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When the Spanning Tree Protocol is enabled on an Ethernet bridge or switch port to which a Macintosh computer is directly connected the computer may be unable to use AppleTalk or NetInfo services. Appletalk issues observed range from no AppleTalk services, local (to this specific network) AppleTalk services, degraded performance, and intermittent network services. If the Spanning Tree protocol is enabled on the port to which a Macintosh computer is connected packets necessary for AppleTalk address assignment and network discovery can be dropped by the switch. This causes the Macintosh to acquire invalid or incomplete network information resulting in the behavior discussed above.