Network Node Controller Latency Optimization via In-Band Telemetry
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Solution Overview
Problem
Existing network solutions fail to effectively address congestion in egress port queues of network nodes, leading to latency issues, as they lack real-time monitoring and adaptive rerouting capabilities.
Innovation Solution
A network node with a controller that determines congestion levels in egress port queues through telemetry packets and reroutes data flows to alternative queues based on congestion thresholds, using Differentiated Services Code Point (DSCP) fields in packet headers to manage priority levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional networking equipment is used without real-time monitoring, then device complexity is reduced, but network latency increases due to undetected queue congestion
Solution Approach 1:
The patent implements feedback by having network nodes continuously monitor queue congestion levels and send telemetry data back to a centralized controller. The controller processes this feedback and dynamically adjusts data flow routing decisions, creating a closed-loop system that reduces latency through real-time congestion detection and response
Solution Approach 2:
The patent introduces a centralized controller as an intermediary between network nodes and the routing decision-making process. This intermediary collects telemetry data from multiple nodes, processes congestion information centrally, and coordinates rerouting decisions across the network, enabling complex latency optimization without increasing complexity at individual node levels
2Adaptability or versatility
If data flows are statically routed through fixed queues, then device complexity is minimized, but network adaptability decreases when congestion occurs
Solution Approach 1:
The patent applies dynamics by transitioning from static queue routing to dynamic queue selection. Network nodes continuously monitor congestion levels and adaptively reroute data flows between different queues based on real-time conditions. The system dynamically adjusts routing decisions without requiring complex manual configuration or hardware changes
Solution Approach 2:
The patent changes routing parameters dynamically by modifying which queue is selected for data flow based on congestion thresholds. When congestion is detected in one queue, the system changes the routing parameter to direct traffic through alternative queues, enabling adaptability through parameter adjustment rather than structural complexity
3Measurement precision
If congestion is not monitored in real-time, then measurement precision is reduced, but loss of time increases due to delayed congestion detection
Solution Approach 1:
The patent implements preliminary action by continuously monitoring queue congestion levels before they reach critical thresholds. The system proactively detects congestion conditions and triggers rerouting decisions in advance, preventing severe latency issues rather than reacting after problems occur
Solution Approach 2:
The patent uses feedback mechanisms where network nodes continuously report queue status to the centralized controller, enabling precise real-time measurement of congestion levels. This feedback loop ensures accurate detection and immediate response to congestion conditions, minimizing both detection time and latency impact
Data Source
AI summary
An apparatus for reporting node congestion of a queue of an egress port and changing to a different queue is disclosed. The apparatus includes a network node that includes a controller. The controller is configured to determine a level of congestion of a designated queue of an egress port of the network node in a communication pathway between a sending host sending data packets to a receiving host in response to receiving a telemetry packet seeking telemetry data for packets being transmitted between the sending host and the receiving host. The designated queue is designated for queuing data packets for the egress port. The controller is configured to add the level of congestion to the telemetry packet in response to determining that the level of congestion indicates that the designated queue is congested and to transmit the telemetry packet to a next destination on the communication pathway.