Easy Traffic Shaping in Cisco IOS

en August 17 , 2018
You can enable shaping on an interface (or sub-interface) in three easy steps. Just remember: class, policy, interface.



On the router, we have the ability to tell the class map to match any traffic. This is in contrast to the Catalyst switch where we had to specify an access-list to match on. This saves us a step and achieves the exact same results. In this case, we are going to assign all traffic to the CLASS_SLAP class.



Now it's time to define our policy map. In this case, we're going to take any traffic that matched the CLASS_SLAP class (which, as you remember, is all traffic) and apply a shaping policy to it. We use the shape average 8000000 configuration command to limit our speed (the CIR) to 8 Mbps. Another configuration command available for a policy map is bandwidth, which has a similar effect. Unfortunately, a policy map utilizing the bandwidth configuration command can not be applied to a sub-interface. This limitation may not be a problem for you, though.



Finally, we need to apply the policy map to an interface using the service-policy configuration command. In this example, I used a sub-interface to make the example a little more applicable to real word circumstances. I've also applied the policy map in the outbound direction. Thus, the users of VLAN 429 are only allowed to download at an aggregate of 8 Mbps.
Wasn't that easy? How do your own experiences compare?
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