Redundancy mechanisms for classical internet protocol over asynchronous transfer mode networks

摘要

A primary ARP server and a backup ARP server are connected to an ATM communications network. The primary and backup ARP servers each have associated ATM addresses. Also, a LIS is connected to the ATM communications network. Either the primary or backup ARP server is the active ARP server and resolves IP addresses to ATM addresses for the LIS. When the backup ARP server recognizes the removal of a redundancy virtual channel connection (VCC) between the backup ARP server and the primary ARP server, the backup ARP server registers using the ATM address associated with the primary ARP server. This allows the backup ARP server to take over for the primary ARP server to become the active ARP server. In addition, a primary default gateway and a backup default gateway are connected to the ATM communications network. These default gateways have associated ATM addresses. One of the primary and backup default gateways is active at a time. The active default gateway provides routing services for hosts that do not run routing topology protocols. When the backup default gateway recognizes the removal of a redundancy virtual channel connection (VCC) between the backup default gateway and the primary default gateway, the backup default gateway registers a mapping between the ATM address associated with the backup default gateway and an IP address of the default gateway. In this manner the backup default gateway takes over for the primary default gateway to become the active default gateway.