Redundancy mechanisms for classical internet protocol over asynchronous transfer mode networks
First Claim
1. An asynchronous transfer mode (ATM) communications network with redundant address resolution protocol (ARP) servers, comprising:
- a primary ARP server and a backup ARP server, wherein both the primary and backup ARP servers are connected to the ATM communications network and wherein the primary and backup ARP servers have associated ATM addresses;
a logical internet protocol subnet (LIS), wherein the LIS is connected to the ATM communications network, and wherein an active ARP server resolves internet protocol (IP) addresses to ATM addresses for the LIS;
the primary and backup ARP servers being operable in a first switchover mode of operation, whereinthe backup ARP server recognizes a removal of a redundancy virtual channel connection (VCC) between the backup ARP server and the primary ARP server; and
the backup ARP server registers using the ATM address associated with the primary ARP server, wherein the backup ARP server takes over for the primary ARP server to become the active ARP server.
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Accused Products
Abstract
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.
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Citations
20 Claims
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1. An asynchronous transfer mode (ATM) communications network with redundant address resolution protocol (ARP) servers, comprising:
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a primary ARP server and a backup ARP server, wherein both the primary and backup ARP servers are connected to the ATM communications network and wherein the primary and backup ARP servers have associated ATM addresses; a logical internet protocol subnet (LIS), wherein the LIS is connected to the ATM communications network, and wherein an active ARP server resolves internet protocol (IP) addresses to ATM addresses for the LIS; the primary and backup ARP servers being operable in a first switchover mode of operation, wherein the backup ARP server recognizes a removal of a redundancy virtual channel connection (VCC) between the backup ARP server and the primary ARP server; and the backup ARP server registers using the ATM address associated with the primary ARP server, wherein the backup ARP server takes over for the primary ARP server to become the active ARP server. - View Dependent Claims (2, 3, 4, 5)
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6. An asynchronous transfer mode (ATM) communications network with redundant default gateways, comprising:
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a primary default gateway and a backup default gateway, wherein both the primary and backup default gateways are connected to the ATM communications network and wherein ATM addresses are associated with the primary and backup default gateways; a logical internet protocol subnet (LIS), wherein the LIS is connected to the ATM communications network; and an active default gateway for providing routing services for hosts that do not run routing topology protocols; the primary and backup default gateways being operable in a first switchover mode of operation, wherein the backup default gateway recognizes the removal of a redundancy virtual channel connection (VCC) between the backup default gateway and the primary default gateway; and 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, wherein the backup default gateway takes over for the primary default gateway to become the active default gateway. - View Dependent Claims (7, 8, 9, 10)
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11. A method of communicating using an asynchronous transfer mode (ATM) communications network with redundant address resolution protocol (ARP) servers, comprising:
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providing a primary ARP server and a backup ARP server, wherein both the primary and backup ARP servers are connected to the ATM communications network and wherein the primary and backup ARP servers have associated ATM addresses; providing a logical internet protocol subnet (LIS), wherein the LIS is connected to the ATM communications network, and wherein an active ARP server resolves internet protocol (IP) addresses to ATM addresses for the LIS; removing a redundancy virtual channel connection (VCC) between the backup ARP server and the primary ARP server; detecting the removal of the redundancy VCC using the backup ARP server; and registering the ATM address associated with the primary ARP server using the backup ARP server, wherein the backup ARP server takes over for the primary ARP server to become the active ARP server. - View Dependent Claims (12, 13, 14, 15)
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16. An method of communicating using an asynchronous transfer mode (ATM) communications network with redundant default gateways, comprising:
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providing a primary default gateway and a backup default gateway, wherein both the primary and backup default gateways are connected to the ATM communications network and wherein ATM addresses are associated with the primary and backup default gateways; providing a logical internet protocol subnet (LIS), wherein the LIS is connected to the ATM communications network, and an active default gateway which provides routing services for hosts that do not run routing topology protocols; removing a redundancy virtual channel connection (VCC) between the backup default gateway and the primary default gateway; recognizing the removal of the redundancy VCC using the backup default gateway; and registering a mapping between the ATM address associated with the backup default gateway and an IP address of the default gateway, wherein the backup default gateway takes over for the primary default gateway to become the active default gateway. - View Dependent Claims (17, 18, 19, 20)
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Specification