This read-write integer configures the Hello Time parameter, from 1 to 10 seconds with a default of 2, that this bridge will use for Configuration BPDU transmissions if it becomes or is attempting to become the spanning tree root. An admin lowers this value to speed up root bridge failure detection across the network, at the cost of slightly more spanning tree control traffic. For example, setting bdgdeviceBdgHello to 1 second on a bridge intended to be the network's root would make other bridges detect its failure faster than the default 2-second interval would allow.