RE: Disabling spanning tree

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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> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >> --
> >> 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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-- 
Jonathan Greenwood II
CCIE #22744
Blogs and organic groups at http://www.ccie.net