From: nhatphuc (nhatphuc@gmail.com)
Date: Thu Dec 13 2007 - 15:05:39 ART
Should i adjust cos-dscp map in lab exam or just in real world?
Thank you for your reply
Phuc
On Dec 13, 2007 7:39 PM, Scott Morris <smorris@ipexpert.com> wrote:
> I'd also adjust your mls qos cos-dscp map then. The default will read cos
> 5
> and remap the dscp to 40 instead of 46.
>
> :)
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> JNCIE-M
> #153, JNCIS-ER, CISSP, et al.
> CCSI/JNCI-M/JNCI-ER
> VP - Technical Training - IPexpert, Inc.
> IPexpert Sr. Technical Instructor
>
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>
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>
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>
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Darren Johnson
> Sent: Thursday, December 13, 2007 6:46 AM
> To: 'nhatphuc'; 'Cisco certification'
> Subject: RE: Trust VoIP and remark Data
>
> Hey there! I believe your second option is wrong, you don't need the
> override and you need to trust cos. I would do it like this....
>
> mls qos trust device cisco-phone
> mls qos trust cos
> mls qos cos 1
>
> This says trust the COS value ONLY if a Cisco phone is detected via CDP,
> and
> any packets/frames without a COS value (such as those received from a PC
> on
> the native vlan) use a COS value of 1. The COS override would 'override'
> any
> COS values to 1, including COS values received from the phone!! I don't
> believe you want to do this!
>
> Dazzler
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> nhatphuc
> Sent: 12 December 2007 17:55
> To: Cisco certification
> Subject: Trust VoIP and remark Data
>
> Hi Group,
>
> With question: Ensure that VoIP traffic originating from the IP phones
> maintains its CoS value, while traffic originating from the PCs is
> remarked
> with a CoS of 1
>
> I see 2 ways to answer. The first seems to be better, but I don't see
> anything wrong with the second. Which one do you choose? Please explain.
>
> mls qos trust cos
> switchport priority extend cos 1
>
> and
> mls qos trust device cisco-phone
> mls qos cos 1 override
>
>
> Thank you
>
> Phuc
>
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