From: MMoniz (ccie2002@tampabay.rr.com)
Date: Wed May 05 2004 - 17:32:20 GMT-3
I understand ISL has no native vlan concept on a trunking basis and is Cisco
proprietary.
From the Cat config guide
Configuring Ports to Carry Voice Traffic in 802.1P Priority-Tagged Frames
Beginning in privileged EXEC mode, follow these steps to configure a port to
instruct the IP phone to give voice traffic a higher priority and to forward
all traffic through the native VLAN.
Step 5
switchport voice vlan dot1p
Instruct the switch port to use 802.1P priority tagging for voice traffic
and to use the default native VLAN (VLAN 0) to carry all traffic. By
default, the Cisco IP phone forwards the voice traffic with an 802.1P
priority of 5.
-----Original Message-----
From: boby2kusa [mailto:boby2kusa@hotmail.com]
Sent: Wednesday, May 05, 2004 4:24 PM
To: MMoniz; Kenneth Wygand; ccielab@groupstudy.com
Subject: Re: 802.1q/p
----- 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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