From: Kenneth Wygand (KWygand@customonline.com)
Date: Thu Feb 26 2004 - 11:54:49 GMT-3
Yasser,
This is not an option - it is a protocol specification. There is really
no advantage or disadvantage to either one AFAIK. ISL (cisco
proprietary) calls for tagging all VLANs in its implementation while the
industry standard 802.1Q does not.
Real world - Cisco is moving from ISL and adopting 802.1Q. Some new
switches (2950's I believe), do not even support ISL anymore - its now
802.1Q only.
HTH,
Kenneth E. Wygand
Systems Engineer, Project Services
CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
Network+, A+
Custom Computer Specialists, Inc.
"The only unattainable goal is the one not attempted."
-Anonymous
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Yasser Aly
Sent: Thursday, February 26, 2004 9:43 AM
To: tyson.scott@hp.com; jmatus@pacbell.net; ccielab@groupstudy.com
Subject: RE: cat3550 vlan question: ipexpert manual
Tyson,
Maybe away from the original question but do you know when it is
preferrable to tag or untag the native VLAN traffic ?
Consider this as a design question rather than a lab question.
Regards,
Yasser
>From: "Scott, Tyson C" <tyson.scott@hp.com>
>Date: Thu, 26 Feb 2004 07:40:16 -0600
>
>By default Native VLAN 1 with 802.1q trunking is not tagged but you can
>tag it issuing the command vlan dot1q tag native in global
configuration
>mode. But the question below his question is no you do not want to
>prune vlan 1 because the question is stating make sure VLAN 1 is not
>tagged which is asking you to use dot1q trunking. If you pruned it you
>would not have an untagged VLAN running across the etherchannel so you
>would be effectively not fulfilling the requirements of the question.
>
>Regards,
>
>Tyson Scott
>Agilent Problem Management Team
>Managed Network Services
>Phone: 313-583-5812
>Pager: 877-997-0811
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Yasser Aly
>Sent: Thursday, February 26, 2004 6:50 AM
>To: jmatus@pacbell.net; ccielab@groupstudy.com
>Subject: RE: cat3550 vlan question: ipexpert manual
>
>Hello,
>
>dot1q encapsulation on a trunk will tag all the VLANs except the native
>vlan.
>
>By default native vlan is vlan 1.
>If asked to make vlan 10 untagged in this scenario, it simply means to
>change the native vlan using the following command: " switchport trunk
>native vlan 10 "
>
>If asked to tag all vlans - including the native vlan - then it means
to
>use
>isl encapsulation method.
>
>HTH,
>Yasser
>
>
> >From: jmatus@pacbell.net
> >Reply-To: jmatus@pacbell.net
> >Date: Thu, 26 Feb 2004 02:07:15 -0500
> >
> >hi there,
> >there is a task that comes up repeatedly in this manual for the
> >catalyst3550's. the task states:
> >
> >configure layer 2 etherchannel group on fa0/23 and 0/24 of both
>switches.
> >use ieee standard trunking rotocol and make sure ONLY VLAN 1 can
carry
>non
> >tagged frames.
> >
> >i can confugre the etherchannel just fine and use dot1q for the
>protocol,
> >but i have no idea what "make sure ONLY vlan 1 can carry non tagged
> >frames" means. the channel group is a trunk so i would think expect
it
>to
> >carry tagged frames....so would this mean to remove/prune vlan 1 from
>this
> >trunk? or is it something different?
> >
> >thanks in advance for you help!
> >john d. matus
> >
>
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