An apparatus and technique configures an intermediate network node, such as an aggregation router, to implement automatic protection switching (APS) redundancy among its line cards in the event of a failure to one of those cards. The APS line card redundancy provides redundancy among a pair of line cards...http://www.google.de/patents/US7065038?utm_source=gb-gplus-sharePatent US7065038 - Automatic protection switching line card redundancy within an intermediate network node
