Subscriber QoS overrides

Subscriber QoS overrides enable per-subscriber and per-SLA Profile Instance QoS parameter customization to reduce the amount of sub-profiles and sla-profiles that must be configured on the router to cover all needed service level combinations.

Subscriber QoS overrides can be installed at subscriber host or session creation:

• with an Alc-Subscriber-QoS-Override VSA in a RADIUS Access-Accept message

• with a Charging-Rule-Install/Charging-Rule-Definition/QoS-Information AVP in a DIAMETER Gx CCA message

  Note:

  To use the APN-Aggregate-Max-Bitrate-DL and APN-Aggregate-Max-Bitrate-UL AVPs for QoS overrides, a corresponding 3gpp-qos-mapping must be configured in the DIAMETER Gx application policy:

  >config>subscr-mgmt>diam-appl-plcy>gx>3gpp-qos-mapping>

  [no] apn-ambr-dl - Configure the APN-AMBR mapping for the downlink

  [no] apn-ambr-ul - Configure the APN-AMBR mapping for the uplink

Subscriber QoS overrides can be installed, updated or removed in a mid-session change with a RADIUS CoA, a DIAMETER Gx RAR or a DIAMETER Gx CCA message using the same attributes as for a subscriber host or session creation.

Subscriber QoS overrides can also be activated using subscriber services. See QoS override-based subscriber service for details.

The format of the [26.6527.126] Alc-Subscriber-QoS-Override VSA is described in the 7450 ESS, 7750 SR, and VSR RADIUS Attributes Reference Guide.

The format of QoS Overrides AVP's in the 3GPP-1016 QoS-Information AVP are described in the 7750 SR Gx AVPs Reference Guide.

The following SLA profile instance QoS parameters can be overridden:

• ingress and egress queue: pir, cir, mbs, cbs

• ingress and egress policer: pir, cir, mbs, cbs

• egress queue class weight (applies to HSQ card only)

• egress queue wrr weight (applies to HSQ card only)

• egress aggregate rate (applies to HSQ card only)

• egress wrr group: rate, class weight (applies to HSQ card only)

The following subscriber QoS parameters can be overridden:

• egress aggregate rate

• ingress and egress root arbiter rate

• ingress and egress intermediate arbiter rate

• ingress and egress user scheduler: rate, cir

  The ingress and egress user scheduler overrides through DIAMETER Gx can only be performed using APN-Aggregate-Max-Bitrate-UL and APN-Aggregate-Max-Bitrate-DL AVPs and requires the following 3gpp-qos-mapping in the DIAMETER Gx Application policy

           >config>subscr-mgmt>diam-appl-plcy>gx>
                   3gpp-qos-mapping
                        apn-ambr-dl scheduler <scheduler-name>
                        apn-ambr-ul scheduler <scheduler-name>
                    exit
  

The operational value of some of the QoS parameters can be derived from different sources.

For queue and policer QoS parameters, the following hierarchy applies (highest priority is listed first):

• Credit Control overrides

• Subscriber Services QoS overrides

• Subscriber QoS overrides (RADIUS, DIAMETER)

• Overrides configured at sla-profile level

• Queue parameters set in QoS policy level

For scheduler and arbiter overrides, the following hierarchy applies:

• ANCP overrides

• Subscriber Services QoS overrides

• Subscriber QoS overrides (RADIUS, DIAMETER)

• Overrides configured at sub-profile level

• Scheduler/arbiter parameters as configured in scheduling/policer-control-policy

Up to 18 QoS overrides can be installed per subscriber host or session. A new set of QoS overrides received using a mid-session change replaces the previous set of QoS overrides.

QoS overrides are always stored as part of the subscriber host or session data but are only applied when the override is valid in the active QoS configuration. For example:

An egress queue 5 PIR rate override is stored with the subscriber session but not applied when the sap-egress QoS policy has no queue 5 defined

RADIUS or DIAMETER Gx initiated QoS overrides can be displayed with the following show commands:

• show service id service-id | name ipoe session detail

• show service id service-id | name ppp session detail

• show service id service-id | name dhcp lease-state detail

• show service id service-id | name dhcp6 lease-state detail

• show service id service-id | name arp-host detail

• show service id service-id | name slaac-host detail

Subscriber services initiated QoS overrides can be displayed with:

show service sub-services

The active QoS overrides per-subscriber and per-SLA Profile Instance can be displayed with:

show service active-subscribers detail

The number of allocated and free Subscriber SLA Profile Instance QoS overrides, QoS Intermediate Arbiter Overrides and QoS User Scheduler Overrides per-line card can be monitored with the tools dump resource-usage card CLI command.

Subscriber QoS overrides are synchronized through MCS in a dual-homing environment. QoS overrides are not stored in the subscriber-mgmt application persistence file.