[c-nsp] How to QoS Voice on a Cisco LNS (How to attach aservice-policy to a Virtual-Interface?)

[Arie Vayner]

We are using 7300's for something similar.
We load a per user CAR policy for both upstream and downstream policing from RADIUS and it works perfectly.
We have been experimenting with a policy-map per virtual access and it seems to work as well, as long as you pre-define all the policies in the global config.
I have never tested a priority queue with such a config, but it's a cpu based platform so it should support it...

Arie Vayner
CCIE#12198
 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Alexander Lucke
Sent: Wednesday, February 16, 2005 5:06 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] How to QoS Voice on a Cisco LNS (How to attach aservice-policy to a Virtual-Interface?)

Hi,

I have a problem with QoS and hope that someone else already solved such a problem and can help me here.

What I need to do is prioritizing Voice traffic on SDSL lines. 

For the upstream part, this is no problem as the CPE (a small cisco router) can do QoS on the ethernet interface. My problem is the downstream part. My LNS (Cisco 7206VXR/300) gets the PPPoE-DSL sessions via L2TP over a FastEthernet interface. I configured some vpdn-groups and some virtual-templates and everything works fine with normal data traffic. 

My problem is that - when reading some documentation (e.g. http://www.cisco.com/warp/public/105/pppoe_qos_dsl.html) - it seems impossible to do a "session based queueing/shaping/whatever". It seems only to support marking.

Did anybody solve this issue? How is it possible to let an LNS prioritize Voice traffic in the downstream direction?

And No, we do not have access to the DSLAMs or the DSL aggregation network but let's assume that we don't have congestion (no overbooking ;-) here.

Viele Grüße
Alexander Lucke
 
--
alexander lucke · managing director
DNS:NET internet service gmbh · ostseestrasse 111 · 10409 berlin http://www.dns-net.de · phone +49-30-420278-22 · fax +49-30-420278-78


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