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    Configuring a CoS Policy Profile for a 3G Network

    In a 3G network, a class-of-service (CoS) policy profile defines the highest traffic class (and highest priority for the interactive traffic class) that can be accepted at an access point name (APN), and for each traffic class, the maximum bit rate (MBR) and the guaranteed bit rate (GBR). A CoS policy profile also specifies the policer action to take when subscriber traffic exceeds the configured GBR, MBR, or both.

    Before you begin, complete the following tasks:

    • Configure a CoS resource threshold profile.
    • Configure CoS bandwidth pools.
    • Configure a CoS classifier profile.

    To configure a CoS policy profile for a 3G network:

    1. Specify a name for the CoS policy profile.
      [edit unified-edge cos-cac]user@host# edit cos-policy-profiles policy-profile-2
    2. Specify the highest traffic class and, for the interactive class only, the highest traffic handling priority for a PDP context request. Also, allow PDP contexts with a lower-priority traffic class to be upgraded to a higher-priority traffic class.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2]user@host# set traffic-class interactive priority2 upgrade
    3. Specify that the broadband gateway accepts only PDP contexts with a higher allocation and retention priority (ARP) value than the configured ARP when thresholds are exceeded at the APN or system level, and allow the ARP value of a PDP context request to be upgraded.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 allocation-retention-priority]user@host# set gtpv1-arp 3
    4. Configure an MBR for each traffic class. Optionally, you can configure different MBRs for uplink and downlink traffic.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 maximum-bit-rate traffic-class]user@host# set streaming uplink 50000 user@host# set streaming downlink 200000 user@host# set interactive uplink 200000 user@host# set interactive downlink 200000 user@host# set conversational both 250000 user@host# set background both 20000
    5. Upgrade PDP context requests that have a lower MBR than the configured MBR for a traffic class.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 maximum-bit-rate traffic-class]user@host# set upgrade
    6. Configure a GBR for traffic classes. Optionally, you can configure different GBRs for uplink and downlink traffic.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2 guaranteed-bit-rate traffic-class]user@host# set streaming uplink 50000 user@host# set streaming downlink 200000 user@host# set conversational uplink 100000 user@host# set conversational downlink 200000

      Note: When you configure the MBR or GBR for a given traffic class, you can either specify both or uplink and downlink, but you cannot configure a traffic class using both with either the uplink or downlink option. In addition, if you specify the uplink option, you must also specify the downlink option for the traffic class.

    7. Configure the action to take when the MBR for a traffic class exceeds the configured value.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2]user@host# set violate-action set-loss-priority-high

      Note: By default, traffic that exceeds the peak rate is dropped.

    8. Configure the action to take when the actual bit rate for a traffic class exceeds the configured GBR.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-2]user@host# set exceed-action drop

      Note: By default, when subscriber traffic exceeds the peak rate, the PLP is set to “High” and the packet is transmitted.

    Published: 2011-11-17