Tunnel State Detection via Layer-Two Control Packet Analysis
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Solution Overview
Problem
Network element managers face challenges in distinguishing between logical and physical connections, particularly in tunnel configurations where intermediate elements facilitate communication, and in verifying the relay of layer-two control protocols as per desired tunnel configurations.
Innovation Solution
The method involves retrieving neighbor information from network elements using different layer-two control protocols, prioritizing protocols like LLDP, OAM, and LACP, and determining connection types by analyzing IP and MAC addresses, with the element manager or network elements themselves sorting through identification information to differentiate logical and physical neighbors and protocol configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the element manager uses manual configuration for connection information, then the accuracy of network topology is improved, but the ease of operation deteriorates
Solution Approach 1:
The network elements perform self-discovery by automatically generating and exchanging LLDP packets to identify their neighbors. The element manager receives this self-reported information without manual intervention, allowing the system to maintain accurate topology data while eliminating manual configuration requirements.
Solution Approach 2:
The element manager sends LLDP packets through tunnels to test connectivity and receives feedback about which protocols are successfully relayed. This feedback mechanism enables automatic verification of tunnel configurations and identification of logical versus physical connections without manual input.
2Ease of operation
If the element manager attempts to distinguish logical and physical connections automatically, then the ease of operation is improved, but the reliability deteriorates
Solution Approach 1:
LLDP packets serve as intermediaries that carry identification information through the network. By analyzing which LLDP packets successfully reach their destinations and which are blocked by tunnel configurations, the element manager can reliably distinguish logical connections (tunnels) from physical connections with high accuracy.
Solution Approach 2:
The patent replaces manual mechanical configuration processes with automated electronic discovery mechanisms. The element manager uses LLDP protocol exchanges and packet relay testing to automatically identify connection types, substituting human operators with systematic electronic verification procedures that improve both ease of operation and reliability.
3Reliability
If the element manager verifies tunnel protocol configurations, then the reliability is improved, but the productivity deteriorates
Solution Approach 1:
The element manager performs preliminary configuration verification by sending LLDP packets through tunnels before actual network operations begin. This advance testing identifies misconfigurations early, preventing future network issues and reducing the need for time-consuming troubleshooting and reconfiguration later.
Solution Approach 2:
The verification process uses feedback from LLDP packet relay results to automatically determine whether tunnel configurations match desired settings. When misconfigurations are detected, the system can alert operators or attempt automatic correction, significantly reducing the time and effort required for manual verification while maintaining high reliability.
Data Source
AI summary
Element managers and processes retrieve information from a first packet switch. The information is derived from layer-two (data link layer) control packets relayed from a second packet switch to the first packet switch via a tunnel. The layer-two control packets conform to a layer-two control protocol. Based at least in part on the retrieved information, the element managers and processes determine that the tunnel is configured to relay layer-two control packets conforming to the layer-two control protocol despite a desired tunnel configuration specifying that the tunnel should not be configured to relay layer-two control packets conforming to the layer-two control protocol. Element managers and processes may alternatively or additionally detect other discrepancies between the desired tunnel configuration and the tunnel.