Alcatel OmniStack 8008 User Manual page 41

Parameter
Type
Status
Designated Cost
Designated Bridge (ID)
Designated Port (ID)
Description
Shows port type as 1000SX (1000BASE-SX).
Displays the current state of this port within the spanning tree:
Disabled Port has been disabled by the user or has failed diagnostics.
No Link There is no valid link on the port.
Blocking Port receives STA configuration messages, but does not
forward packets.
Listening Port will leave blocking state due to topology change, starts
transmitting configuration messages, but does not yet forward
packets.
Learning 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 The port forwards packets, and continues learning addresses.
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 blocked.
• All ports are blocked when the switch is booted, then some of them
change state to listening, to learning, and then to forwarding.
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.
The priority and MAC address of the device through which this port must
communicate to reach the root of the spanning tree.
The priority and number of the port on the designated bridging device through
which this switch must communicate with the root of the spanning tree.
Configuring the Switch
2-31