The value of vRtrLdpNgIfParamIPv6HelloTimeout 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 LDP IPv6 interfaces.