auto—Configures the ports as auto links. If the link is in full-duplex mode or if link aggregation is enabled on the port, an auto link behaves like a point-to-point link.
broadcast—Configures the ports as broadcast ports. By default, all ports are broadcast links.
point-to-point—Configures the ports for rapid reconfiguration in an RSTP or MSTP (Multiple Spanning Tree Protocol) environment.
edge—Configures the ports as edge ports. For information about edge safeguard, see Configuring Edge Safeguard.