Policing And Marking; Policing On Physical Ports - Cisco IE-3000-8TC Software Configuration Manual

Understanding QoS
The policy map can contain the police and police aggregate policy-map class configuration commands,
which define the policer, the bandwidth limitations of the traffic, and the action to take if the limits are
exceeded.
To enable the policy map, you attach it to a port by using the service-policy interface configuration
command.
For more information, see the
information, see the

Policing and Marking

After a packet is classified and has a DSCP-based or CoS-based QoS label assigned to it, the policing
and marking process can begin as shown in
Policing involves creating a policer that specifies the bandwidth limits for the traffic. Packets that exceed
the limits are out of profile or nonconforming. Each policer decides on a packet-by-packet basis whether
the packet is in or out of profile and specifies the actions on the packet. These actions, carried out by the
marker, include passing through the packet without modification, dropping the packet, or modifying
(marking down) the assigned DSCP of the packet and allowing the packet to pass through. The
configurable policed-DSCP map provides the packet with a new DSCP-based QoS label. For
information on the policed-DSCP map, see the
packets use the same queues as the original QoS label to prevent packets in a flow from getting out of
order.
All traffic, regardless of whether it is bridged or routed, is subjected to a policer, if one is configured.
Note
As a result, bridged packets might be dropped or might have their DSCP or CoS fields modified when
they are policed and marked.
You can configure policing on a physical port. For more information about configuring policing on
physical ports, see the
After you configure the policy map and policing actions, attach the policy to an ingress port by using the
service-policy interface configuration command. For configuration information, see the
Policing, and Marking Traffic on Physical Ports by Using Policy Maps" section on page 36-44
"Classifying, Policing, and Marking Traffic by Using Aggregate Policers" section on page

Policing on Physical Ports

In policy maps on physical ports, you can create these types of policers:
•
•
Cisco IE 3000 Switch Software Configuration Guide
36-8
"Configuring a QoS Policy" section on page
"Policing on Physical Ports" section on page
Individual—QoS applies the bandwidth limits specified in the policer separately to each matched
traffic class. You configure this type of policer within a policy map by using the police policy-map
class configuration command.
Aggregate—QoS applies the bandwidth limits specified in an aggregate policer cumulatively to all
matched traffic flows. You configure this type of policer by specifying the aggregate policer name
within a policy map by using the police aggregate policy-map class configuration command. You
"Policing and Marking" section on page
Figure 36-4.
"Mapping Tables" section on page
Chapter 36 Configuring QoS
36-8. For configuration
36-39.
36-10. Marked-down
36-8.
"Classifying,
36-48.
and the
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