Packet Redirection Circuit for Network Device Debugging

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Solution Overview

Problem

Network infrastructure devices face challenges in identifying and debugging issues, such as excessive packet drops and processing errors, due to the difficulty in viewing the activity within these devices, which can be exacerbated by modifying configurations that may mask or introduce new problems.

Innovation Solution

Incorporating a packet redirection circuit that can modify forwarding decisions made by the network infrastructure device, allowing for redirection of packets with specific decision types to a local processor for analysis without disrupting normal packet processing, enabling debugging and issue identification without interfering with network flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Difficulty of detecting and measuring

If packet processing configurations are modified to debug network devices, then debugging capability is improved, but normal packet processing may be disrupted or new problems may be introduced

Engineering Contradiction:

Improvedebugging capabilityVSAvoidnormal packet processing

Core Design Contradiction:

Difficulty of detecting and measuringVSReliability

Solution Approach 1:

The system segments packet processing into two distinct paths: a normal forwarding path for regular packet processing, and a debugging path for analysis. The redirection circuit selectively diverts packets based on decision type, allowing debugging operations without interfering with normal packet flow. This segmentation enables independent optimization of each path without mutual interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A redirection circuit acts as an intermediary component between the packet processing pipeline and the debugging system. This intermediary selectively redirects packets based on their decision type (e.g., forwarded, dropped, modified) to a debugging interface, enabling observation and analysis without requiring direct modification of the core packet processing configurations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of information

If all packets are monitored for debugging, then complete visibility is achieved, but processing overhead and performance degradation occur

Engineering Contradiction:

Improvepacket activity visibilityVSAvoidpacket processing throughput

Core Design Contradiction:

Loss of informationVSProductivity

Solution Approach 1:

Instead of monitoring all packets, the system applies partial action by selectively redirecting only those packets that are relevant for debugging purposes. The redirection circuit identifies packets with specific decision types (forwarded, dropped, modified) and redirects only these packets to the debugging interface, reducing the burden on the debugging system while maintaining visibility into critical packet processing events.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system applies different quality levels of monitoring to different packets based on their decision type. Critical packets (those that were forwarded, dropped, or modified) receive enhanced attention through redirection to the debugging interface, while normal packets continue through the standard processing path without additional overhead. This local quality approach optimizes the balance between visibility and performance.

Inventive Principle:

Principle #3Local quality

3Difficulty of detecting and measuring

If debugging interfaces are added to network devices, then troubleshooting capability is improved, but device complexity increases

Engineering Contradiction:

Improvetroubleshooting capabilityVSAvoiddevice structure

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The debugging functionality is extracted as a separate, modular component (redirection circuit) that operates independently from the core packet processing pipeline. This extracted debugging interface can be selectively activated and configured without affecting the fundamental device architecture, allowing enhanced troubleshooting capability while minimizing increases in overall device complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10630596B1Forwarding action redirection

Publication Date: 2020.04.21 AMAZON TECH INC

AI summary

Provided are systems and methods for modifying a forwarding decision for a packet being processed by a network device. The forwarding decision can include a final determination whether to forward the packet from the network device and onto a network. In various implementations, an integrated circuit device of the network device can receive packet information for the packet, where the packet information includes a forwarding decision. The forwarding decision can include a decision type. The integrated circuit device can further determine a redirection includes using the decision type. The redirection information can include a redirection entry for each of one or more decision types. The integrated circuit device can further modify the packet information using values from the particular redirection entry, excluding modification of values associated with an outbound packet header that can be used to forward the particular packet.