How does BFD for IS-IS work

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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.

Other related questions:
Can the policy route work with BFD and NQA ?
It can not support.

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.

Whether USG firewalls support the BFD
USG firewalls support the BFD.

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