You got me curious, so I tried it in my switch.
I created a new VLAN (VLAN 10). I also created an SVI (Interface vlan 10). That SVI had line protocol down. I made one of my switchports a trunk (carrying all VLANs). The line protocol came up on my SVI. I then excluded VLAN 10 (switchport trunk allowed vlan except 10) and the line protocol on my SVI went immediately down. When I added VLAN 10 back in (switchport trunk allowed vlan add 10), line protocol on the SVI came back up. Check to make sure you don’t have some other port allowing VLAN 10 traffic. Brian From: GAURAV MADAN [mailto:[EMAIL PROTECTED] Sent: Wednesday, February 20, 2008 7:42 AM To: Brian K Valentine Cc: [email protected] Subject: Re: [OSL | CCIE_RS] SVI basic query thats what even i thought .. But say I have vlan 10 in vlan database and int vlan 10 .. no acess port for vlan 10 , i have a trunk carrying vlan 10 .. as expected my interface vlan 10 was UP and UP. Now if i remove vlan 10 from trunk ( switchport trunk allowed vlan except 10 ) ; i still have my SVI in UP state. any light on this .. what i have deduced is that presence of vlan in vlan database is only point to be kept in mind. Gaurav Madan. 2008/2/20 Brian K Valentine <HYPERLINK "mailto:[EMAIL PROTECTED]"[EMAIL PROTECTED]>: Hi, I'm new to the study list, but I believe I can contribute to this issue. My understanding is this… In order for the SVI for that VLAN to come "up and up", you need to have an interface on that local switch assigned to that VLAN. In other words, at least one of the ports must have that VLAN assigned to it as an access VLAN or at least one of the ports must be trunking that VLAN. This also implies that the VLAN exists in the local VLAN database. Brian From: HYPERLINK "mailto:[EMAIL PROTECTED]" [EMAIL PROTECTED] [mailto:HYPERLINK "mailto:[EMAIL PROTECTED]" [EMAIL PROTECTED] On Behalf Of GAURAV MADAN Sent: Wednesday, February 20, 2008 1:55 AM To: HYPERLINK "mailto:[email protected]"; [EMAIL PROTECTED] Subject: [OSL | CCIE_RS] SVI basic query Hi All Just wanted to get clearification on something very basic . Under what circumstances do we have int vlan <> in down state ? I know that if we create " int vlan x " and vlan x do not exist in vlan database then there will be no spanning tree instance for this vlan and the int vlan x will be down .. Is there some other case also ; where int vlan x is down .. I note that only vlan presence is the criterai .. Even if i disable STP for this vlan .. i see interface in UP state . Thnx Gaurav Madan. No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.8/1288 - Release Date: 2/19/2008 8:47 PM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.8/1288 - Release Date: 2/19/2008 8:47 PM No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.8/1288 - Release Date: 2/19/2008 8:47 PM No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.8/1288 - Release Date: 2/19/2008 8:47 PM
