Go CCIE Go!! - A Cisco Certified Internetwork Expert

As for subinterface example.
Let’s imagine that we have FastEthernet with two vlans: 10 and 20
We want to limit sending rate to every VLAN up to 1Mbs, and provide some traffic reservation at the same time. Say give RTP priority, and guarantee HTTP 384Kb on every vlan.
We can not directly put CBWFQ at subinterface - subinterface is never congested, hence queueing in never activated. So we need to come with a little bit more complicated idea.
First, we create CBWFQ strategy:
class-map VOICE match protocol rtp
class-map HTTP match protocol http
policy-map CBWFQ class VOICE priority 128 class HTTP bandwith 384
Now, we should shape ALL the subinterface traffic to 1Mbs:
policy-map VLAN10_SHAPE class class-default shape average 1000000 service-policy CBWFQ
interface fastethernet 0/0.10 encapsulation dot1q 10 ip address 10.10.10.1 255.255.255.0 service-policy output VLAN10_SHAPE
So now we shape all VLAN10 traffic to 1Mbs, yet give some traffic priority treatment.
HTH Petr