3.1.5.1 Receiving an STP Packet

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IPo1394 MUST correctly recognize the STP packet by recognizing the ether_type value in the packet encapsulation header that has a value of 0x0777. The STP packet format is specified in section 2.2.1. After receiving the STP packet, the IPo1394 protocol passes it up to the STP layer, which implements the network loop detection logic, as specified in [IEEE802.1D].