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Table 2 Summarizes the messages used for formation as well as maintenance of the clusters

From: A new approach to geographic routing for location aided cluster based MANETs

Message Description
HELLO Contains broadcaster's ID, location information, node status, neighbour table, cluster adjacency table and sender's node value
INFO Contains node value
CH_INFO Contains cluster head ID and cluster neighbour table
CH_ACK The new node's HELLO message is acknowledged by cluster head (CH)
JOIN A new node joins as member in the cluster after cluster head (CH) is activated by sending JOIN message
CH_NEWNODE The new node's JOIN is acknowledged by cluster head.
CH_NACK The new node's HELLO is rejected by cluster head
CH_RELIEVE Notifies the members about its intention to resign as cluster head
CH_RACK Present cluster head relieves finally after broadcasting new cluster head ID