The value of vRtrLdpGenTargHelloTimeout specifies the hello time
also known as hold time. It is the time interval, in seconds, that
LDP waits before declaring a neighbor to be down. Hello timeout
is local to the system and is sent in the hello messages to a
neighbor. Hello timeout cannot be set to a value that is less
than 3 times the hello time.
This value is only applicable to targeted sessions and not to LDP
interfaces.