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Tag Switching is a Cisco proprietary technology designed to merge the intelligence of routing with the performance of layer 2 (data link) switching networks. It was designed for routed IP networks or switched ATM and Ethernet networks. The architecture is discussed in RFC 2105 (Cisco Systems' Tag Switching Architecture Overview, February 1997). Cisco calls Tag Switching a prestandard implementation of the IETF's MPLS (Multiprotocol Label Switching). Cisco has worked with the IETF to incorporate the features and benefits of Tag Switching into MPLS. See "Label Switching" and "MPLS (Multiprotocol Label Switching)."
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