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3.1.3 Initialization

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The Spanning Tree Algorithm and Protocol (STP) is unchanged from what is specified in [IEEE802.1D] section 9, but because it expects EUI-48 addresses (as Ethernet uses), it is necessary to explain how it uses addresses on 1394 media.

STP specifies how to generate a 64-bit Extended Unique Identifier - 64 (EUI-64) (as specified in [IEEE802.1D] section 9) which is used as the bridge ID, from an EUI-48. 1394 uses an EUI-64 value (as specified in [IEEE1394] section 8.3.2.5.7.1) instead of an EUI-48 value. As a result, at initialization time, IPo1394 SHOULD generate an EUI-48 by using any local algorithm that generates a value that is unique on the subnet, for use by STP when it needs to construct a bridge ID.<6>

No additional initialization is required beyond that in the base protocol, as specified in [RFC2734].<7>