Dell PowerConnect 5548 User Guide - Page 445

- Role - Displays the port role assigned by the STP algorithm in order to provide STP paths. The possible options are: • Root - This port provides the lowest cost path to forward packets to root switch. • Designated - This port is the interface through which the bridge is connected to the LAN, which provides the lowest cost path from the LAN to the Root Bridge. • Alternate - This port provides an alternate LAG to the root switch from the root interface. • Backup - This port provides a backup path to the designated port. Backup ports occur only when two ports are connected in a loop by a point-to-point link. Backup ports also occur when a LAN has two or more connections connected to a shared segment. • Disabled - This port is not participating in the Spanning Tree. - Mode - Displays if RSTP is enabled. - Fast Link Operational Status - Displays if Fast Link is enabled or disabled for the port or LAG. If Fast Link is enabled for an interface, the interface is automatically placed in the forwarding state. The possible options are: • Enable - Fast Link is enabled. • Disable - Fast Link is disabled. • Auto - Fast Link mode is enabled a few seconds after the interface becomes active. - Point-to-Point Admin Status - Select if a point-to-point links is established, or permits the device to establish a point-to-point link. The possible options are: • Enable - Enables the device to establish a point-to-point link, or specifies for the device to automatically establish a point-to-point link. To establish communications over a point-to-point link, the originating PPP first sends Link Control Protocol (LCP) packets to configure and test the data link. After a link is established and optional facilities are negotiated as needed by the LCP, the originating PPP sends Network Control Protocols (NCP) packets to select and configure one or more network layer protocols. When each of the chosen network layer protocols has been Dell PowerConnect 55xx Systems User Guide 445