the BFD session went down).
<p>BIRD implements basic BFD behavior as defined in <rfc id="5880"> (some
-advanced features like the echo mode or authentication are not implemented), IP
-transport for BFD as defined in <rfc id="5881"> and <rfc id="5883"> and
-interaction with client protocols as defined in <rfc id="5882">.
+advanced features like the echo mode are not implemented), IP transport for BFD
+as defined in <rfc id="5881"> and <rfc id="5883"> and interaction with client
+protocols as defined in <rfc id="5882">.
<p>BFD packets are sent with a dynamic source port number. Linux systems use by
default a bit different dynamic port range than the IANA approved one
<code>
protocol bfd [<name>] {
accept [ipv4|ipv6] [direct|multihop];
+ strict bind <switch>;
zero udp6 checksum rx <switch>;
interface <interface pattern> {
interval <time>;