rfc9390v3.txt   rfc9390.txt 
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4.1. Session Grouping Capability Discovery 4.1. Session Grouping Capability Discovery
Diameter nodes SHOULD NOT perform group operations with peer nodes Diameter nodes SHOULD NOT perform group operations with peer nodes
unless the node has advertised support for session grouping and group unless the node has advertised support for session grouping and group
operations. operations.
4.1.1. Capability Discovery Based on the Application Id 4.1.1. Capability Discovery Based on the Application Id
Newly defined Diameter applications may intrinsically support Newly defined Diameter applications may intrinsically support
Diameter session grouping and group operations. In such a case, Diameter session grouping and group operations. In these cases,
there is no need of a specific discovery mechanism for the support of there is no need of a specific discovery mechanism for the support of
session grouping capability besides the discovery of the Application session grouping capability besides the discovery of the Application
Id assigned to the application advertised during the capability Id assigned to the application advertised during the capability
exchange phase described in Section 5.3 of [RFC6733]. exchange phase described in Section 5.3 of [RFC6733].
System-specific and deployment-specific means, as well as out-of-band System-specific and deployment-specific means, as well as out-of-band
mechanisms for capability discovery, can be used to announce nodes' mechanisms for capability discovery, can be used to announce nodes'
support for session grouping and session group operations. In such support for session grouping and session group operations. In such
case, the optional Session-Group-Capability-Vector AVP, as described case, the optional Session-Group-Capability-Vector AVP, as described
in Section 4.1.2, can be omitted in Diameter messages being exchanged in Section 4.1.2, can be omitted in Diameter messages being exchanged
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