2.6.15 Congestion Control

The DSR supports local and remote congestion control via the use of congestion levels. Congestion levels are defined for which only a percentage of Request messages are processed during the congestion period. The DSR supports a method for limiting the volume of Diameter Request traffic that DSR is willing to receive from DSR peers. In addition, the DSR provides a method for partitioning the MPS capacity among DSR peer connections, providing some user-configurable prioritization of DSR traffic handling. Congestion levels correspond to minor, major and critical alarms associated with resource utilization. The percentage of Request messages to be processed for each level is shown below. The DSR may return a user configurable Answer message when a Request message is not successfully routed during congestion. Under severe congestion conditions, the DSR may not return an Answer message. Request messages that are not processed will be discarded. An OAM event will be raised upon entering and exiting congestion levels. If the Next Generation Network Priority Service (NGN-PS) feature is enabled, these DSR Congestion Control mechanisms do not affect processing of NGN-PS messages. Refer to Next Generation Network Priority Service (NGN-PS) for more information.

Figure 2-17 Congestion Control