LevelOne GTL-2691 - Manual (Page 1073)

C HAPTER 37 | Spanning Tree Commands
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C OMMAND U SAGE
◆ 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.
◆ Before enabling BPDU Filter, the interface must first be configured as an
edge port with the spanning-tree edge-port command.
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 ELATED C OMMANDS
spanning-tree edge-port (1075)
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,
or with a keyword to restore the default settings.
S YNTAX
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 EFAULT S ETTING
BPDU Guard: Disabled
Auto-Recovery: Disabled
Auto-Recovery Interval: 300 seconds
C OMMAND M ODE
Interface Configuration (Ethernet, Port Channel)
C OMMAND U SAGE
◆ 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