MPLS-TP Failure Localization via OAM Packet Identification
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Solution Overview
Problem
Current MPLS-TP networks face challenges in failure localization due to their requirement to operate independently of IP, as traditional LSP Ping/Traceroute mechanisms rely on IP functionality, rendering them ineffective in IP-less environments.
Innovation Solution
A method for failure localization in MPLS-TP networks involves associating tables with each MEP and MIP, where OAM packets are sent with identifying information to enable identification of subsequent MEPs or MIPs, and reply packets are generated and updated to determine the location of failures by analyzing the identity of MIPs/MEPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional LSP Ping/Traceroute mechanisms are used for failure localization, then failure localization capability is improved, but the system becomes dependent on IP functionality which is not available in MPLS-TP networks
Solution Approach 1:
The patent introduces OAM packets as an intermediary mechanism that operates independently of IP. These packets contain identification information for MEPs and MIPs, allowing failure localization without relying on IP functionality. The OAM packets serve as a mediator between the monitoring system and the MPLS-TP network elements.
Solution Approach 2:
The patent changes the fundamental parameter of packet structure by incorporating identification information of MEPs and MIPs directly into OAM packets. This parameter change enables the packets to carry necessary routing and identification data without requiring IP headers, thus achieving IP independence while maintaining failure localization capability.
2Measurement precision
If OAM packets include identification information of subsequent MEPs or MIPs, then failure localization precision is improved, but packet structure complexity increases
Solution Approach 1:
The patent segments the identification information into distinct fields within the OAM packet structure. Each MEP and MIP identification is separately encoded, allowing receivers to efficiently extract and process only the relevant identification data needed for failure localization, rather than parsing entire packet structures.
Solution Approach 2:
The patent uses simplified copies of identification information in OAM packets rather than complete routing table entries. The packets contain essential identification fields that replicate the necessary routing information in a compact form, reducing packet complexity while maintaining sufficient information for failure localization.
Data Source
AI summary
The present invention relates to methods and arrangements in an MPLS-TP network, comprising a plurality of interconnected routers configured for MPLS-TP, wherein at least a first router is defined as an originating Maintenance End Point, MEP, a second router is defined as a targeting MEP and the third router is defined as a Maintenance Intermediate Point, MIP. The basic idea of the present invention is to associate a table with each MIP and MEP, wherein the tables comprises information related to the MEPs of the MPLS-TP network and the information from the tables is inserted in the reply packets and forwarded packets. By using this information, the OAM packets can find the subsequent MIP or MEP and failure localization may be performed.