LevelOne FGL-2870 - Manual (Page 649)

Spanning Tree Commands
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• Since end-nodes cannot cause forwarding loops, they can be passed through
the spanning tree state changes more quickly than allowed by standard
convergence time. Fast forwarding can achieve quicker convergence for
end-node workstations and servers, and also overcome other STA related
timeout problems. (Remember that fast forwarding should only be enabled for
ports connected to a LAN segment that is at the end of a bridged LAN or for
an end-node device.)
• This command is the same as spanning-tree edge-port, and is only included
for backward compatibility with earlier products. Note that this command may
be removed for future software versions.
Example
Related Commands
spanning-tree edge-port (4-281)
spanning-tree bpdu-filter
This command filters all BPDUs received on an edge port. Use the no form to
disable this feature.
Syntax
[no] spanning-tree bpdu-filter
Default Setting
Disabled
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• 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 or spanning-tree portfast command.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#bridge-group 1 portfast
Console(config-if)#
Console(config)#interface ethernet ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#spanning-tree bpdu-filter
Console(config-if)#