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Chapter 34: Spanning Tree Commands
spanning-tree
bpdu-guard
D
S
EFAULT
ETTING
Disabled
C
M
OMMAND
ODE
Interface Configuration (Ethernet, Port Channel)
C
U
OMMAND
SAGE
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.
Before enabling BPDU Filter, the interface must first be configured as an
•
edge port with the
spanning-tree edge-port
E
XAMPLE
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#spanning-tree bpdu-filter
Console(config-if)#
R
C
ELATED
OMMANDS
spanning-tree edge-port (1035)
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)
D
S
EFAULT
ETTING
BPDU Guard: Disabled
Auto-Recovery: Disabled
Auto-Recovery Interval: 300 seconds
C
M
OMMAND
ODE
Interface Configuration (Ethernet, Port Channel)
– 1033 –
command.
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