From: Bajo (bajoalex@gmail.com)
Date: Thu Aug 31 2006 - 15:12:36 ART
Go it Victor. ...Thanks to all.
On 8/31/06, Victor Cappuccio <cvictor@protokolgroup.com> wrote:
>
> Hi Friend Bajo,
>
> When you apply the macro spanning-tree vlan 1 root primary, it going to
> generate for you something in the configuration like spanning-tree vlan 16
> priority 24576
> So for example if you set the priority manually at Sw2
>
> Rack3Sw2(config)#spanning-tree vlan 1 priority 4096
> Rack3Sw2(config)#
> BB1-TS#7
> [Resuming connection 7 to sw1 ... ]
>
> Rack3Sw1(config)#do show spanning-tree vlan 1
>
> VLAN0001
> Spanning tree enabled protocol ieee
> Root ID Priority 4097
> Address 000e.84d0.d380
> Cost 19
> Port 15 (FastEthernet0/15)
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
>
> Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
> Address 000b.5f55.f800
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
> Aging Time 600
>
> Interface Role Sts Cost Prio.Nbr Type
> ---------------- ---- --- --------- --------
> --------------------------------
> Fa0/15 Root FWD 19 128.15 P2p
>
> Now If I set the macro at the switch the priority should be reduced
>
> Rack3Sw1(config)# spanning-tree vlan 1 root primary
> Rack3Sw1(config)#do show run | in prio
> spanning-tree vlan 1 priority 4096
> ip ospf priority 255
> ip ospf priority 255
> Rack3Sw1(config)#do show spann vlan 1
>
> VLAN0001
> Spanning tree enabled protocol ieee
> Root ID Priority 4097
> Address 000b.5f55.f800
> This bridge is the root
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
>
> Bridge ID Priority 4097 (priority 4096 sys-id-ext 1)
> Address 000b.5f55.f800
> Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
> Aging Time 15
>
> Interface Role Sts Cost Prio.Nbr Type
> ---------------- ---- --- --------- --------
> --------------------------------
> Fa0/15 Desg FWD 19 128.15 P2p
>
> HTH
> Victor.-
>
>
>
> -----Mensaje original-----
> De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de
> sabrina pittarel
> Enviado el: Jueves, 31 de Agosto de 2006 01:36 p.m.
> Para: Bajo; Cisco certification
> Asunto: Re: spanning-tree vla XX root and "sh run"
>
> No,
> spanning-tree vla XX root is a macro command.
>
> It sets the local bridge priority to be less than the current lowest
> priority in your switched network ("how much" lower is well defined, but I
> don't have the rule on the top of my mind ), essentially it kicks away
> your
> current root bridge.
> BUT if you later add another switch with an even lower priority then the
> new bridge will become root.
>
> Leaving the "spanning-tree vla XX root" in the running config gives you
> the
> wrong idea that this switch will be root no matter what. That's not the
> case
>
> Sabrina
>
>
> ----- Original Message ----
> From: Bajo <bajoalex@gmail.com>
> To: Cisco certification <ccielab@groupstudy.com>
> Sent: Thursday, August 31, 2006 9:08:31 AM
> Subject: spanning-tree vla XX root and "sh run"
>
> Hi GS,
>
> Is it an IOS bug that the "sh run | in spannin" will NOT show the
> spanning-tree vlan XXXX root config?
>
> I know I can check if the config works by doing "sh spann vla XXXX"
>
> Check this out:
>
> CAT1) conf t
> CAT1(config)#spann vl 16 root pri
> CAT1(config)#end
>
> CAT1#sh run | in spann
> spanning-tree mode pvst
> spanning-tree extend system-id
> spanning-tree vlan 16 priority 24576
> spanning-tree vlan 16 port-priority 32
> spanning-tree vlan 16 port-priority 16
>
>
>
> CAT1#sh ver
> Cisco Internetwork Operating System Software
> IOS (tm) C3550 Software (C3550-I5Q3L2-M), Version 12.1(20)EA1a, RELEASE
> SOFTWARE (fc1)
>
>
> --
> Kind Regards,
>
> Bajo
>
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>
-- Kind Regards,Bajo
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