Re: Disabling spanning tree

There's your answer. Thanks Tony for finding out the other requirements. I
was going against the grain as to the vague question and not knowing all the
requirements. I agree with you on bpdufilter, but the output of
the sh spanning-tree tells a different story. When I get a chance I'm going
to sniff a port with bpdufilter and see the operation. It wouldn't be the
first time the DocCd was wrong about how a command actually works. Case in
point, Pavel did a good job on defunking the max-reserved bandwidth command
with QoS & the DocCD. Hopefully that's not the case with this command.

Cheers

Jonathan Greenwood II
CCIE #22744

On Thu, Apr 16, 2009 at 1:46 PM, Tony Varriale
<tvarriale_at_flamboyaninc.com>wrote:

> Except 2 pages back in the lab book that mentions that this port needs to
> be
> in vlan xy or z.
>
> The question gave a hint in that you cannot use "no spanning-tree". It's
> all right there...all you have to do is see it.
>
> tv
>
> -----Original Message-----
> From: Ryan West [mailto:rwest_at_zyedge.com]
> Sent: Thursday, April 16, 2009 3:16 PM
> To: Jonathan Greenwood II; Tony Varriale
> Cc: ccielab
> Subject: RE: Disabling spanning tree
>
> Johathan and the original person who mentioned "no switchport":
>
> Rack1SW3#show spanning-tree int f0/5
>
> Vlan Role Sts Cost Prio.Nbr Type
> ------------------- ---- --- --------- --------
> --------------------------------
> VLAN0005 Desg FWD 19 128.5 P2p
>
> interface FastEthernet0/5
> switchport access vlan 5
> switchport mode dynamic desirable
> end
> Rack1SW3(config)#in f0/5
> Rack1SW3(config-if)#no swi
> Rack1SW3(config-if)#end
> Rack1SW3#show spa
> *Mar 1 01:53:25.083: %LINK-3-UPDOWN: Interface FastEthernet0/5, changed
> state to up
> Rack1SW3#show span
> Rack1SW3#show spanning-tree int
> *Mar 1 01:53:26.039: %SYS-5-CONFIG_I: Configured from console by console
> *Mar 1 01:53:26.083: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> FastEthernet0/5, changed state to up
> Rack1SW3#show spanning-tree int f0/5
> no spanning tree info available for FastEthernet0/5
>
> winner winner chicken dinner?
>
> -ryan
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Jonathan Greenwood II
> Sent: Thursday, April 16, 2009 3:59 PM
> To: Tony Varriale
> Cc: ccielab
> Subject: Re: Disabling spanning tree
>
> My answer would still be "no switchport" Bottom line BPDUfilter is a STP
> feature. Any command that involves "spanning-tree" on a interface utilizes
> STP, and by default STP runs on every port on a switch . There's no
> command
> that can disable STP on a "per" interface basis. There's nothing in the
> question that says you can't convert the port to layer 3. Now I haven't
> tested this but maybe someone could do a sho spanning-tree on a layer 2
> port
> and try the same on a layer 3 port. If you don't see STP on the layer 3
> port then its safe to say your not running it. I'm pretty sure STP will
> come up on the layer 2 port. Just my thoughts.
>
> HTH
>
> Jonathan Greenwood II
> CCIE #22744
>
> On Thu, Apr 16, 2009 at 12:07 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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> > >> >
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> > >> >
> > >> >
> > >> >
> > >> >
> > >>
> > >>
> > >> --
> > >> Jonathan Greenwood II
> > >> CCIE #22744
> > >>
> > >>
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> >
> > --
> > Jonathan Greenwood II
> > CCIE #22744
> >
> >
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> > --
> > Jonathan Greenwood II
> > CCIE #22744
> >
> >
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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