Point-to-Point Network Redundancy for Link Failure Detection
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Solution Overview
Problem
High-speed computing networks face data loss due to link failures, as standard Ethernet protection methods like G.8031 do not provide end-to-end protection, leading to packet drops and disrupted traffic flows.
Innovation Solution
Implementing a dual homing network configuration with point-to-point redundancy, using IEEE 802.1ag continuity check messages to detect primary link failures and coordinate failover to backup links, leveraging G.8031 MPLS PWE redundancy for seamless switchover and recovery between Ethernet and MPLS networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard Ethernet protection (G.8031) is used, then local link failure protection is provided, but end-to-end protection is not achieved leading to packet loss
Solution Approach 1:
The patent segments the protection mechanism into two coordinated parts: G.8031 at the Ethernet access switch for local link protection, and IEEE 802.1ag continuity check messages at the MPLS router for end-to-end path monitoring. This segmentation allows each protocol to operate at its appropriate layer while working together to achieve complete end-to-end protection, preventing packet loss that occurs with G.8031 alone.
Solution Approach 2:
The patent introduces IEEE 802.1ag continuity check (CC) messages as an intermediary mechanism between the Ethernet access switch and MPLS router. These CC messages traverse the MPLS network to detect end-to-end link failures, acting as a mediator that bridges the protection gap between G.8031's local protection and the need for remote end-to-end protection, thereby preventing packet loss.
2Reliability
If point-to-point redundancy with coordinated failover is implemented, then network reliability is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by making both the Ethernet access switch and MPLS router capable of processing and generating IEEE 802.1ag continuity check messages. This multi-functionality allows the same protection mechanism to operate bidirectionally at both ends of the connection, simplifying the overall system architecture compared to asymmetric solutions, while achieving high network reliability through coordinated failover.
Solution Approach 2:
The patent implements feedback through periodic exchange of IEEE 802.1ag continuity check messages between the access switch and router. Each device monitors received CC messages and automatically triggers failover to backup links when messages are lost, providing continuous feedback about link health. This automated feedback mechanism improves reliability while reducing the need for complex manual configuration and monitoring.
Data Source
AI summary
A network configuration having multiple network elements and routers using point-to-point network redundancy to improve network reliability and performance is disclosed. A process using point-to-point network redundancy is able to detect a first checking message (“CM”) formatted in a connectivity verification protocol (“CVP”) such as IEEE 802.1ag indicating a primary link failure. The primary link is a connection between a first network element (“NE”) situated in a first network such as Ethernet based LAN network and a second NE situated in a second network such as an IP based MPLS network. Upon sending a second CM indicating the primary link failure to the second NE, a coordinated failover from the primary link to the backup link at both first and second NEs is performed.