From: Nick (seajay76@nate.com)
Date: Thu Jan 12 2006 - 23:15:08 GMT-3
Hi, Faruqui!
Yes, in most live network, 4500s and 6500s are set up in pairm and
they are connected via trunk link(usually on Gigabit Ether Channel)
That's why the SVI is up even when there is no interface assigned to the vlan.
Would you please do "show spanning-tree vlan x" for the vlan of which the SVI is up
and there is no port assigned?
It will show you the trunk port as a forwarding port for that VLAN.
Regards,
Nick
----- Original Message -----
From: Anis Faruqui
To: Nick
Sent: Friday, January 13, 2006 7:44 AM
Subject: Re: Switched Virtual Interfaces on Cat3550 vs Cat6500
For My observation WE do have a couple of 3750's and 4500 as well as 6500 and a lot of vlans What I have observed is that in 3750s the vlan or vlan interface does not come up untill you provide a physcial access prot to it when it's UP the vlan is up and when it's down the Vlan is down.
while in case of 4500 and 6500 the Vlans and thier corresponding Interface remain UP.without assigning any physical interface to it wether it's UP.
regards,
Anis Faruqui
On 1/12/06, Nick <seajay76@nate.com> wrote:
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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