ITU-T E.352

Routing policies typically used in ATM- and IP-based networks do not fully consider the possible instabilities and drastic loss of throughput that can occur under congestion. Use of bandwidth reservation and avoidance of long paths are recommended under such congestion, which can lead to more efficient use of network resources. Also, there is an emphasis in ATM- and IP-based networks on the use of state-dependent-routing (SDR) methods. However, the flooding methods typically used by these SDR methods to disseminate network status information can lead to inefficient use of network resources. Use of event-dependent-routing (EDR) methods and/or more efficient dissemination of network status information are recommended as other possible approaches to consider. Finally, QoS routing rules are recommended to ensure service performance quality, such as avoidance of excessive transfer delay by limiting the number of satellite hops in an end-to-end connection.