[nsp] Traffic shaping with QoS on Cisco 3550

[Brad Bonin (bbonin)]

Try this...assuming no congestion(then you will need WRED and egress
queue configuration)

The key is to mark packets using dscp values coming in from Internet and
police outbound toward the customer based upon dscp values.

Ingress Side (Upstream ISP connection)
1.  define a class-map to match ingress traffic on your network side
interface (upstream) via an acl.
2.  define a policy-map that sets a dscp value to traffic that matches
the class-map defined in step 1.
3.  apply service-policy to upstream interface (specify "input")

Egress Side (toward the customer)
1. define a class-map to match traffic based upon dscp values (values
you marked on the trunk side ingress policy)
2. define a policy-map that polices at a specified rate, traffic that
matches the class-map defined in step 1.
3. apply service-policy to customer interface (specify "output")


So, you could build predefined dscp values, one value for 1Mbps service,
one for 2Mbps service, etc.  Then apply standard outbound policers that
match the dscp values.  

Let me know if you have problems...I may have simplified it too much:-)

Brad
brad at cisco.com

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Olav Langeland
Sent: Tuesday, February 25, 2003 7:40 AM
To: cisco-nsp at puck.nether.net
Subject: [nsp] Traffic shaping with QoS on Cisco 3550


We have bought some of these nice beasts, but I some trouble
understanding parts of traffic shaping with QoS. We plan to use them
with co-lo servers where one customer is one VLAN, a customer have a /30
net, typically shaped at 2Mbit, the VLAN have an IP which is the default
GW for customer network. 
I have been reading up on "Understanding QoS Policing and Marking on the
Catalyst 3550" (http://www.cisco.com/warp/public/473/153.html), and got
the part about ingress traffic and policing down traffic. But I have
trouble grasping how to configure egress traffic (switchport -> server),
this is limited to Policer Markdown and Match DSCP which isnt described
properly in the document. Looking for examples of traffic shaping with
egress traffic..

with regards
Olav Langeland <> olav.langeland at activeisp.com http://www.activeisp.com
<> +47 21 93 30 51

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