Black Box LGB6026A, Management Manual

Page: 874 / 1289

C
HAPTER
37 | Spanning Tree Commands
– 872 –
spanning-tree bpdu-
filter
This command filters all BPDUs received on an edge port. Use the no form
to disable this feature.
S
YNTAX
[ no ] spanning-tree bpdu-filter
D
EFAULT
S
ETTING
Disabled
C
OMMAND
M
ODE
Interface Configuration (Ethernet, Port Channel)
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 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 (874)
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.
S
YNTAX
[ no ] spanning-tree bpdu-guard
D
EFAULT
S
ETTING
Disabled
C
OMMAND
M
ODE
Interface Configuration (Ethernet, Port Channel)