RE: Disabling spanning tree

Rack1SW3(config-if)#do show span int f0/5 det
 Port 5 (FastEthernet0/5) of VLAN0005 is designated forwarding
   Port path cost 19, Port priority 128, Port Identifier 128.5.
   Designated root has priority 32773, address 000d.6565.be00
   Designated bridge has priority 32773, address 000d.6565.be00
   Designated port id is 128.5, designated path cost 0
   Timers: message age 0, forward delay 0, hold 0
   Number of transitions to forwarding state: 1
   The port is in the portfast mode
   Link type is point-to-point by default
   Bpdu filter is enabled
   BPDU: sent 6, received 0
Rack1SW3(config-if)#do show span int f0/5

Vlan Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- --------
--------------------------------
VLAN0005 Desg FWD 19 128.5 P2p Edge
Rack1SW3(config-if)#do sr int f0/5
Building configuration...

Current configuration : 140 bytes
!
interface FastEthernet0/5
 switchport access vlan 5
 switchport mode access
 spanning-tree portfast
 spanning-tree bpdufilter enable
end

You can discard the first 6 that were sent when the port first came online.
It's a ambiguous question, spanning-tree is clearly enabled here, it's just
not passing BPDU's. And the OP mentioned something about not using any "no
spanning-tree" commands, but I'm not sure if he meant "spanning-tree" in
general or with the keyword no in front it.

-ryan

From: Jonathan Greenwood II [mailto:gwood83_at_gmail.com]
Sent: Thursday, April 16, 2009 4:24 PM
To: Ryan West
Cc: Tony Varriale; ccielab
Subject: Re: Disabling spanning tree

Can you add "spanning-tree bpdufilter enable" to that port and see if the port
still shows up in spanning-tree I would be curious? I may have to recant on
the bpdufilter as a viable solution after reading up on it a few more times.
Tony you are correct that BPDU's and the STP operation.
On Thu, Apr 16, 2009 at 1:15 PM, Ryan West
<rwest_at_zyedge.com<mailto:rwest_at_zyedge.com>> wrote:
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>
[mailto: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<mailto: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<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<mailto: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>
[mailto: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<mailto: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<mailto: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<mailto: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/>
<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/>
<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/>
<http://www.ccie.net/>
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net<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/>
>
> _______________________________________________________________________
> 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/>