First Hop Router Host Status Detection via Proactive Timer
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Solution Overview
Problem
Conventional methods for detecting host status and migration in communication networks, such as those using ARP/ping, face limitations including high CPU resource consumption, slow detection times, and inability to detect multicast and broadcast traffic, especially in virtualized environments.
Innovation Solution
A proactive approach involving a first hop router that maintains a status table for active hosts, using a probe mechanism to check host aliveness only when necessary, and updating the status based on response messages, allowing for efficient detection of host migration and status changes without relying on ARP messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ARP/ping methods are used for host status detection, then host status can be detected, but CPU resource consumption is high and detection time is slow
Solution Approach 1:
The system performs preliminary actions by setting host status to active and starting timers when packets are received, proactively preparing for potential host failures before they occur. This allows the system to have detection mechanisms already in place rather than reacting slowly when failures occur
Solution Approach 2:
The system uses periodic probe messages sent at intervals determined by timers to check host status. This periodic action provides regular status updates without continuous monitoring, reducing CPU consumption while maintaining detection reliability
2Reliability
If conventional ARP/ping methods are used for host status detection, then host status can be detected, but detection time is slow
Solution Approach 1:
The system proactively sets status and starts timers when packets are received, preparing detection mechanisms in advance. This preliminary action enables faster detection response compared to conventional reactive methods
Solution Approach 2:
The system uses feedback from probe message responses to update host status in real-time. When probe messages receive responses, the system immediately updates status and resets timers, providing rapid feedback loops that reduce overall detection time
3Reliability
If conventional ARP/ping methods are used for host status detection, then host status can be detected, but detection is limited by traffic type
Solution Approach 1:
The system uses a universal packet reception mechanism that works across all traffic types including unicast, multicast, and broadcast traffic. The first hop router monitors all packets regardless of type, making the detection system adaptable to diverse network traffic without requiring traffic-specific detection methods
Data Source
AI summary
In one embodiment, a method includes receiving a packet from a host at a first hop router in a network site, the first hop router in communication with a core network and operable to encapsulate packets received from the host for transmission to a remote network site, setting a status for the host in a table at the first hop router as active, starting a timer for the host at the first hop router, transmitting a probe message from the first hop router to the host if a packet is not received at the first hop router from the host before the timer expires, updating the status of the host at the table based on whether a response message is received from the host, and using the host status to detect host migration. An apparatus and logic are also disclosed herein.