From: boby2kusa (boby2kusa@hotmail.com)
Date: Wed May 05 2004 - 17:23:38 GMT-3
----- Original Message -----
From: "MMoniz" <ccie2002@tampabay.rr.com>
To: "Kenneth Wygand" <KWygand@customonline.com>; <ccielab@groupstudy.com>
Sent: Wednesday, May 05, 2004 1:17 PM
Subject: RE: 802.1q/p
> Kenneth, if I understand this correctly, when you use 802.1p on the Cat,
(I
> assume you are talking about the Cat)
> You are basically using ISL functionality. Voice packets will be tagged
with
> an 802.1p priority of 5 and all traffic will use the native VLAN for
> traffic, so no seperate voice VLAN.
In ISL there is no native vlan concept. All the vlans are tagged.
>
> 802.1q allows for seperate VLAN's for both voice and data. Kind of a
psuedo
> trunk. Each can have traffic marked accordingly.
ISL and Dot1Q are both turnking protocol. the diffrence is ISL is Cisco
prop. the Dot1Q is the Industry standard.
>
> Look at these 2 different IOS Cat links. One is older 12.1.14 and the
other
> is 12.1.19. So there are some minor dif's
>
>
http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration
> _guide_chapter09186a00801a6b2e.html#1034347
>
>
>
http://www.cisco.com/en/US/products/hw/switches/ps646/products_configuration
> _guide_chapter09186a00801cdf35.html
>
> Mike
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Kenneth Wygand
> Sent: Wednesday, May 05, 2004 3:41 PM
> To: ccielab@groupstudy.com
> Subject: 802.1q/p
>
>
> Is 802.1p just the ISO standard nomenclature for the IP COS bits in an
> 802.1q frame? In other words, if a question says "make sure to use
> 802.1p for QoS" or "make sure to set high priority with 802.1p", does
> this just mean make sure to set the COS bits within an 802.1q frame?
>
>
>
> Sorry if this seems like a basic question, but I can't find any
> documentation that specifically solidifies this concept. I just want to
> make sure that I completely understand what is implied when a
> requirement is presented to employ 802.1p.
>
>
> Thanks!
>
>
>
> Kenneth E. Wygand
> Systems Engineer, Project Services
>
> CISSP #37102, CCNP, CCDP, ACSP, Cisco IPT Design Specialist, MCP, CNA,
> Network+, A+
> Custom Computer Specialists, Inc.
>
> "I am not really smart. I just stick with problems longer."
> -Albert Einstein
>
>
>
> Custom Computer Specialists, Inc.
>
> "Celebrating 25 Years of Excellence"
>
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>
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