Multipoint BFD Sessions for Traffic-Level BIER Fault Detection
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Solution Overview
Problem
Current BIER BFD technology only provides node-level detection, failing to achieve rapid fault detection at the traffic level, leading to prolonged disruption of traffic flows when issues occur in BIER nodes.
Innovation Solution
Implementing a method and apparatus for multipoint BFD sessions in a BIER network by notifying BIER information and BFD information to each BFER, establishing associated sessions with traffic flow information, using protocols like BIER Overlay, BGP, PIM, and HTTP, to enable rapid detection and response to traffic-level failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current node-level BFD detection is used in BIER network, then implementation complexity is reduced, but fault detection precision at traffic level cannot be achieved
Solution Approach 1:
The patent segments the detection scope from node-level to traffic-level by introducing traffic flow information into BFD detection. Each BFD session is associated with specific traffic flow information, enabling precise detection at the traffic level while maintaining manageable complexity through structured session management.
Solution Approach 2:
The patent nests traffic flow information within BFD sessions, which are themselves nested within the BIER network architecture. This layered nesting allows traffic-level detection to be implemented within the existing node-level framework, achieving precision without proportionally increasing overall complexity.
2Measurement precision
If traffic-level BFD detection is implemented, then fault detection precision improves, but convergence speed may be affected due to additional signaling
Solution Approach 1:
The patent merges traffic flow information with BFD session establishment, combining what could be separate processes into a unified operation. When a BFD session is established, traffic flow information is simultaneously associated with it, eliminating the need for separate signaling and maintaining rapid convergence.
Solution Approach 2:
The patent performs preliminary association of traffic flow information with BFD sessions during the session establishment phase. This preliminary action ensures that when faults occur, the detection system already has the necessary traffic context ready, enabling immediate precise detection without additional signaling delays.
3Reliability
If multipoint BFD sessions are established with multiple BFERs, then reliability of traffic detection improves, but device complexity increases
Solution Approach 1:
The patent makes BFD sessions universal by allowing them to serve multiple BFERs simultaneously through multipoint configuration. A single BFD session can be established with multiple BFERs and associated with multiple traffic flows, enabling one session to perform multiple detection functions and reducing overall session management complexity.
Solution Approach 2:
The patent uses parameter changes in BFD session configuration to manage multipoint relationships. By modifying session parameters to indicate multipoint capability and associated traffic flows, the system achieves reliable multi-BFER detection while using standardized parameter mechanisms that prevent complexity explosion.
Data Source
AI summary
A method and apparatus for implementing BFD in a BIER network, and a storage medium are provided. The method for implementing BFD in a BIER network includes: a first BFIR notifying each BFER in a BIER network of BIER information and BFD information; and the first BFIR establishing a multipoint BFD session with at least one BFER in the BIER network that successfully receives the BIER information and the BFD information, where the multipoint BFD session is associated with traffic flow information which is transmitted by the first BFIR.