Auto-Negotiation Unique Identifier Exchange for LLDP Integrity
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Solution Overview
Problem
Conventional network management systems face issues with unintentional forwarding of Link Layer Discovery Protocol (LLDP) frames due to 'leaky' bridges and undetected repeaters, causing configuration confusion and ambiguity in network topology, primarily due to group addresses that violate the constraint of LLDP frame propagation within a single link.
Innovation Solution
Implementing a unique identifier exchange during the auto-negotiation process between physical layer devices, using auto-negotiation next page messages to ensure each network device can identify its counterpart, thereby preventing unintended forwarding of LLDP frames by confirming the identity of neighboring devices and detecting invisible midpoints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LLDP frames are used for network device identification, then network management capability is improved, but unintentional forwarding by leaky bridges causes configuration confusion and loss of network management integrity
Solution Approach 1:
The patent applies preliminary action by exchanging unique identifiers during the auto-negotiation phase before LLDP frames are transmitted. This early exchange establishes a trusted relationship between directly connected devices, creating a foundation for verifying subsequent LLDP frame authenticity and preventing unintentional forwarding by leaky bridges
Solution Approach 2:
The patent implements feedback mechanisms where devices verify unique identifiers exchanged during auto-negotiation against identifiers received in LLDP frames. This verification process provides continuous feedback to detect and prevent unintentional forwarding, ensuring network management integrity is maintained through ongoing validation
2Adaptability or versatility
If group addresses are used for LLDP frame propagation, then network-wide discovery is enabled, but ambiguity in destination field violates the constraint of single-link propagation
Solution Approach 1:
The patent applies segmentation by dividing network discovery into two distinct phases: auto-negotiation phase for establishing direct device identities through unique identifier exchange, and LLDP phase for capability advertisement. This segmentation ensures that topology information remains unambiguous by separating direct link identification from general capability propagation
Solution Approach 2:
The unique identifier exchanged during auto-negotiation serves as an intermediary that bridges the gap between physical layer connection verification and data link layer LLDP operations. This intermediary enables devices to confirm direct connectivity before processing LLDP frames, eliminating ambiguity about frame origin and destination
Data Source
AI summary
A system and method for unique identifier exchange during auto-negotiation. Wired networks can include non-conformant bridges and/or repeaters that can erroneously forward link protocol frames such as LLDP. These present a problem for higher layer protocols that attempt to manage properties of the link. The unique identifiers exchanged during auto-negotiation can be passed up to higher layers for an integrity check of unique identifiers exchanged using higher layer protocols.