From: Nick (seajay76@nate.com)
Date: Thu Jan 12 2006 - 15:06:54 GMT-3
Hi, guys.
I tested the issue below in my lab.
The SVI never becomes up/up until there is forwarding ports in the relevant VLAN.
The forwarding port may be an forwarding access port to which the VLAN is assigned,
or a trunk port in forwarding state as for the VLAN which the SVI is configured.
Otherwise, the SVI will appear up/down.
HTH
Regards,
Nick
----- Original Message -----
From: "CCIEin2006" <ciscocciein2006@gmail.com>
To: "James Ventre" <messageboard@ventrefamily.com>
Cc: "Michael Brooks" <michaeljbrooks@gmail.com>; "Cisco certification" <ccielab@groupstudy.com>
Sent: Friday, January 13, 2006 2:42 AM
Subject: Re: Switched Virtual Interfaces on Cat3550 vs Cat6500
> So this feature is exclusive to Catalyst 6500's?
>
> On 1/11/06, James Ventre <messageboard@ventrefamily.com> wrote:
>>
>> I still disagree. I think you're confusing AutoState Tracking with
>> Normal AutoState (default).
>>
>> "Normal Autostate Mode
>>
>> Autostate shuts down (or brings up) the Layer 3 interfaces/subinterfaces
>> on the MSFC and the Multilayer Switch Module (MSM) when the following
>> port configuration changes occur on the switch:
>>
>> •When the last port on a VLAN goes down, all the Layer 3
>> interfaces/subinterfaces on that VLAN shut down (are autostated) unless
>> sc0 is on the VLAN or another router is in the chassis with an
>> interface/subinterface in the VLAN.
>>
>> •When the first port on the VLAN is brought back up, all the Layer
>> 3 interfaces on that VLAN that were previously shut down are brought up."
>>
>> There is NO mention of STP here - because it's not used.
>>
>>
>>
> http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_
> guide_chapter09186a008022f27a.html#wp1035450
>>
>> James
>>
>> Michael Brooks wrote:
>>
>> I think I spoke to soon.... even with spanning-tree disabled, the vlan is
>> still remains "spanning tree forwarding" state across the trunk. When you
>> shut the trunk down. The vlan interface does go down as well.
>>
>> SW7(config)#no spanning-tree vlan 7
>>
>> SW7#sho int trunk
>> Port Vlans in spanning tree forwarding state and not pruned
>> Fa0/13 1,*7*,10,18,38,42,57,263
>>
>> So...actually I still believe it has to do with if spanning-tree is
>> forwarding on the vlan.
>>
>> Mike
>>
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