| 摘要 |
System for routing data units, comprising a routing information base (RIB) storing routing entries; a forwarding information base (FIB) storing forwarding information used to forward data units to a plurality of destinations; a computing function for computing for each destination of said plurality of destinations a normal shortest path and an alternate shortest path using routing information received from adjacent nodes and/or local information; said forwarding information base storing for each of said plurality of destinations normal forwarding information and alternate forwarding information necessary to forward a data unit using the normal shortest path and the alternate shortest path, respectively; a forwarding control means for indicating to at least one following hop of the alternate shortest path that the alternate forwarding information should be used for this data unit.
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