| 摘要 |
The invention relates to a method for preventing circular routing in a telecommunication network, particularly in a common channel signalling network. In the method the availability of a particular route is notified by sending particular management messages from a node to another (A through D). In this case, e.g. a node acting as a signal transfer point, sends to its adjacent nodes particular transfer-prohibited messages (TFP) notifying said adjacent nodes that they must no longer route messages destined to the nodes mentioned in the TFP messages via said node that sent the TFP messages. In order to prevent circular routing without unnecessarily making nodes inaccessible, (a) transfer-prohibited messages (TFPp) used only for preventing circular routing are made distinguishable from said transfer-prohibited messages (TFP), (b) when receiving a preventive transfer-prohibited message (TFPp) relating to a particular destination node, a node sends a corresponding message to the adjacent nodes via which it routes messages to said destination node, and (c) each node stores route-specific information on the type of the last transfer-prohibited message (TFP or TFPp) received. |
