Frame relay switching apparatus and router

摘要: A frame relay switching apparatus in a network employs format used communication between plurality of terminals, performed by identifying destination data link connection identifier (DLCI) an address field. Priority or non-priority information for provided being transmitted terminal is registered each DLCI so that zone assigned to them not overflown, prevent having priority from discarded. In case congestion, all frames identical DLCIs are discarded at the same time. The includes transmitting buffers outgoing line, and common buffer, which can be shared lines. congested line writes received buffer takes out write it respective when congestion has been resolved. When performing inter-LAN communication, router sets level, determined accordance with on LAN protocol, field sends network.