This read-create value sets, in milliseconds, how often this router transmits Level 1 IIH PDUs on a multiaccess network when it has been elected the Level 1 Designated Intermediate System. Because the DIS floods hellos far more often than non-DIS routers to keep the LAN's pseudonode adjacencies current, this timer directly affects how quickly other systems on that LAN notice the DIS is alive. An administrator might tighten csIsisCircDRL1HelloTimer to 3300 milliseconds on a busy Ethernet segment carrying many Level 1 routers so LAN adjacency state converges faster after a topology change.