Alcatel OmniStack LS 6248 User Manual page 222

3
Configuring the Switch
• 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.
• Disable — The port is not participating in the Spanning Tree.
• Mode — Displays the current STP mode. The STP mode is selected in the STP
General 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 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.
• Port Status — Displays the RSTP status for the port on which RSTP is enabled.
The possible field values are:
• Disable — indicates the port is currently disabled.
• Forwarding — Indicates the port is currently linked and forwarding traffic.
• Point-to-Point Status — Indicates whether a point-to-point link is established, or
if the device is permitted to establish a point-to-point link. The possible field values
are:
• Enable — The device is permitted to establish 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 — The device automatically establishes a point-to-point link.
• Activate Protocol Migration — Click the Activate button to send Link Control
Protocol (LCP) packets.
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