Packet Communication Device Failure Relief via Virtual Interface Modification
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Solution Overview
Problem
In packet communication systems, when a failure occurs in a path between two packet communication devices, the process of setting a backup path leads to increased load on devices, deteriorating packet transfer performance and affecting other devices in the network.
Innovation Solution
A method that involves setting a protection path within a prescribed time by performing path restoration signaling and modifying virtual interfaces, while maintaining the connection with the disconnected device and not reporting the topology modification to other devices, thereby isolating the failure impact to the two affected devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet communication devices perform connection relationship modification process immediately upon detecting failure, then communication restoration is achieved, but device load increases and packet transfer performance deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-establishing protection paths before failures occur. When a failure is detected, the system can immediately switch to the pre-configured protection path without performing complex connection modification processes, thus restoring communication quickly while avoiding increased device load and maintaining packet transfer performance.
2Reliability
If packet communication devices inform adjacent devices of connection relationship modification, then network topology is updated, but the influence of failure spreads to the whole network
Solution Approach 1:
The patent applies local quality by implementing localized failure handling where only the two affected packet communication devices are involved in the protection path switching. The failure impact is contained locally without propagating to the whole network, as the system uses pre-configured protection paths that isolate the failure scope to minimal devices.
3Loss of time
If protection path is set within prescribed time using path restoration signaling, then communication is restored quickly, but signaling overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring protection paths during normal operation. When a failure occurs, the system only needs to activate the pre-configured path using simple signaling, rather than performing complex path computation and setup. This approach achieves quick restoration while minimizing signaling overhead.
Data Source
AI summary
When a failure occurs on a path set between two packet communication devices, a protection path is set and the communication is recovered without having the effect of the path failure on devices other than the two packet communication devices. When a packet communication device detects a failure in a transmission line or a path between the device itself and a correspondent packet communication device to restore the communication, at least one of a topology modification notice pending step, in which the fact that the connection with the correspondent packet communication device being disconnected is not reported to the packet communication devices other than the correspondent packet communication device for a prescribed time, and a path restoration step, in which path setting signaling is performed to trigger cooperation of the path communication device and the correspondent packet communication device to set the protection path within the prescribed time, is executed together with a virtual interface setting modification step in which a virtual interface used for the path disconnected by the failure is set to the protection path.