Accelerated NIC Load Balancing for Overlay Encapsulated Traffic
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing load balancing methods for network traffic in data centers are ineffective for overlay-encapsulated traffic, as they rely on visible packet headers which are obscured by encapsulation, limiting the scalability of virtualization platforms and impairing performance.
Innovation Solution
Implementing a system with accelerated Network Interface Cards (NICs) that hash packet contents, select uplinks based on hash values, and encapsulate packets with the selected NIC's MAC address in the outer header, enabling effective load balancing of overlay-encapsulated traffic without requiring switch configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional load balancing methods are used for network traffic, then load balancing works for standard packets with visible headers, but load balancing fails for overlay-encapsulated traffic because the original packet headers are obscured by encapsulation
Solution Approach 1:
The patent introduces an intermediary mechanism (hashing algorithm) that operates on the encapsulated overlay packets to extract load balancing information. Instead of relying on the original inner packet headers which are obscured, the system applies a hashing function to the outer encapsulated packet headers to generate hash values that determine uplink selection. This intermediary approach enables load balancing to function effectively with overlay-encapsulated traffic while maintaining compatibility with the encapsulation mechanism.
2Adaptability or versatility
If the number of overlay networks increases to expand virtualization capabilities, then network virtualization scalability improves, but the virtualization platform's processing load increases beyond its capabilities
Solution Approach 1:
The patent extracts the load balancing decision-making process from the virtualization platform's main processing path. By implementing hashing-based uplink selection at the network interface level (rather than requiring full platform processing), the system removes the computational burden of load balancing decisions from the virtualization platform. This extraction enables the platform to scale to more overlay networks without proportionally increasing processing requirements.
3Productivity
If server-side NICs are teamed with static binding or port channels for load balancing, then load balancing is achieved for standard traffic, but configuration complexity increases and effectiveness is lost for overlay traffic
Solution Approach 1:
The patent implements a self-service load balancing mechanism where the network interface cards automatically perform hashing-based uplink selection without requiring external configuration. The system uses the inherent properties of the overlay packet headers and applies hashing algorithms autonomously to determine uplink assignment. This eliminates the need for complex static binding configurations or port channel setups on both switches and servers, reducing configuration complexity while maintaining load balancing effectiveness for overlay traffic.
Data Source
AI summary
A system includes a server including: logic adapted for receiving traffic from a virtual machine (VM), the traffic including at least one packet, logic adapted for hashing at least a portion of the at least one packet according to a hashing algorithm to obtain a hash value, and logic adapted for selecting an uplink based on the hash value; at least one accelerated network interface card (NIC), each accelerated NIC including: network ports including multiple Peripheral Component Interconnect express (PCIe) ports adapted for communicating with the server and a network, each network port including an uplink, logic adapted for encapsulating the at least one packet into an overlay-encapsulated packet, logic adapted for storing a media access control (MAC) address corresponding to the selected uplink as a source MAC (SMAC) address in an outer header of the overlay-encapsulated packet, and logic adapted for sending the overlay-encapsulated packet via the selected uplink.