[c-nsp] QoS and VLAN

[Church, Charles]

Steve,

	You have an example of this?  I've found on the platforms I work
on most that you can't use any LLQ (priority keyword) on a subint.  So
I've put a policy handling the priority stuff on the main int, and then
the other shaping/policing stuff on the subint, but have always
questioned its effectiveness, or the order of operation for traffic,
whether it hits the subint policy first, or the main int one.

Thanks,

Chuck


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Steve McCrory
Sent: Wednesday, April 29, 2009 12:40 PM
To: Jay Nakamura; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] QoS and VLAN


Have you tried implementing Modular QoS CLI (MQC) using service
policies?

I haven't worked on the 7500 platform but we have successfully applied
QoS for VoIP on subinterfaces on the 7200 series routers.

It should be noted that on sub-interfaces, you need a parent service
policy to shape traffic to a particular level and then a child service
policy which will carry out the actual QoS markings/prioritizations
within the shaped allowance. 

Steven
 
Steven McCrory
 
Senior Network Engineer
 
Netservices PLC
Waters Edge Business Park
Modwen Road
Manchester, M5 3EZ
 
www.netservicesplc.com
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jay Nakamura
Sent: 29 April 2009 16:36
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] QoS and VLAN

We have several customers coming in on Ethernet.  They are connected
to L2 switch and trunked into a 7500 router via VLAN.  This has worked
fine so far with the use of rate-limit on the sub-interface.  Most
customers have 5~10mbps.

However, we are increasingly needing QoS so VoIP traffic does not drop
when data traffic bursts.  Only work around I know how to do is to
give separate rate-limit based on IP address since most of the time
VoIP has separate gateway on the customer side than the data firewall.

Classification of the traffic is not a problem.  The issue is, how do
you give VoIP traffic priority over data traffic on a Ethernet
sub-interface?

Is there a good way to implement this on a 7500?  If not, what Cisco
hardware will work?  We are on a tight budget and the number of
clients are small.  (dozen or so)  Would going with L3 switch be
better?  If so, what model?

Thanks!
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