Dataplane-Signaled Packet Capture in Segment Routing
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Solution Overview
Problem
In segment routing networks, capturing packets for analysis, security, and troubleshooting is inefficient due to the lack of scalable solutions, particularly with the introduction of high-speed links like 100G and 400G, and existing methods require complex filters or deployment of packet sniffers at multiple points within the network.
Innovation Solution
The method involves data plane signaling of packet capture instructions within the packet header, allowing network nodes to selectively capture packets based on predefined policies, using a stack of segment identifiers that include capture instructions, enabling in-band signaling and packet capture without the need for extensive filtering or sniffer deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional packet capture methods are used in segment routing networks, then packets can be captured for analysis, but the deployment complexity increases due to requiring packet sniffers at multiple points and complex filters
Solution Approach 1:
The patent introduces segment identifiers as intermediary elements embedded in packet headers that act as mediators between the packet flow and capture nodes. These segment identifiers carry capture instructions that automatically direct packets to appropriate capture points without requiring external filter configurations or multiple sniffer deployments, thereby resolving the deployment complexity while maintaining capture reliability
2Loss of information
If packet capture is implemented across high-speed links (100G, 400G), then network visibility is improved, but the scalability of capture solutions deteriorates due to lack of efficient capture mechanisms
Solution Approach 1:
The patent segments the packet header to include dedicated segment identifier fields that carry capture instructions. This segmentation allows the capture mechanism to be integrated directly into the packet structure, enabling scalable deployment across high-speed links by distributing capture functionality throughout the network infrastructure rather than requiring centralized capture points, thus improving both visibility and scalability
3Measurement precision
If complex filters are deployed for packet capture, then specific traffic can be captured, but the operational complexity increases
Solution Approach 1:
The patent implements self-service packet capture by embedding capture instructions directly within the segment identifiers in packet headers. Packets automatically carry their own capture directives, enabling receiving nodes to perform capture actions without external filter configurations or complex operational interventions. This self-service mechanism maintains precise traffic selection while dramatically simplifying operations
Data Source
AI summary
Presented herein are segment-routing methods and systems that facilitate data plane signaling of a packet as a candidate for capture at various network nodes within a segment routing (SR) network. The signaling occurs in-band, via the data plane—that is, a capture or interrogation signal is embedded within the respective packet that carries a user traffic. The signaling is inserted, preferably when the packet is classified, e.g., at the ingress node of the network, to which subsequent network nodes with the SR network are signaled to capture or further inspect the packet for capture.