From: Balaji Siva (bsivasub@gmail.com)
Date: Sat Mar 26 2005 - 03:34:40 GMT-3
BPDU filter = stops "sending" bpdu on the port-fast enabled port
BPDU guard = err-disable if the switch "receives" a bpdu on a
port-fast enabled port
BPDU filter enabled port does not send BPDU.. STP disabled port does
not send BPDU. Since Portfast is also enabled, the port goes directly
to forwarding so basically the port acts as if STP is disabled on the
port (but in fact it is running and it would save you from shooting
yourself in the foot if you had actually disabled STP completedly on
that port)
HTH
Balaji
On Sat, 26 Mar 2005 09:54:01 +0800, Dillon Yang <gzdillon@hotmail.com> wrote:
> Hi, group:
>
> I'm confused by the two command "spanning-tree bpdufilter " and "spanning-tree bpduguard enable ".
> <quote> If a BPDU is received on a PortFast-enabled port, the port loses its PortFast-operational status, and BPDU filtering is disabled. </quote>
>
> So I think the former do nothing with filtering and the latter truly filter the BPDU by making the port "error-disable".
>
> <quote> Caution Enabling BPDU filtering on an interface is the same as disabling spanning tree on it and can result in spanning-tree loops. </quote>
>
> I can not understand how "BPDU filtering " is the same as "disabling spanning tree "?
>
> TIA
> dillon
>
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