Re: Switched Virtual Interfaces on Cat3550 vs Cat6500

From: James Ventre (messageboard@ventrefamily.com)
Date: Wed Jan 11 2006 - 21:29:13 GMT-3


 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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