Shared Policers; Licensing Requirements; Prerequisites For Policing - Cisco Nexus 7000 Series Configuration Manual

Shared Policers

You can configure only one action for each condition. For example, you might police for traffic in a class to
conform to the data rate of 256000 bits per second, with up to 200 millisecond bursts. The system would apply
the conform action to traffic that falls within this rate, and it would apply the violate action to traffic that
exceeds this rate.
Color-aware policers assume that traffic has been previously marked with a color. This information is then
used in the actions taken by this type of policer.
For more information about policers, see RFC 2697 and RFC 2698.
Shared Policers
QoS applies the bandwidth limits specified in a shared policer cumulatively to all flows in the matched traffic.
A shared policer applies the same policer to more than one interface simultaneously.
For example, if you configure a shared policer to allow 1 Mbps for all Trivial File Transfer Protocol (TFTP)
traffic flows on VLAN 1 and VLAN 3, the device limits the TFTP traffic for all flows combined on VLAN
1 and VLAN 3 to 1 Mbps.
The following are guidelines for configuring shared policers:
• You create named shared policers by entering the qos shared-policer command. If you create a shared
• You define shared policers in a policy map class within the police command. If you attach a named
• Shared policing works independently on each module.

Licensing Requirements

The QoS feature does not a require license. Any feature not included in a license package is bundled with the
Cisco NX-OS system images and is provided at no extra charge to you.
Using virtual device contexts (VDCs) requires an Advanced Services license.
For a complete explanation of the Cisco NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide.

Prerequisites for Policing

Policing has the following prerequisites:
• You must be familiar with "Using Modular QoS CLI."
• You are logged on to the switch.
• You are in the correct VDC. A VDC is a logical representation of a set of system resources. You can use
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policer and create a policy using that shared policer and attach the policy to multiple ingress ports, the
device polices the matched traffic from all the ingress ports to which it is attached.
shared policer to multiple ingress ports, the device polices the matched traffic from all the ingress ports
to which it is attached.
the switchto vdc command with a VDC number.
Configuring Policing