Cisco IE-4000 Software Configuration Manual page 628

Configuring QoS
Configuring QoS
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You cannot configure a mixture of Layer 2 and Layer 3 class maps in a child policy map. When you attempt to
associate such a child policy map with a parent policy, the configuration is rejected. However, you can associate
Layer 2 child policies and Layer 3 child policies with different parent-level class maps.
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Per-port, per-VLAN QoS is supported only on 802.1Q trunk ports.
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When the child policy-map attached to a VLAN or set of VLANs contains only Layer 3 classification (match ip dscp,
match ip precedence, match IP ACLs), take care to ensure that these VLANs are not carried on any other port
besides the one on which the per-port, per-vlan policy is attached. Not following this rule could result in improper
QoS behavior for traffic ingressing the switch on these VLANs.

We also recommend that you restrict VLAN membership on the trunk ports to which the per-port, per-VLAN is
applied by using the switchport trunk allowed vlan interface configuration command. Overlapping VLAN
membership between trunk ports that have per-port, per-VLAN policies with Layer 3 classification could also result
in unexpected QoS behavior.
Configuring per-port, per-VLAN QoS includes these tasks:

Creating Child-Policy Class Maps, page 624

Creating Parent-Policy Class Maps, page 626

Creating Child Policy Maps, page 626

Creating a Parent Policy Map, page 627

Attaching a Parent Policy Map to an Interface, page 627
Creating Child-Policy Class Maps
Beginning in privileged EXEC mode, follow these steps to create one or more child-policy class maps:
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