Working principle of BFD for IS-IS on S Series switches

Q: What is the working principle of BFD for IS-IS?
A: Bidirectional Forwarding Detection (BFD) is a simple hello protocol and similar to the Hello protocol of IS-IS in many aspects. Two systems periodically send BFD detection packets on the session channel between them. If one system does not receive any BFD detection packet from its peer within a certain period of time, the system considers that the bidirectional channel to the neighboring system is faulty.
IS-IS, in conjunction with BFD, can fast detect neighboring status. In this manner, IS-IS devices can fast converge routes.

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