[c-nsp] QoS in Enterprise Network Survey ish..

[Brad Henshaw]

SV> Personally I do a combination of both DSCP and IP Prec. With 
SV> a Match any statement.
SV> 
SV> Let the equipment do the work, but only trust the equipment 
SV> you know you want to trust and zero out everything else.

I stick to DSCP where possible - if you put a sane QoS model in place
(i.e. utilise the AF classes) then Precedence should work ok as well.

To add to Scott's comments, if possible on your gear then it's also a
good idea to police the trusted traffic to its expected rate + some
margin (if realtime traffic) or markdown to a scavenger class if it's
other latency-insensitive traffic. This way you can ensure users can't
ensure priority of their own traffic or overrun queues simply by marking
everything to a certain DSCP value. (or broken apps can't do the same)

The concepts in Cisco's various QoS design guides are mostly scalable to
small networks as well.

Regards,
Brad

 

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Voll, Scott
> Sent: Tuesday, 27 March 2007 1:53 AM
> To: Joseph Jackson; Cisco-NSP Mailing List
> Subject: Re: [c-nsp] QoS in Enterprise Network Survey ish..
> 
> Personally I do a combination of both DSCP and IP Prec. With 
> a Match any statement.
> 
> Let the equipment do the work, but only trust the equipment 
> you know you want to trust and zero out everything else.
> 
> Scott
> 
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Joseph Jackson
> Sent: Friday, March 23, 2007 4:43 PM
> To: Cisco-NSP Mailing List
> Subject: [c-nsp] QoS in Enterprise Network Survey ish..
> 
> Hey all,
> 
> 
> 	We currently have a smallish network with 10 
> routes/remote sites.  I would like to do QoS on the WAN links 
> (T1's and DS3's) but I was wondering what others thought of 
> as the best way to mark the packets.  The video conferancing 
> products we use can be configured to mark their packets with 
> DSCP values.  Is it better to trust the DSCP values on the 
> interfaces or have the router/switch/ assign a DSCP value?
> 
> 
> 
> Thanks!
> 
> Joseph
> 
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