From: Henk de Tombe (henk.de.tombe@qi.nl)
Date: Mon Dec 05 2005 - 11:38:07 GMT-3
Hi,
I think Tim is aiming at the "vlan dot1q tag native" command, which makes It
possible to tag every VLAN with .1q even the native VLAN.
@Tim: Please correct me if you didn't mean this feature.
Regards,
Henk
-----Oorspronkelijk bericht-----
Van: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Namens Godswill
Oletu
Verzonden: donderdag 1 december 2005 22:47
Aan: Tim; 'sholy augustine'; ccielab@groupstudy.com
Onderwerp: Re: ISL Vs 802.1Q
Tim,
I might be missing something here, is there other ways of
changing/specifying the native vlan in a dot1q vtp domain? I know of ways to
manipulate the native vlan, untag/tag it, etc but I can't seem to think of
another way of changing the native vlan from the default than to use the
'switchport trunk' command. eg, lets say one have a task like......
Task: 1.1
Configure a dot1q VTP domain between SW1 & SW2, make VLAN 46 the native
VLAN, do not use the 'switchport trunk native vlan' command to accomplish
this task?
Which other method(s) can be use to accomplish this task?
Thanks.
Godswill Oletu
----- Original Message -----
From: "Tim" <ccie2be@nyc.rr.com>
To: "'sholy augustine'" <sholyka@yahoo.com>; <ccielab@groupstudy.com>
Sent: Thursday, December 01, 2005 7:06 AM
Subject: RE: ISL Vs 802.1Q
> Sholy,
>
> From the point of view of the R&S lab, there are really only 2 things
> you need to know regarding the differences between 802.1q and ISL:
>
> - 802.1q is standards based, ISL is proprietary.
>
> - 802.1q defines a "native" vlan, while ISL has no concept of "native"
vlan.
>
> This last point is critical to understand because it has configuration
> implications you must be aware of including among other things that
> the native vlan must be the same on both sides of the link.
>
> Make sure you know every command that can be used to change the native
vlan
> and make sure you know the ramifications of using one command versus
> another.
>
> HTH, Tim
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of sholy augustine
> Sent: Thursday, December 01, 2005 2:45 AM
> To: ccielab@groupstudy.com
> Subject: ISL Vs 802.1Q
>
> Hi,
>
> I have some confusion regarding the difference between ISL and dot1q
> encapsulation. As to my knowledge ISL uses only 10bits (although 15
> bits is reserved) for VLAN ID giving total of 1024 VLAN IDs and dot1q
> uses
> 12 bits giving a total of 4096 VLANs.
>
> When I configure a trunk between 2 3550 switches, I don't see any
> difference between them both in show outputs and in functionality
>
> For both ISL and dot1q the allowed VLAN on the trunk is up to 4096.
> This is an expected behaviour for dot1q, but for ISL why is it giving
> 4096, should it not be 1024 only
>
> Also for ISL encapsulation, native VLAN ID is provided
>
> Kind Regards,
>
> Sholy
>
>
>
>
>
>
>
>
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