From: Bob Sinclair (bsin@cox.net)
Date: Sat Nov 15 2003 - 00:59:26 GMT-3
Tasuka,
Looks to me like instruction 1 is pointing to VTP pruning.
I think these instructions are telling us to allow only the listed vlans
across the link. The 3550 will allow you to remove vlan 1 from a trunk, so
I would do that and make another vlan native. CDP and VTP will come out
with vlan 1 tags, but no other vlan 1 traffic will be seen.
I guess #3 is talking about UDLD? Maybe someone else can help on this?
Good catch on the "vlan dot1q tag native " command.
Hope that helps,
-Bob Sinclair
CCIE #10427, CISSP, MCSE
bsin@cox.net
----- Original Message -----
From: "Tasuka Amano Hsu" <tasuka@mac.com>
To: "ccielab Groupstudy" <ccielab@groupstudy.com>
Sent: Friday, November 14, 2003 11:25 AM
Subject: 3550 Switch VLAN native ?
> Hi, my english not very well, so I need to make sure the I am
> understand what it said:
>
> 1.If a downstream switch does not process a port in a VLAN that your
> switch is advertising, you are responsible for making sure that your
> switch does not propagate broadcast traffic for those VLANs.
>
> 2.Create VLANs 10,20,30,40,55,70 and 100. Name each VLAN; VLAN_A,
> VLAN_B. etc.
>
> 3.Configure the two interfaces connecting the 3550's to appear as 1
> link to STP, If either of the interface is damaged, both switches
> should actively manage one-way links.
>
> 5.This link should allow all VLANs to travel across with their VLAN ID
> in tact. You can not use Cisco Proprietary protocol to archive this.
> Every packet that traverses the link must have the VLAN ID, no
> exceptions.
>
> 6.Only allow the defined VLANs across this link.
>
> So I will configure a port group with a 802.1q trunk mode and make sure
> that link has a native VLAN tag for un-tag traffic packets, but does
> that mean I can use VLAN 1 ? or VLAN 10 as the native VLAN. and just
> allow the define VLAN traffic passthrough the switch, does it need
> include VLAN 1 ?
>
>
> Sincerely,
> Tasuka
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Fri Dec 12 2003 - 12:29:12 GMT-3