Network Device Hash Function Selection for ECMP and LAG
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Solution Overview
Problem
Current network devices face challenges in efficiently configuring Equal-Cost Multi-Path (ECMP) and Link Aggregation Group (LAG) routing functionalities, leading to potential network polarization where traffic is concentrated on a few routes instead of being distributed evenly across available paths.
Innovation Solution
The method involves selecting and using specific hash functions for ECMP and LAG processing based on network chip identification, MAC address, and flags, which are determined during the network device's initialization, ensuring unique parameter sets for each device and distributing traffic effectively across multiple routes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single hash function is used for all network devices, then configuration is simple, but network polarization occurs and traffic is not distributed evenly
Solution Approach 1:
The patent applies local quality by making each network device use a unique hash function selected based on its own identification (device ID, MAC address, or chip ID). This ensures that while the overall system has diverse routing behaviors, each individual device's configuration remains simple and automatic, resolving the contradiction between configuration simplicity and traffic distribution efficiency
Solution Approach 2:
The patent changes the parameter of hash function selection by introducing device-specific identification parameters (device ID, MAC address, chip ID) to determine which hash function each device uses. This parameter change enables automatic differentiation between devices while maintaining simple configuration procedures, thereby improving traffic distribution without complicating deployment
2Manufacturing precision
If manual configuration of routing parameters is required, then routing decisions can be precisely controlled, but device complexity and configuration time increase
Solution Approach 1:
The patent implements self-service by enabling network devices to automatically select their own hash functions based on their unique identifiers. The devices self-configure their routing parameters without manual intervention, achieving precise routing control through algorithmic selection rather than manual configuration, thus maintaining routing precision while eliminating configuration complexity
Solution Approach 2:
The patent applies preliminary action by pre-defining multiple hash functions with different characteristics before deployment. During device initialization, the appropriate hash function is automatically selected based on device identification, preparing the routing configuration in advance without requiring manual setup, thereby achieving precise control with minimal operational complexity
Data Source
AI summary
A method for configuring network devices. The method includes selecting a first hash function to use to process packets using Equal-Cost Multi-Path (ECMP) on a network device, where the first hash function is selected from a set of hash functions using a second hash function, a network chip ID of the network chip in the network device, a network device media access control (MAC) address, and an ECMP flag. The method further includes selecting a third hash function to use to process packets using a Link Aggregation Group (LAG), where the third hash function is selected from the set of hash functions using a fourth hash function, the network chip ID of the network chip in the network device, the network device MAC address, and the LAG flag. The method further includes processing a packet received by the network device using the first hash function or the third hash function.