The node initiating the Gx session (sending the CCR-I message) with support for extended bandwidth AVPs is not aware of whether the peering node supports extended bandwidth AVPs at the session initiation time. The extended-BW-NR feature flag is negotiated from both sides during session negotiation.
For this reason, if the bandwidth information carrying AVPs needs to be transmitted in the CCR-I message during session initiation and the bandwidth value is greater than 232 - 1, both AVPs, non-extended and extended, must be transmitted.
The non-extended bandwidth AVP is set to the value of 232 - 1 (maximum value).
The extended bandwidth AVP is set to the real bandwidth value.
If the receiving node supports extended AVPs, it processes the received extended bandwidth AVP with the real value; otherwise it processes the non-extended bandwidth AVP with the maximum value.
In SR OS, only APN-related bandwidth AVPs are transmitted during session negotiation and, therefore, their processing should adhere to the above described behavior.