From: Piotr (usaccie@gmail.com)
Date: Wed Dec 03 2008 - 22:52:13 ARST
Scott posted this link earlier:
http://www.cisco.com/en/US/docs/ios/bridging/command/reference/br_r1.html
Field
Definition
Role
Current 802.1w role; valid values are Boun (boundary), Desg (designated),
Root, Altn (alternate), and Back (backup).
Sts
Spanning-tree states; valid values are BKN*
(broken)1<http://www.cisco.com/en/US/docs/ios/bridging/command/reference/br_r
1.html#wpxref1015174>
,
BLK (blocking), DWN (down), LTN (listening), LBK (loopback), LRN (learning),
and FWD (forwarding).
Cost
Port cost.
Prio.Nbr
Port ID that consists of the port priority and the port number.
Status
Status information; valid values are as follows:
P2p/ShrThe interface is considered as a point-to-point (resp. shared)
interface by the spanning tree.
EdgePortFast has been configured (either globally using the *default
*command
or directly on the interface) and no BPDU has been received.
*ROOT_Inc, *LOOP_Inc, *PVID_Inc and *TYPE_IncThe port is in a broken state
(BKN*) for an inconsistency. The port would be (respectively) Root
inconsistent, Loopguard inconsistent, PVID inconsistent, or Type
inconsistent.
Bound(type)When in MST mode, identifies the boundary ports and specifies
the type of the neighbor (STP, RSTP, or PVST).
Peer(STP)When in PVRST rapid-pvst mode, identifies the port connected to a
previous version of the 802.1D bridge.
1<http://www.cisco.com/en/US/docs/ios/bridging/command/reference/br_r1.html#w
pxref1015175>
For
information on the *, see the definition for the Status field.
On Wed, Dec 3, 2008 at 7:23 PM, Derek Maffei <dmaffei@midwave.com> wrote:
> I completely agree that BKN may stand for BroKeN (root-inconsistent) ,
> however I thought, and I may be incorrect, that a port in BKN state is
> in blocking state. I too had an experience with this in real world
> situation and debugging indicated that the port went to blocking state
> as part of the BKN (inconsistency).
>
> Aren't there still only 5 states (Blocking, Listening, Learning,
> Forwarding and Disabled) of spanning tree?.
>
>
>
> -----Original Message-----
> From: Ronnie Angello [mailto:ronnie.angello@gmail.com]
> Sent: Wednesday, December 03, 2008 2:35 PM
> To: Derek Maffei
> Cc: haider aly; L Pham; Amr; ccielab
> Subject: Re: Spanning Tree on Doc CD
>
> FYI if you want to lab this up - I just ran into this in the real
> world. All you need is a simple 3 switch lab with the switches
> connected in series. Switch C probably isn't really needed but is
> what I was dealing with in this case.
>
> A---B---C
>
> Switch A is Cisco and runs MST. Switch B is Cisco and runs rapid
> PVST+, and is configured to be the root for all VLANs. Switch C is HP
> ProCurve and runs RSTP.
>
> Observe the behavior on the MST boundary switch - switch A. There is
> a really good explanation of the problem here.
>
> http://blog.internetworkexpert.com/2008/09/24/mstp-tutorial-part-ii-outs
>
ide-a-region/<http://blog.internetworkexpert.com/2008/09/24/mstp-tutorial-par
t-ii-outside-a-region/>
>
> The section of particular interest is "Interoperating with PVST."
>
> On Wed, Dec 3, 2008 at 3:23 PM, Ronnie Angello
> <ronnie.angello@gmail.com> wrote:
> > I meant BroKeN but you get the point...
> >
> > On Wed, Dec 3, 2008 at 3:22 PM, Ronnie Angello
> <ronnie.angello@gmail.com> wrote:
> >> Actually that means BRoKen - root inconsistent. Blocking would be
> >> BLK. Remember what a designated port is - why would it be blocking?
