Active Performance Monitoring Control Channel for Pseudowires
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Solution Overview
Problem
Legacy network systems face challenges in effectively managing and monitoring pseudowires, particularly in integrating with packet-switched networks like IP/MPLS, due to limitations in active performance monitoring across different network layers.
Innovation Solution
Establishing an active performance monitoring (APM) control channel within pseudowires using PE and PS routers, which enables in-band monitoring of network traffic conditions such as throughput, latency, and packet loss by setting up an APM control channel through LDP messages and VCCV logic, allowing for continuous performance evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pseudowire emulation is used to integrate legacy networks with packet-switched networks, then network interoperability is improved, but active performance monitoring capability deteriorates
Solution Approach 1:
The patent introduces an APM control channel as an intermediary mechanism that enables performance monitoring within pseudowires. This control channel carries APM packets separately from data traffic, allowing monitoring functionality to coexist with the pseudowire emulation infrastructure. The control channel acts as a mediator between the legacy network and packet-switched network, providing monitoring capability without disrupting the underlying PWE integration.
Solution Approach 2:
The patent segments the monitoring function from the data transport function by introducing a dedicated APM control channel. This segmentation allows performance monitoring to be implemented independently within the pseudowire infrastructure, enabling continuous monitoring of metrics like throughput, latency, and packet loss without interfering with the primary data traffic flow through the pseudowire.
2Productivity
If in-band monitoring is implemented within pseudowires, then monitoring efficiency is improved, but control channel complexity increases
Solution Approach 1:
The APM control channel is designed to serve multiple functions: it carries monitoring packets for performance measurement, establishes monitoring sessions between network elements, and provides feedback for continuous evaluation. By making the control channel multi-functional, the patent reduces the need for separate dedicated monitoring infrastructure, thereby managing complexity while maintaining monitoring efficiency.
Solution Approach 2:
The patent implements a feedback mechanism where APM packets traverse the pseudowire in one direction and receive responses in the opposite direction. This bidirectional feedback loop enables continuous performance evaluation without requiring complex unidirectional monitoring systems, simplifying the control channel design while maintaining efficient monitoring capability.
Data Source
AI summary
A system may forward to a network device an advertisement label mapping message that requests an establishment of an active performance monitoring (APM) control channel. Further, the system may process a reply label mapping message that is sent from the network device in response. The system may establish the APM control channel and a pseudowire associated with the APM control channel.