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190 SS7 MESSAGE TRANSFER PARTFigure 8.8-4. Load sharing for internetwork messages from A to H. (From IEEE Commun. Mag.28(7). Copyright # 1990 IEEE.)8.9 MTP3 SIGNALING NETWORK MANAGEMENTThe purpose of MTP3 signaling network management is to keep the signalingmessage traffic flowing under abnormal (congestion, failure) conditions in the signalingnetwork. Some of these conditions may require a temporary reduction—orsuspension—of outgoing message traffic to certain destinations. In these cases,SNM alerts the level-4 protocols at its signaling point [8,10].8.9.1 Structure and Interfaces of SNMSNM consists of three parts—see Fig. 8.9-1.SNM Link Management. This monitors and controls the status of the individualMTP2s (signaling links) of the signaling point.SNM Route Management. This communicates with its “peer” functions at othersignaling points, sending and receiving information regarding the status of signalingroutes to individual destinations.SNM Traffic Management. This receives information from SNM link managementon the status (available/unavailable) of the signaling links at its signalingpoint, and information from SNM route management about problems on the signalingroute sets to particular destinations. When necessary, it informs SMH messagerouting and the MTP-users at its signaling point.Some SNM procedures involve more than one part of SNM and require communicationsbetween these parts.Interfaces of SNM. SNM has interfaces with the MTP-users (level-4 protocols),the MTP2s of the signaling links, and the SMH message routing function at its