Selective Fast-Forwarding Table Establishment for Network Memory
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Solution Overview
Problem
In network devices, the establishment of fast-forwarding tables for all communication packets leads to insufficient memory, affecting performance and potentially causing the device to hang or restart, especially in scenarios with a large number of user terminals.
Innovation Solution
Implement a method to selectively establish fast-forwarding tables based on service priorities, where the network device determines whether to create a fast-forwarding table for a communication packet by assessing the current resource utilization against a target threshold corresponding to the service priority, allowing flexible configuration of priorities and resource utilization thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast-forwarding tables are established for all communication packets, then packet forwarding efficiency is improved, but memory capacity becomes insufficient
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different data streams based on their characteristics. Instead of uniformly establishing fast-forwarding tables for all packets, the system selectively creates tables only for data streams that meet specific criteria (such as having established TCP connections). This selective approach allows the network device to optimize memory usage while maintaining high forwarding efficiency for critical traffic patterns.
2Productivity
If fast-forwarding tables are established for all communication packets, then packet forwarding efficiency is improved, but network device stability deteriorates
Solution Approach 1:
The patent implements dynamics by making the fast-forwarding table establishment process adaptive and conditional. The system dynamically decides whether to establish a fast-forwarding table based on real-time conditions, specifically whether a TCP connection has been established for the data stream. This dynamic approach prevents the network device from entering unstable states caused by excessive table creation, while still enabling efficient forwarding when conditions are appropriate.
3Productivity
If fast-forwarding tables are established for all communication packets, then packet forwarding efficiency is improved, but device operational duration is reduced
Solution Approach 1:
The patent applies parameter changes by modifying the establishment criteria for fast-forwarding tables based on connection state parameters. Instead of establishing tables for all packets regardless of connection status, the system changes the parameter of 'connection establishment status' to determine whether to create a fast-forwarding table. This parameter-based approach ensures that tables are only created when the underlying TCP connection is properly established, preventing device hang and extending operational duration.
Data Source
AI summary
A method and apparatus for establishing a fast-forwarding table are provided. The method comprises: when a communication packet is received, determining, according to matching rules of services set in a packet processing policy, a target service matching the communication packet; if a fast-forwarding table corresponding to the communication packet is not stored locally, obtaining a preset target priority of the target service, and determining a target resource utilization threshold corresponding to the target priority according to a preset correspondence between priorities and resource utilization thresholds; determining whether a current resource utilization is greater than the target resource utilization threshold; and establishing a fast-forwarding table corresponding to the communication packet if the current resource utilization is not greater than the target resource utilization threshold. With this disclosure, the memory pressure of the network device can be reduced, and the network device can be avoided to hang or restart.