> >>
> >> On Wed, Dec 3, 2008 at 2:24 PM, Derek Maffei <dmaffei@midwave.com>
> wrote:
> >>> BKN actually means blocking
> >>>
> >>> VLAN0123
> >>> Spanning tree enabled protocol rstp
> >>> Root ID Priority 32891
> >>> Address 0050.3e05.9c00
> >>> This bridge is the root
> >>> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
> >>> Bridge ID Priority 32891 (priority 32768 sys-id-ext 123)
> >>> Address 0050.3e05.9c00
> >>> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
> >>> Aging Time 300
> >>> Interface Role Sts Cost Prio.Nbr Type
> >>> ---------------- ---- --- --------- --------
> >>> --------------------------------
> >>> Fa8/1 Desg BKN*19 240.897 P2p *ROOT_Inc
> >>> Fa8/45 Desg FWD 19 128.941 P2p
> >>> Gi9/14 Desg FWD 4 128.1038 P2p
> >>> Gi9/15 Desg FWD 4 128.1039 Edge P2p
> >>>
> >>> ! "Desg" means designated port role; BKN means status blocking;
> >>> ! FWD means forwarding. Notice the "ROOT Inc" status for port Fa8/1.
> >>>
> >>> -----Original Message-----
> >>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of
> >>> Ronnie Angello
> >>> Sent: Wednesday, December 03, 2008 1:17 PM
> >>> To: haider aly
> >>> Cc: L Pham; Amr; ccielab
> >>> Subject: Re: Spanning Tree on Doc CD
> >>>
> >>> Broken! The port is in a broken state for an inconsistency - root
> >>> inconsistent, loopguard inconsistent, etc.
> >>>
> >>> On Wed, Dec 3, 2008 at 11:06 AM, haider aly <ccie.aly.110@gmail.com>
> >>> wrote:
> >>>> Hi Friends,
> >>>> i just want to know.....what is this BKN state in STP...?
> >>>>
> >>>>
> >>>> thanks & regards
> >>>>
> >>>> Haider Ali
> >>>>
> >>>>
> >>>> On 12/3/08, L Pham <ccie17030@gmail.com> wrote:
> >>>>>
> >>>>> Amr, most ccie-wanabe should (at least ) know how to get here ...
> >>>>>
> >>>>> but, here it is:
> >>>>> The Cisco Documentation pages have the same information that
> >>>>> currently resides on UniversCD, please refer to the links on the
> CCIE
> >>>>> web pages to view these pages and become familiar with the new
> >>> format.
> >>>>>
> >>>>> Cisco Documentation:
> http://www.cisco.com/web/psa/products/index.html
> >>>>>
> >>>>> ->goto SWitching->your favorite-ios->pick a release -> look for
> your
> >>>>> answers!!!
> >>>>>
> >>>>> HTH,
> >>>>> Loc
> >>>>>
> >>>>> On Wed, Dec 3, 2008 at 7:15 AM, Amr <amr.ccie@gmail.com> wrote:
> >>>>> > Dear All
> >>>>> > Where to find Spanning tree (PVST , MST , RSTP) on
> the
> >>> DOC CD
> >>>>> ?
> >>>>> >
> >>>>> > Thanks In Advance
> >>>>> >
> >>>>> > Regards
> >>>>> >
> >>>>> >
> >>>>> > Blogs and organic groups at 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
> >>>>>
> >>>>>
> >>>
> _______________________________________________________________________
> >>>>> Subscription information may be found at:
> >>>>> http://www.groupstudy.com/list/CCIELab.html
> >>>>
> >>>>
> >>>> Blogs and organic groups at http://www.ccie.net
> >>>>
> >>>>
> >>>
> _______________________________________________________________________
> >>>> Subscription information may be found at:
> >>>> http://www.groupstudy.com/list/CCIELab.html
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> Ronald Angello
> >>> CCIE #17846
> >>>
> >>>
> >>> Blogs and organic groups at http://www.ccie.net
> >>>
> >>>
> _______________________________________________________________________
> >>> Subscription information may be found at:
> >>> http://www.groupstudy.com/list/CCIELab.html
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >> --
> >> Ronald Angello
> >> CCIE #17846
> >>
> >
> >
> >
> > --
> > Ronald Angello
> > CCIE #17846
> >
>
>
>
> --
> Ronald Angello
> CCIE #17846
>
>
> Blogs and organic groups at 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
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