From: Hotmail (pauwen@hotmail.com)
Date: Sat Mar 26 2005 - 06:05:45 GMT-3
Hello Dillon,
not sure what the exact wording of the requirement is, but maybe by
!dblocking!d they mean that the port is disabled, which would hold true for
BPDU Guard...
Regards,
Georg
----- Original Message -----
From: "Dillon Yang" <gzdillon@hotmail.com>
To: "Balaji Siva" <bsivasub@gmail.com>
Cc: "Group Study" <ccielab@groupstudy.com>
Sent: Saturday, March 26, 2005 8:56 AM
Subject: Re: bpdufilter vs bpduguard
> Hi, Balaji:
>
> It sounds right. But if I am asked for a task that a port need to go to
forwarding fastly and should change its state to block when it receive bpdu
packets, what can I do?
> bpduguard is not the answer for the port goes to err-disable, bpdufilter
is not too, for the port lose its portfast attribute to normal STP process.
>
>
> TIA
> dillon
>
> ----- Original Message -----
> From: "Balaji Siva" <bsivasub@gmail.com>
> To: "Dillon Yang" <gzdillon@hotmail.com>
> Cc: "Group Study" <ccielab@groupstudy.com>
> Sent: Saturday, March 26, 2005 2:34 PM
> Subject: Re: bpdufilter vs bpduguard
>
>
> > 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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