None Stop Forwarding (NSF) is an important HA technology. It keeps neighbor relationships unchanged even in the case of a fault in the control plane of the router, protecting key services on the network from interruption.
BFD control packets are encapsulated in UDP packets for transmission. Which of the following is the destination port number for single-hop BFD control packets?
On a broadcast network or an NBMA network, not all neighbors need to set up adjacencies. Therefore, the concept about the adjacency is applicable to only the broadcast network or the NBMA network.
If both the ospf cost and bandwidth-reference commands are configured on an interface, the value set in the ospf cost command is used as the cost of the interface.