Patent ID: 6049524
Filing Date: 2000-04-11
Classification: H04L

Abstract:
A multiplex router device having a plurality of route calculation units, each performing a routing protocol process to create a routing table for deciding a packet route, wherein when one of said route calculation units is set in an active mode and at least one of other route calculation units is set in a standby mode, and if a failure occurs in said route calculation unit in the active mode, said one route calculation unit in the standby mode is brought into the active mode,wherein said route calculation unit comprises:memory means for holding routing protocol information when said route calculation unit thereof is in the active mode, said protocol information including network link-state information showing connections of said multiplex router and other routers with networks, neighboring router states showing states with neighboring routers, and interface states showing states of network interfaces to connect said multiplex router device to networks;process means for executing said routing protocol process, including collection of said routing protocol information held in said memory means, according to said routing protocol information held in said memory means;notification means for sending, when said route calculation unit thereof is in the active mode, to said router calculation unit in the standby mode only the network link-state information out of the network link-state information, neighboring router states, and interface states stored in said memory means; andholding means for holding in said memory means said network link-state information sent from said route calculation unit in the active mode when said route calculation unit is in the standby mode.