Abstract: The invention relates to a method for address resolution in a communication system. Each node is configured with a management node physical address. A node assuming the role of a management node transmits a known management node physical address to a via a network segment. The management node physical address is associated with the network segment in the switch. Address resolution queries are unicasted from other nodes to the switch using the management node physical address. The switch relays the queries to the network segment of the management node. From the queries the management node records logical address and physical address pairs pertaining to other nodes.

Abstract: In a method and system for recovering a faulty unit, a predetermined number of recovery periods, and the maximum number of times a recovery act is carried out during a recovery period, are defined. A faulty unit is taken out of operation, recovered (i.e. subjected to a procedure designed for remediating the fault, if possible), and brought back into operation if tests indicate that the unit is in condition (i.e., is not faulty). The recovered unit is monitored for the time of succeeding recovery periods and is re-recovered, if necessary, provided that the number of the recovery acts carried out during each recovery period does not exceed the maximum number predetermined for the respective period. As a result, bouncing of the unit back and forth in an uncontrolled manner, if the fault is of such a type that the recovery system cannot detect it on the basis of the tests carried out, is reduced and eventually curtailed.