Re: Disabling spanning tree

flex is not the right answer as I guess!!

On Thu, Apr 16, 2009 at 10:33 PM, ALL From_NJ <all.from.nj_at_gmail.com> wrote:

> 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/
> > >
> > >> >
> > >> >
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> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >>
> > >>
> > >> --
> > >> Jonathan Greenwood II
> > >> CCIE #22744
> > >>
> > >>
> > >> Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/
> >
> > >>
> > >>
> _______________________________________________________________________
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> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >>
> > >
> >
> >
> > --
> > Jonathan Greenwood II
> > CCIE #22744
> >
> >
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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
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Received on Thu Apr 16 2009 - 22:41:26 ART