3.1.6.6 Graph Maintenance Timer

This is a periodic timer, initially set when the node begins listening, as specified in section 3.1.4.8. When the timer fires, graph maintenance MUST be performed as specified in section 3.1.7.16 and the timer MUST be reset to fire in 300 seconds if the node has at least one Link in the LINK_STATE_CONNECTED state, or in 30 seconds if the node has no Links in the LINK_STATE_CONNECTED state.