
command. Also note that if the edge port