What is the BFD default detecting interval?

5

1000 milliseconds.

Other related questions:
What is BFD default detection multiplier?
3 times.

What features can BFD detect
BFD can detect faults in static routes, RIP, OSPF, IS-IS, BGP, VRRP, PIM, LDP LSP, and MPLS TE. For CE12800 series switches, BFD can detect faults in static routes, RIP, OSPF, IS-IS, BGP, VRRP, PIM, and MPLS TE. For CE7800, CE6800, and CE5800 series switches, BFD can detect faults in static routes, RIP, OSPF, IS-IS, BGP, VRRP, PIM, and LDP LSP. BFD for LDP LSP is supported only by the CE7850EI, CE6850HI, CE6850U-HI, and CE6851HI.

What is the function of the default multicast address of BFD on an AR
When BFD is used to detect the physical status of a link, you may not specify the remote IP address. In some situations, the remote end such as the Eth-Trunk member link is not assigned an IP address. A BFD session needs to be bound to a multicast IP address and the AR needs to send BFD control packets to the multicast IP address. In the following situations, you must change the default multicast IP address: - On the network, other protocols use the multicast IP address. - Multiple BFD sessions exist on the BFD detection path. For example, when Layer 3 interfaces are connected through Layer 2 switching devices that support BFD, you must configure different default multicast IP addresses for the devices where different BFD sessions are established. You can run the default-ip-address ip-address command to configure the default multicast IP address for the BFD session. [Huawei] bfd [Huawei-bfd] default-ip-address 224.0.0.150 //Set the default multicast address bound to the BFD session to 224.0.0.150.

What is BFD
Bidirectional Forwarding Detection (BFD) quickly detects communications faults between systems and reports corresponding faults to the upper-layer protocol.

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