Secure Link Aggregation Authentication Mechanism
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Solution Overview
Problem
Existing link aggregation methods lack effective security measures to authenticate peer devices before allowing them to become active within a link aggregation group, potentially leading to network vulnerabilities and disruptions in traffic.
Innovation Solution
A network device discovers and authenticates peer devices using protocols like LLDP and DTLS, establishing a secure session while allowing some traffic to continue, and aggregates links only after successful authentication, using challenge-response mechanisms to ensure trust and encryption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If link aggregation is implemented without authentication, then network throughput and redundancy are improved, but network security deteriorates due to potential unauthorized device接入
Solution Approach 1:
The patent implements authentication mechanisms (LLDP for device discovery, DTLS for cryptographic verification, and challenge-response protocols) that execute before link aggregation is activated. This preliminary authentication ensures that only verified devices can join the aggregation group, resolving the security vulnerability while maintaining throughput benefits
2Reliability
If authentication is performed before link aggregation, then network security is improved, but network traffic disruption increases during the authentication process
Solution Approach 1:
The patent maintains network traffic flow continuity during authentication by implementing parallel processing: authentication protocols (LLDP/DTLS) execute while maintaining existing link operations. The system continues to forward traffic through existing paths while verification proceeds, minimizing disruption and maintaining useful network action throughout the security verification process
3Reliability
If multiple authentication protocols are implemented, then authentication reliability is improved, but device complexity increases
Solution Approach 1:
The patent divides the authentication process into distinct functional segments: LLDP for device discovery and basic identification, DTLS for cryptographic key exchange and certificate verification, and challenge-response protocols for final validation. This segmentation allows each protocol to perform its specific function efficiently while maintaining overall system manageability and reliability
Data Source
AI summary
Systems and methods are for securing link aggregation are provided. According to an embodiment, a network device in a secure domain discovers device information associated with a peer network device in an untrusted domain that is connected through a first link directly connecting a first interface of the network device to a first interface of the peer network device, and authenticates the peer while allowing at least some network traffic to continue to be transmitted through the first interface. The network device establishes a secure session between the network device and the peer over the first link when the peer network device is successfully authenticated. The network device then allows the first link to operate as part of a single aggregated logical link, including a second link coupling a second interface of the network device to a second interface of the peer network device.