Candidate Access Router Discovery (CARD)

To enable seamless IP-layer handover of a mobile node (MN) from oneaccess router (AR) to another, the MN is required to discover theidentities and capabilities of candidate ARs (CARs) for handover priorto the initiation of the handover. The act of discovery of CARs hastwo aspects: identifying the IP addresses of the CARs and findingtheir capabilities. This process is called "candidate access routerdiscovery" (CARD). At the time of IP-layer handover, the CAR, whosecapabilities are a good match to the preferences of the MN, is chosenas the target AR for handover. The protocol described in this documentallows a mobile node to perform CARD. This memo defines anExperimental Protocol for the Internet community.