D-Link DXS-3250E - xStack Switch, Web/Installation Manual

Page: 235 / 424

DXS-3227, DXS-3227P, DXS-3250 and DXS-3250E EWS User Guide
Page 234
•
Role — Displays the port role assigned by the STP algorithm to provide to STP paths. The possible field val-
ues are:
–
Root — Provides the lowest cost path to forward packets to the root switch.
–
Designated — The port or LAG through which the designated switch is attached to the LAN.
–
Alternate — Provides an alternate path to the root switch from the root interface.
–
Backup — Provides a backup path to the designated port path toward the Spanning Tree leaves. Backup
ports occur only when two ports are connected in a loop by a point-to-point link, or when a LAN has two
or more connections connected to a shared segment.
–
Disabled — The port is not participating in the Spanning Tree.
•
Mode —Displays the current STP mode. The STP mode is selected in the STP Properties Page . The possible
field values are:
–
STP — Classic STP is enabled on the device.
–
Rapid STP — Rapid STP is enabled on the device.
–
Multiple STP — Multiple STP is enabled on the device.
•
Fast Link Operational Status — Indicates whether Fast Link is enabled or disabled for the port or LAG. If
Fast Link is enabled for a port, the port is automatically placed in the forwarding state.
•
Point-to-Point Admin Status — Indicates whether a point-to-point link is established, or if the device is per-
mitted to establish a point-to-point link. The possible field values are:
–
Enable — Enables a point-to-point link, or is configured 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 Protocol (NCP) packets to
select and configure one or more network layer protocols. When each of the chosen network layer
protocols has been configured, packets from each network layer protocol can be sent over the link. The
link remains configured for communications until explicit LCP or NCP packets close the link, or until some
external event occurs. This is the actual switch port link type. It may differ from the administrative state.
–
Disable — Disables point-to-point link.
–
Auto — Enables the device to establish automatically point-to-point link.
•
Point-to-Point Operational Status — Displays the point-to-point operating state.
•
Activate Protocol Migration — Activates sending Link Control Protocol (LCP) packets to configure and test
that the data link is enabled.