Solved

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

Posted on 2011-09-19
3
612 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
Comment Utility
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
Comment Utility
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
Comment Utility
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

Maximize Your Threat Intelligence Reporting

Reporting is one of the most important and least talked about aspects of a world-class threat intelligence program. Here’s how to do it right.

Join & Write a Comment

I have seen some questions on problems with SSH/telnet access to Cisco routers that may occur despite the fact that from a PC connected to your LAN, Internet connectivity is in place and users can access Internet sites without any issues.  There are…
Cable Modem Provisioning from DPoE compliant server  This Article is to support CMTS administrators to provide an overview of DOCSIS compliance configuration file, and to provision a cable modem located at customer place from a Back office serve…
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…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

743 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

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now