Re: Disabling spanning tree

Hey team,

Here is another way to consider ... Flex Links. Not sure how this lines up
with the question and or the lab you are doing, but it does achieve the
desired results; Spanning Tree disabled. (watch the ugly word wrap)

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_50_se/configuration/guide/swflink.html

Copied and pasted from this link: "... STP is disabled on Flex Link
interfaces ..."

Pretty good input from everyone! As usual I am learning much from you
all. HTH,

Andrew Lee Lissitz

On Thu, Apr 16, 2009 at 3:07 PM, Tony Varriale
<tvarriale_at_flamboyaninc.com>wrote:

> STP cannot be operational without BPDUs.
>
>
>
> BPDU filter effectively disables spanning tree on a port because it filters
> in AND out. Is it a turn off knob? No. Is it a trick? Yes.
>
>
>
> tv
>
>
>
> From: Jonathan Greenwood II [mailto:gwood83_at_gmail.com]
> Sent: Thursday, April 16, 2009 1:48 PM
> To: Tony Varriale
> Cc: ccielab
> Subject: Re: Disabling spanning tree
>
>
>
> STP is still operational as the port still must transtion through the
> various port states, in this case you have portfast which is a STP feature.
> That's still STP wouldn't you agree regardless of BPDU's being filtered or
> not? I don't have access to a switch at the moment, but I agree with your
> test. My argument is that you can't disable STP on a per port basis.
>
> Jonathan Greenwood II
>
> CCIE #22744
>
>
>
>
> On Thu, Apr 16, 2009 at 11:40 AM, Tony Varriale <
> tvarriale_at_flamboyaninc.com>
> wrote:
>
> The question mentions nothing about TCNs or port flapping.
>
> How about config BPDUs? Put it up in a lab...
>
> Here's a quick example in production for you that has portfast but not
> bpdufilter:
>
> interface GigabitEthernet9/12
> switchport
> switchport access vlan 12
> switchport mode access
> spanning-tree portfast
>
> xyz#sh spanning-tree int g9/12 d
> BPDU: sent 10566749, received 0
>
> Spanning tree is not disabled. Period.
>
> Here's one in production with bpdufilter:
>
> xyz#sh run int g1/1
> Building configuration...
>
> Current configuration : 171 bytes
> !
> interface GigabitEthernet1/1
> switchport access vlan 201
> switchport mode access
> spanning-tree portfast
> spanning-tree bpdufilter enable
>
> xyz#sh spanning-tree int g1/1 d
> BPDU: sent 0, received 0
>
> No BPDUs sent or received. If both are none, would you say it's
> participating in spanning tree?
>
> tv
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>
> Jonathan Greenwood II
> Sent: Thursday, April 16, 2009 1:25 PM
> To: Tharak Abraham
> Cc: Salah ElShekeil; ccielab
> Subject: Re: Disabling spanning tree
>
> With portfast TCN BPDU's will not be sent if a port goes up or down thats
> configured for portfast. FYI
>
> Jonathan Greenwood II
> CCIE #22744
>
> On Thu, Apr 16, 2009 at 11:17 AM, Tharak Abraham
> <tharakabraham_at_gmail.com>wrote:
>
> > Spanning tree would be still be active even if you enable portfast and
> > bpdus will be sent out !
> >
> > bpdu filter on access ports will stop all kinds of bpdu's and hence that
> > should be more appropriate in this context !
> >
> >
> > Tharak Abraham Luke
> >
> >
> > On Thu, Apr 16, 2009 at 8:04 PM, Jonathan Greenwood II <
> > gwood83_at_gmail.com> wrote:
> >
> >> I agree with Mr. West. They are looking for portfast based on your
> >> question.
> >>
> >> HTH
> >>
> >> Jonathan Greenwood II
> >> CCIE #22744
> >>
> >> On Thu, Apr 16, 2009 at 10:17 AM, Salah ElShekeil <
> >> salah.elshekeil_at_gmail.com
> >> > wrote:
> >>
> >> > Dear all,
> >> >
> >> >
> >> >
> >> > how to disable spanning tree on an interface without using "no
> spanning
> >> > tree" command?
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > Salah
> >> >
> >> >
> >> > Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/
> >
> >> >
> >> >
> _______________________________________________________________________
> >> > Subscription information may be found at:
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> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >> --
> >> Jonathan Greenwood II
> >> CCIE #22744
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/>
> >>
> >> _______________________________________________________________________
> >> Subscription information may be found at:
> >> http://www.groupstudy.com/list/CCIELab.html
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
>
>
> --
> Jonathan Greenwood II
> CCIE #22744
>
>
> Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/>
>
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>
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>
>
>
>
>
>
>
> --
> Jonathan Greenwood II
> CCIE #22744
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net