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802.1aj-2009  -  IEEE Standard for Local and Metropolitan Area Networks - Virtual Bridged Local Area Networks Amendment 11: Two-Port Media Access Control (Mac) Relay

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This amendment to IEEE Std 802.1 Q specifies the function of a MAC Relay with two MACs, and the protocols and procedures to support its operation. A MAC Relay is transparent to all frame-based media independent protocols except those explicitly addressed to this device. It is remotely manageable through at least one of its external MACs, and signals a failure of either MAC'S LAN through the other MAC.