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Gx Interface Support
Applying IMS Authorization Service to an APN
After configuring IMS Authorization service at the context-level, an APN must be configured to use the IMS
Authorization service for an IMS subscriber.
Use the following example to apply IMS Authorization service functionality to a previously configured APN within the
context configured in the
configure
context <context_name>
apn <apn_name>
ims-auth-service <imsa_service_name>
active-charging rulebase <rulebase_name>
end
Notes:
<context_name>
<imsa_service_name>
in the context.
For Rel. 7 Gx, the ECS rulebase must be configured in the APN.
ECS allows change of rulebase via Gx for PCEF binding scenarios. When the old rulebase goes away, all the
rules that were installed from that rulebase are removed. This may lead to termination of a few bearers (PDP
contexts) if they are left without any rules. If there is a Gx message that changes the rulebase, and also
activates some predefined rules, the rulebase change is made first, and the rules are activated from the new
rulebase. Also, the rulebase applies to the entire call. All PDP contexts (bearers) in one call use the same ECS
rulebase.
For predefined rules configured in the ECS, MBR/GBR of a dynamic/predefined rule is checked before it is used
for PCEF binding. All rules (dynamic as well as predefined) have to have an MBR associated with them and all
rules with GBR QCI should have GBR also configured. So for predefined rules, one needs to configure
appropriate peak-data-rate, committed-data-rate as per the QCI being GBR QCI or non-GBR QCI. For more
information, in the ACS Charging Action Configuration Mode, see the
command.
Provided interpretation of the Gx rulebase is chosen to be ECS group-of-ruledefs, in the Active Charging Service
Configuration Mode configure the following command:
policy-control charging-rule-base-name active-charging-group-of-ruledefs
Verifying Subscriber Configuration
Verify the IMS Authorization service configuration for subscriber(s) by entering the following command:
show subscribers ims-auth-service <imsa_service_name>
<imsa_service_name>
Configuring Rel. 7 Gx Interface
must be the name of the context in which the IMS Authorization service was configured.
must be the name of the IMS Authorization service configured for IMS authentication
must be the name of the IMS Authorization service configured for IMS authentication.
section.
flow limit-for-bandwidth
Cisco ASR 5x00 Packet Data Network Gateway Administration Guide ▄
Rel. 7 Gx Interface ▀
CLI
301
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