BFD Parameter Negotiation Verification via Packet Matching

The patent applies preliminary action by generating and embedding a verification value in the negotiation packet before the negotiation process occurs. This verification value is calculated based on the negotiation content and placed in the Required Min Echo Rx Interval field. When the negotiation response is received, the verification value is checked to ensure the negotiation packets are matched correctly, preventing erroneous negotiation due to packet disorder even when negotiation occurs frequently.

The patent applies parameter changes by utilizing the existing Required Min Echo Rx Interval field in the BFD control packet to carry the verification value. Instead of adding a new field or increasing packet size, the verification value is encoded within the existing parameter structure. This approach maintains the original negotiation speed while adding verification capability, as no additional packet exchange or complex processing is required.

The patent applies self-service by having the first apparatus generate its own verification value based on the negotiation content it initiates, and then use that same verification value to verify the received negotiation response packet. The verification process is self-contained within the apparatus that initiated the negotiation, eliminating the need for complex external verification mechanisms or additional protocol infrastructure. The apparatus serves its own verification needs using its own negotiation parameters.