Classification Based On Qos Acls - Cisco IE 3000 Software Configuration Manual

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Understanding QoS

Classification Flowchart

Is a policer configured

Check if the packet is in

profile by querying the policer.

Classification Based on QoS ACLs

You can use IP standard, IP extended, or Layer 2 MAC ACLs to define a group of packets with the same

characteristics (class). In the QoS context, the permit and deny actions in the access control entries

(ACEs) have different meanings than with security ACLs:

When creating an access list, remember that, by default, the end of the access list contains an implicit

deny statement for everything if it did not find a match before reaching the end.

Cisco IE 3000 Switch Software Configuration Guide

Get the clasification

result for the packet.

for this packet?

Check out-of-profile action

configured for this policer.

Modify DSCP according to the

policed-DSCP map. Generate

If a match with a permit action is encountered (first-match principle), the specified QoS-related

action is taken.

If a match with a deny action is encountered, the ACL being processed is skipped, and the next ACL

is processed.

If no match with a permit action is encountered and all the ACEs have been examined, no QoS

processing occurs on the packet, and the switch offers best-effort service to the packet.

If multiple ACLs are configured on a port, the lookup stops after the packet matches the first ACL

with a permit action, and QoS processing begins.

a new QoS label.

Configuring QoS

Drop packet.

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