OAM Probing for Shared Mesh Protection Connections
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Solution Overview
Problem
In Shared Mesh Protection networks, there is no standard method for detecting the liveliness and synchronizing the control plane and data plane on protecting connections, leading to potential misdirection of user traffic and difficulties in detecting connection failures, commonly known as the 'black hole' problem.
Innovation Solution
A system and method are introduced to support Operation, Administration, and Maintenance (OAM) on protecting connections by probing these connections using LSP-ping messages over in-band control channels for diagnostics and synchronization, ensuring that the control plane and data plane are aligned, even when protecting connections are not active or are passing user traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If protecting connections are established without OAM probing and synchronization mechanisms, then network resource utilization is improved and device complexity is reduced, but connection failure detection capability deteriorates and traffic misdirection risk increases
Solution Approach 1:
The patent applies universality by making the LSP-ping mechanism and in-band control channel serve multiple functions: they simultaneously perform diagnostics on unactivated protecting connections, synchronize control plane and data plane on activated connections, and provide general OAM capabilities. This multi-functional approach enables comprehensive connection monitoring without requiring separate dedicated mechanisms for each function, thus improving reliability while controlling complexity.
Solution Approach 2:
The patent introduces LSP-ping messages as an intermediary diagnostic tool that can probe protecting connections without activating them or interfering with user traffic. These messages act as mediators between the control plane and data plane, enabling synchronization and failure detection through indirect probing rather than direct intervention, which maintains network operation while providing monitoring capabilities.
2Reliability
If LSP-ping probing is performed on protecting connections, then connection failure detection capability is improved and control-data plane synchronization is achieved, but device complexity and operational overhead increase
Solution Approach 1:
The LSP-ping mechanism is designed to serve multiple OAM functions simultaneously: it can probe unactivated protecting connections for diagnostics, synchronize control plane and data plane on activated connections, and provide general connectivity verification. This multi-functionality reduces the need for separate dedicated mechanisms, thereby improving reliability while controlling the increase in device complexity.
Solution Approach 2:
The in-band control channels provide self-service by carrying both user traffic and OAM probing messages through the same infrastructure. The protecting connections themselves serve as the medium for their own diagnostics and synchronization, eliminating the need for separate out-of-band management channels and reducing overall system complexity despite enhanced monitoring capabilities.
3Adaptability or versatility
If in-band control channels are used for LSP-ping messages, then OAM functionality is improved and separate management infrastructure is eliminated, but interference with user traffic and control messages may occur
Solution Approach 1:
The patent applies segmentation by dividing the in-band control channel into distinct logical segments or time slots for different message types. LSP-ping probing messages, user traffic, and control plane messages are segmented into separate transmission opportunities or logical channels within the same physical infrastructure, allowing OAM functionality to be implemented without causing interference to user traffic or critical control messages.
Solution Approach 2:
The LSP-ping probing messages are transmitted periodically rather than continuously, allowing user traffic and control messages to pass through during intervals between probes. This periodic action enables OAM functionality to be implemented in the in-band channel without causing sustained interference, as the probing occurs at discrete, controlled intervals that do not continuously occupy the channel.
Data Source
AI summary
A method for detecting the liveliness and synchronizing the control-plane and data-plane on protecting connections in a shared mesh network environment through methods for probing the protecting connection conditions by sending in-band messages; and synchronization of control plane and data plane by using LSP-ping messages on the protecting connections.