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Configuring the Switch
3-82
The rules defining port status are:
- A port on a network segment with no other STA compliant bridging device is
always forwarding.
- If two ports of a switch are connected to the same segment and there is no
other 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 travel 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 device
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 designated
bridging device through which this switch must communicate with the root 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 3-84.
• Oper Edge Port – This parameter is initialized to the setting for Admin Edge
Port in STA Port Configuration on page 3-84 (i.e., true or false), but will be set
to false if a BPDU is received, indicating that another bridge 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.
• Trunk Member – Indicates if a port is a member of a trunk.
(STA Port Information only)
Alternate port receives more
useful BPDUs from another
bridge and is therefore not
selected as the designated
port.
x
R: Root Port
A: Alternate Port
D: Designated Port
B: Backup Port
RR
ADB