摘要 |
PROBLEM TO BE SOLVED: To avoid a fault without duplexing a line by providing a line state table which can be rewritten in accordance with the fault for ATM switches and connecting the LAN emulation management servers of multiplex structure. SOLUTION: An ATM network is constituted of the ATM switches 101 and 102 and duplexed LAN emulation management servers 301a and 301b are connected to the ATM switch 101. The line state table 304 and a routing table 303 for setting present/preliminary line type items are provided. The ATM switch 101 monitors the LAN emulation management servers 301a and 301b. When a fault detection part detects the occurrence of the fault in the present line #3, the present line #3 and the preliminary line #2 in the routing table 303 are rewritten based on the rewriting of the table 304. Thus, an incoming call to a well-known address is given to the normal preliminary line #2. |