Cisco ASR 5000 Administration Manual page 116

▀ Features and Terminology
 If default quota is configured and default quota is not exhausted before OCS responds with quota, trafic is
passed. Initial default quota used is counted against initial quota allocated. If quota allocated is less than the
actual usage then actual usage is reported and additional quota requested. If no additional quota is available
then traffic is denied.
 If default quota is not exhausted before OCS responds with denial of quota, gateway blocks traffic after OCS
response. Gateway will report usage on default quota even in this case in CCR-U (FINAL) or CCR-T.
 if default quota is consumed before OCS responds, if OCS is not declared dead (see definition in use case 1
above) then traffic is blocked until OCS responds.
Thresholds
The Gy client supports the following threshold types:
 Volume-Quota-Threshold
 Time-Quota-Threshold
 Units-Quota-Threshold
A threshold is always associated with a particular quota and a particular quota type. in the Multiple-Services-Credit-
Control AVP, the Time-Quota-Threshold, Volume-Quota-Threshold, and Unit-Quota-Threshold are optional AVPs.
They are expressed as unsigned numbers and the units are seconds for time quota, octets for volume quota and units for
service specific quota. Once the quota has reached its threshold, a request for more quotas is triggered toward the server.
User traffic is still allowed to flow. There is no disruption of traffic as the user still has valid quota.
The Gy sends a CCR Update with a Multiple-Services-Credit-Control AVP containing usage reported in one or more
User-Service-Unit AVPs, the Reporting-Reason set to THRESHOLD and the Requested-Service-Unit AVP without
data.
When quota of more than one type has been assigned to a category, each with its own threshold, then the threshold is
considered to be reached once one of the unit types has reached its threshold even if the other unit type has not been
consumed.
When reporting volume quota, the DCCA always reports uplink and downlink separately using the CC-Input-Octets
AVP and the CC-Output-Octets AVP, respectively.
On receipt of more quotas in the CCA the Gy discard any quota not yet consumed since sending the CCR. Thus the
amount of quota now available for consumption is the new amount received less any quota that may have been
consumed since last sending the CCR.
Conditions for Reauthorization of Quota
Quota is re-authorized/requested from the server in case of the following scenarios:
 Threshold is hit
 Quota is exhausted
 Validity time expiry
 Rating condition change:
 Cellid change: Applicable only to GGSN and P-GW implementations.
 LAC change: Applicable only to GGSN and P-GW implementations.
 QoS change
 RAT change
▄ Cisco ASR 5000 IP Services Gateway Administration Guide
116
Gy Interface Support
OL-27210-02