What is BFD

22

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

Other related questions:
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.

What is the BFD default detecting interval?
1000 milliseconds.

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 are the precautions for configuring multicast BFD
The BFD packets sent in multicast mode are untagged. When a port configured with multicast BFD receives tagged packets, it checks the tag of the packets. If the tag is different from the port's default VLAN ID, the port discards the packets. To configure multicast BFD on an interface, run the port default vlan command to specify the default VLAN of the interface.

What is BFD default detection multiplier?
3 times.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top