RE: STP ROOT BRIDGE PROBLEM!!!!

Hi Abiola,

Not sure what you are seeing. It seems I can configure root guard on a
nonroot bridge. Below you see it configured on a root port:

SW4#sh span vlan 20

VLAN0020
  Spanning tree enabled protocol ieee
  Root ID Priority 32788
             Address 0023.05c9.5e80
             Cost 19
             Port 21 (FastEthernet0/19)
             Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

  Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)
             Address 0023.3307.7000
             Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
             Aging Time 300

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/10 Desg FWD 19 128.12 P2p
Fa0/19 Root FWD 19 128.21 P2p <<<<<<<<<<<<<<<<<<<

SW4#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW4(config)#int f0/19
SW4(config-if)#span guard root <<<<<<<<<<<<<<<<<<<<<
SW4(config-if)#end
SW4#sh span vlan 20

VLAN0020
  Spanning tree enabled protocol ieee
  Root ID Priority 32788
             Address 0023.3307.7000
             This bridge is the root <<<<<<<<<<<<<<<<<<<< AFTER
configuration
             Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

  Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)
             Address 0023.3307.7000
             Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
             Aging Time 15

Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/10 Desg FWD 19 128.12 P2p
Fa0/19 Desg BKN*19 128.21 P2p *ROOT_Inc
<<<<<<<<<<<<<<<<<<<<<<<

SW4#

HTH,

Bob Sinclair

> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Abiola Jewoola
> Sent: Monday, June 21, 2010 2:19 AM
> To: Abdel Bric; Cisco certification; chris
> Subject: Re: STP ROOT BRIDGE PROBLEM!!!!
>
> I thought Root Guard is normally configured on the root bridge. you
> cant
> configure it on non root switches
>
> --- On Wed, 6/16/10, chris <chrish711_at_gmail.com> wrote:
>
> From: chris <chrish711_at_gmail.com>
> Subject: Re: STP ROOT BRIDGE PROBLEM!!!!
> To: "Abdel Bric" <ab4ccie_at_gmail.com>, "Cisco certification"
> <ccielab_at_groupstudy.com>
> Date: Wednesday, June 16, 2010, 3:03 PM
>
> Uplinkfast will indirectly modify the priority. I would use root guard
> in
> the other sitches to make sure this one is not elected ...
>
> On Wed, Jun 16, 2010 at 5:46 PM, Abdel Bric <ab4ccie_at_gmail.com> wrote:
>
> > how about uplinkfast if it is PVST+ mode
> >
> > On Wed, Jun 16, 2010 at 2:53 PM, Narbik Kocharians
> <narbikk_at_gmail.com>wrote:
> >
> >> Puting the switches in diefferent MST domains might also be a valid
> >> solution.
> >>
> >> On Wed, Jun 16, 2010 at 11:47 AM, chris <chrish711_at_gmail.com> wrote:
> >>
> >> > What if the question says:
> >> > >
> >> > > "Make sure sw4 is not elected root bridge without modifying
> priority"
> >> > >
> >> > > Thanks,
> >> > >
> >> > > On Wed, Jun 16, 2010 at 1:07 PM, Ryan DeBerry
> <rdeberry_at_gmail.com
> >> > >wrote:
> >> > >
> >> > >> key phrase - "But i
> >> > >> should not touch thats bridge priority."
> >> > >>
> >> > >> They are giving you the answer.
> >> > >>
> >> > >> Change the other bridge's priorities.
> >> > >>
> >> > >> On Wed, Jun 16, 2010 at 1:03 PM, HEMANTH RAJ
> <hemanthrj_at_gmail.com>
> >> > wrote:
> >> > >>
> >> > >> > In STP I dont want to make a bridge as a root bridge for any
> vlans.
> >> > But
> >> > >> i
> >> > >> > should not touch thats bridge priority.
> >> > >> > How will i make a bridge not to become a root bridge without
> >> touching
> >> > >> their
> >> > >> > bridge priority???
> >> > >> >
> >> > >> > --
> >> > >> > Problems arise Bcoz we talk,prblms r not solve bcoz we dont
> talk So
> >> > gud
> >> > >> r
> >> > >> > bad talk to ur affectionate one's freely
> >> > >> >
> >> > >> > Urs Friendly,
> >> > >> > HP HEMANTH RAJ
> >>
> >> > >> >
> >> > >> >
> >> > >> > Blogs and organic groups at http://www.ccie.net
> >> > >> >
> >> > >> >
> >> >
> _______________________________________________________________________
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> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >> --
> >> Narbik Kocharians
> >> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
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Received on Mon Jun 21 2010 - 08:05:35 ART