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    Configuring a CoS Policy Profile for a 4G Network

    In a 4G network, a class-of-service (CoS) policy profile defines the highest quality-of-service (QoS) Class Identifier (QCI) value that can be accepted at the access point name (APN) level or system level, the aggregate maximum bit rate (AMBR) for default bearers, and the allocation and retention priority (ARP). A CoS policy profile also specifies the policer action to take when subscriber traffic exceeds the configured AMBR.

    By default, when a bearer request has a higher AMBR value than the value configured in the CoS policy profile, the bearer request is downgraded.

    Before you begin, complete the following tasks:

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

    To configure a CoS policy profile for a 4G network:

    1. Specify a name for the CoS policy profile:
      [edit unified-edge cos-cac]user@host# edit cos-policy-profiles policy-profile-1
    2. Specify the highest QCI that can be accepted at the APN or system level, and specify upgrade to allow bearers with a lower priority QCI value to be upgraded to a higher priority QCI value.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-1]user@host# set qos-class-identifier 5 upgrade
    3. Configure the aggregate maximum bit rate for traffic:
      1. Configure the aggregate maximum bit rate for downlink traffic.
        [edit unified-edge cos-cac cos-policy-profiles policy-profile-1 aggregated-maximum-bit-rate]user@host# set downlink 250000
      2. Configure the aggregate maximum bit rate for uplink traffic.
        [edit unified-edge cos-cac cos-policy-profiles policy-profile-1 aggregated-maximum-bit-rate]user@host# set uplink 70000

        Note: When you configure the AMBR, you can either specify both or uplink and downlink, but you cannot configure both with either the uplink or downlink option. In addition, if you specify the uplink option, you must also specify the downlink option.

      3. Configure the policy profile to either upgrade or reject bearer requests based on the AMBR value specified in the user packet:

        • To upgrade bearer requests that specify a lower AMBR than the configured AMBR:
          [edit unified-edge cos-cac cos-policy-profiles policy-profile-1 aggregated-maximum-bit-rate]user@host# set upgrade
        • To reject new bearer requests that specify a higher AMBR than the configured AMBR.
          [edit unified-edge cos-cac cos-policy-profiles policy-profile-1 aggregated-maximum-bit-rate]user@host# set reject

          Note: When the reject option is configured, the broadband gateway rejects any Create Session requests with a higher AMBR value than the configured AMBR. However, Modify bearer requests with a higher AMBR value are downgraded to the configured AMBR.

    4. Specify that bearer requests with a lower allocation and retention priority level (PL) than the configured value can be upgraded.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-1 allocation-retention-priority]user@host# set gtpv2-priority-value 7 upgrade
    5. Configure the action to take when the AMBR of bearer traffic exceeds the peak rate.
      [edit unified-edge cos-cac cos-policy-profiles policy-profile-1 aggregated-maximum-bit-rate]user@host# set violate-action set-loss-priority-high

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

    Published: 2011-11-17