Configuring the Switch

3-96

3
Displaying Interface Settings
The STA Port Information and STA Trunk Information pages display the current
status of ports and trunks in the Spanning Tree.
Field Attributes
•Spanning Tree – Shows if STA has been enabled on this interface.
•STA Status – Displays current state of this port within the Spanning Tree:
•Discarding - Port receives STA configuration messages, but does no t forward
packets.
•Learning - Port has transmitted configuration messages for an interval set by
the Forward Delay parameter without receiving contradictory information. Port
address table is cleared, and the port begins learning addresses.
•Forwarding - Port forwards packets, and continues learning addresses.
The rules defining port status are:
- A port on a network seg ment with no other STA compliant bridging device is
always forwarding.
- If two ports of a sw itch are connected to the same segment and there is no ot her
STA device attached to this segment, the port with the smaller ID forwards
packets and the other is discarding.
- All ports are discarding when the switch is booted, then some of them change
state to learning, and then to forwarding.
•Forward Transitions – The number of times this port has transitioned from the
Learning state to the Forwarding state.
•Designated Cost – The cost for a packet to trav el from this port to the root in the
current Spanning Tree configuration. The slower the media, the higher the cost.
•Designated Bridge – The bridge priority and MAC address of the dev ice through
which this port must communicate to reach the root of the Spanning Tree.
•Designated Port – The port priority and number of the port on the design ated
bridging device through which this switch must communicate with the roo t of the
Spanning Tree.
•Oper Link Type – The operational point-to-point status of the LAN segment
attached to this interface. This parameter is determined by manual configuration or
by auto-detection, as described for Admin Link Type in STA Port Configuration on
page 3-99.
•Oper Edge Port – This parameter is initialized to the setting for Admin Edge Port
in STA Port Configuration on page3-99 (i.e., true or false), but will be set to false
if a BPDU is received, indicating that another bri dge is attached to this port.
•Port Role – Roles are assigned according to whether the port is part of the active
topology connecting the bridge to the root bridge (i.e., root port), connecting a LAN
through the bridge to the root bridge (i.e., designated port), or is an alternate or
backup port that may provide connectivity if other bridges, bridge ports, or LANs
fail or are removed. The role is set to disabled (i.e., disabled port) if a port has no
role within the spanning tree.