Hash Collision Prevention in Network Forwarding Tables
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Solution Overview
Problem
Hash collisions in hash forwarding tables of networking information handling systems lead to inefficient operations, as they result in the inability to add new IP addresses, requiring software-based forwarding and consuming valuable processing resources, and existing solutions like multiple buckets or ASIC modifications are reactive and disruptive.
Innovation Solution
An Information Handling System (IHS) with a host device address generation engine that retrieves network addressing information, identifies a hashing function, and determines host device addresses that do not produce hash collisions, thereby preventing collisions by provisioning these addresses to host devices, ensuring efficient hardware-based forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hash forwarding table is used for efficient hardware-based forwarding, then forwarding speed and efficiency are improved, but hash collisions occur that prevent new IP addresses from being added and require disruptive reactive solutions
Solution Approach 1:
The patent applies preliminary action by proactively generating IP addresses that are guaranteed to avoid hash collisions before they occur. The address generation engine simulates hash operations using the same hashing function as the forwarding table, and only assigns addresses that produce unique hash values. This prevents hash collisions before they can disrupt forwarding operations, eliminating the need for reactive solutions like software-based forwarding.
Solution Approach 2:
The patent implements feedback by using the actual hashing function from the forwarding table to validate IP addresses before assignment. The address generation engine performs hash operations on candidate addresses, checks for collisions against existing hash values, and only provisions addresses that pass the validation. This feedback loop ensures continuous collision-free operation as the forwarding table fills.
2Reliability
If multiple buckets or ASIC modifications are used to address hash collisions, then collision resolution capability is improved, but device complexity and processing resource consumption increase
Solution Approach 1:
The patent extracts the collision prevention function from the forwarding table structure itself and places it in the address generation phase. Instead of modifying the forwarding table to handle collisions (multiple buckets, ASIC modifications), the solution removes collisions at their source by generating addresses that are guaranteed to produce unique hash values. This simplifies the forwarding table structure while maintaining collision resolution capability.
3Quantity of substance
If the forwarding table approaches capacity, then more IP addresses can be routed, but hash collisions become more likely and operational efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and reserving IP addresses with guaranteed unique hash values before the forwarding table reaches capacity. The address generation engine continuously simulates hash operations and identifies addresses that will not collide with existing entries, allowing the system to maintain high forwarding efficiency even as the table approaches full capacity.
Data Source
AI summary
A hash collision prevention system includes a plurality of host devices and a plurality of networking devices. A host device address generation system retrieves network addressing information associated with the plurality of host devices, and identifies a hashing function utilized by the plurality of networking devices in transmitting data packets associated with the plurality of host devices. The host device address generation system then uses the hashing function and the network addressing information to determine a plurality of host device addresses that do not produce a hash collision, and provides the plurality of host device addresses for provisioning to the plurality of host devices.