BFD has the following operational modes.
In asynchronous mode routers periodically send control packets to activate and maintain BFD sessions.
Asynchronous mode is available in two versions:
Asynchronous mode without echo
Asynchronous mode with echo (default value on Cisco routers)
How to Configure Bidirectional Forwarding Detection
You start a BFD process by configuring BFD on the interface. When the BFD process is started, no entries are created in the adjacency database, in other words, no BFD control packets are sent or received. BFD echo mode, which is supported in BFD Version 1 for Cisco IOS 12.4(9)T, is enabled by default. BFD echo packets are sent and received in addition to BFD control packets. The adjacency creation takes places once you have configured BFD support for the applicable routing protocols. This section contains the following procedures:
https://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html
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