Network Terminal IP Address Storage for Backup Reliability
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Solution Overview
Problem
In conventional network systems using DHCP, IP telephones and terminals cannot maintain a connection to a backup system control device when a malfunction occurs in the transmission line between the DHCP server and the terminal, leading to a loss of usable IP address information and disrupting operation.
Innovation Solution
A network architecture where network terminal devices store and manage their IP addresses, allowing them to re-register with either the primary or backup system control device when a connection malfunction occurs, eliminating the need for a DHCP server at each remote station by using stored IP addresses from a previous address management device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DHCP is used to dynamically provide IP addresses in a remote environment, then IP address management is simplified and centralized, but connection reliability fails when transmission line malfunctions occur
Solution Approach 1:
The terminal device stores the IP address acquired from the DHCP server in advance before any malfunction occurs. This preliminary storage ensures that when a transmission line malfunction happens, the terminal can immediately use the stored IP address to connect to the backup system control device without needing to communicate with the DHCP server, thus resolving the contradiction between centralized management and connection reliability.
2Reliability
If a backup system control device is implemented for fault tolerance, then system reliability improves, but DHCP operation becomes impossible in conventional networks
Solution Approach 1:
The terminal device preliminarily stores the IP address information before any failure occurs. When switching to backup mode, this stored information enables the terminal to maintain DHCP-like operation capability without requiring real-time communication with the DHCP server, thus allowing both backup system operation and DHCP functionality to coexist.
Solution Approach 2:
The stored IP address acts as an intermediary that bridges the terminal device and the backup system control device. This intermediary enables communication and DHCP operation to continue even when the direct connection to the DHCP server is interrupted, resolving the contradiction between backup system implementation and DHCP operation capability.
3Reliability
If IP address time limit updates are performed continuously, then IP address validity is maintained, but connection capability is lost when transmission line malfunctions occur
Solution Approach 1:
The terminal device performs preliminary storage of the IP address before the time limit expires or before any malfunction occurs. This eliminates the need for continuous update operations, as the stored IP address can be used immediately when connection is needed, thus maintaining both IP address validity and connection capability even during transmission line malfunctions.
Data Source
AI summary
When a communication malfunction occurs in the transmission line between routers, and operation is carried out by a backup system control device, IP telephone terminals can connect to the backup system control device through the use of an IP address that is previously acquired from the address management device and saved. When the transmission line has been restored, the IP telephone terminals reconnect to the address management device so that operation can be carried out using an IP address under the control of the address management device. In a system that is operated by DHCP, it is thereby possible to construct a network that can be operated without installing a DHCP server at each remote station.