How does BFD for IS-IS work

BFD is a simple hello protocol. It is similar to the hello protocol of IS-IS in many aspects. Two devices periodically send BFD detection packets on the channel between them. If one device does not receive the detection packet from the peer within a certain period of time, the device believes that the bidirectional channel to the peer becomes faulty.

IS-IS, in conjunction with BFD, can fast detect the neighboring status. In this manner, IS-IS devices can fast converge.

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