Re: Ping TOS to test QOS...

Yes, you can test using the TOS CLI extended ping setting. As for the
conversions, IPP to TOS = IPP value * 8 and DSCP to TOS = DSCP value * 4.
Don't forget that if you're going through a switch and QoS is enabled, all
interfaces are "not trusted" by default.

Note, that if you have a real lab and also want to test with a Windows PC,
there is a "-v" TOS option at the command line, but you will have to modify
your TCP/IP settings in your registry for it to actually work...at least in
some versions. The TOS feature in Cisco devices works fine out of the box
though.

Jason

On Wed, Apr 22, 2009 at 3:07 PM, Modular <modulartx_at_gmail.com> wrote:

> I had a thought, (don't laugh, it happens), is it possible to use the TOS
> setting
> in extended Ping to test QOS classification? I did a little research on
> conversion
> of TOS byte setting to IPP or DSCP and the best I could come up with is
> that
> a TOS of 1 or 8 would convert to IPP 1 or DSCP 8? I played around with it
> for awhile, setting up a policy-map to match DSCP 1, DSCP 8 and IPP 1
> and then set to TOS in the extended ping on a different router to 1 and
> none of the class maps in the policy map had packet counts greater than 0.
>
> Either I'm converting TOS to IPP/DSCP wrong or I'm completely off base with
> this.?.?
>
>
> Bryan R.
>
>
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Received on Wed Apr 22 2009 - 15:17:14 ART