From: Ibrahim kabir (kebramccie@live.com)
Date: Wed Aug 27 2008 - 19:29:38 ART
The BPDU filtering feature can be globally enabled on the switch or can be
enabled per interface, but
the feature operates with some differences.
At the global level, you can enable BPDU filtering on Port Fast-enabled
interfaces by using the
spanning-tree portfast bpdufilter default global configuration command. This
command prevents
interfaces that are in a Port Fast-operational state from sending or receiving
BPDUs. The interfaces still
send a few BPDUs at link-up before the switch begins to filter outbound BPDUs.
You should globally
enable BPDU filtering on a switch so that hosts connected to these interfaces
do not receive BPDUs. If
a BPDU is received on a Port Fast-enabled interface, the interface loses its
Port Fast-operational status,
and BPDU filtering is disabled.
At the interface level, you can enable BPDU filtering on any interface by
using the spanning-tree
bpdufilter enable interface configuration command without also enabling the
Port Fast feature. This
command prevents the interface from sending or receiving BPDUs.
Caution Enabling BPDU filtering on an interface is the same as disabling
spanning tree on it and can result in
spanning-tree loops.
You can enable the BPDU filtering feature for the entire switch or for an
interface
got that directly for the 3560CG
HTH
kabir
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