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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 3-130.
•
Oper Edge Port – This parameter is initialized to the setting for
Admin Edge Port in STA Port Configuration on page 3-130 (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.
S
T
PANNING
REE
A
C
LGORITHM
ONFIGURATION
3-127
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