Solved

Effects of Qos on Cisco 7204, NPE-G1, 12.3(14)T7

Posted on 2011-09-19
3
619 Views
Last Modified: 2012-06-22
Hi All,

Is there any information available about the effects of QoS on a Cisco 7204 NPE-G1 CPU?

Looking to implement QoS to DSL subscribers via Radius reply attribute on the Virtual-Access interfaces but not sure of the impact to the Cisco LNS terminating the PPP sessions

e.g.
A Policy-Map is configured to prioritise DSCP Marked VoIP traffic (Downstream) towards a users DSL Router, when the PPP session is authenticated, the Policy-Map is applied to the Virtual Interface and traffic is prioritised towards the end-user.

Question is, if I have this Policy applied to a large number of Virtual Access Interfaces on the LNS router, what effect will it have on CPU/Memory?

Is this just a matter of try and see or are there some references to effects of QoS on CPU etc.

Thanks in advance

Stephen
0
Comment
Question by:DScouser
  • 2
3 Comments
 
LVL 18

Accepted Solution

by:
jmeggers earned 250 total points
ID: 36560356
No hard data I'm aware of.  I suspect somewhere deep inside the bowels of Cisco there are test results but those are generally not available to the public.  If you have a Cisco account team you work with, check with the SE, he should have access to BU contacts and may be able to find something.

What are you defining as a "large number of Virtual Access Interfaces"?  AFAIK, QoS doesn't generally add a great deal of processing power; the router still has to queue the packets, QoS just gives it guidance on what packets should be queued where.  Unless you're already running high CPU or memory, I wouldn't think it would make a huge difference, but it's been a long time since I've dealt with PPP so don't hold me to that.
0
 

Author Comment

by:DScouser
ID: 36566037
Thanks for the reply,

I think you are right about this info not being available, been hard to find any kind of performance stats when applied to DSL subscriber sessions.  Each device terminates about 2,500 sessions but not all will have QOS applied so it may be OK.

Will just have to add it as a possible risk.

I'm meeting Cisco tomorrow so will see if they have any info and report back

Cheers
0
 

Author Comment

by:DScouser
ID: 36585978
Spoke to a Cisco engineer this week about this, he says that a customer of his runs a 7200 NPE-G1 with approx 3,000 QoS sessions and CPU runs at nearly 80-85%

As I will not be activating QoS on every session I may be OK
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Sometimes you have to pull out old tricks to get a new firewall to work… While we were installing a new Sonicwall at a customers site we found that sites they were able to visit before were not working.  It seemed random and we could not understa…
How to set-up an On Demand, IPSec, Site to SIte, VPN from a Draytek Vigor Router to a Cyberoam UTM Appliance. A concise guide to the settings required on both devices
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question