Can PIM BFD take effect if global BFD is not enabled

4

PIM BFD takes effects only after global BFD is enabled.

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

Differences between dynamic BFD for IS-IS and static BFD for IS-IS on S series switches
The differences between dynamic BFD for IS-IS and static BFD for IS-IS are as follows: Dynamic BFD for IS-IS is triggered by upper-layer protocols. BFD sessions are dynamically established and link failures are detected based on BFD session status. Static BFD for IS-IS is manually configured to detect link failures.

Whether the AR support BFD
All AR models of all versions support BFD.

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.

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.

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