Easy Traffic Shaping in Cisco IOS
You can enable shaping on an interface (or sub-interface) in three easy steps. Just remember: class, policy, interface.
- class-map match-any CLASS_SLAP
- match any
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
- policy-map POLICY_SLAP
- class CLASS_SLAP
- shape average 8000000
Now it's time to define our policy map. In this case, we're going to take any traffic that matched the
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
, which has a similar effect. Unfortunately, a policy map utilizing the
configuration command can not be applied to a sub-interface. This limitation may not be a problem for you, though.
- interface GigabitEthernet0/3.429
- encapsulation dot1Q 429
- service-policy output POLICY_SLAP
Finally, we need to apply the policy map to an interface using the
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?