Console Interface
2-32
Displaying the Spanning Tree Port State

The parameters shown in the following figure and table are for port STA Information.

Alcatel OmniStack 8008
< Spanning Tree Port State >
Port Type Status Designated Designated Designated
Cost Bridge Port
----------------------------------------------------------------------
1 1000SX NO LINK 4 32768.0010B54C1EB6 128.1
2 1000SX NO LINK 4 32768.0010B54C1EB6 128.2
3 1000SX NO LINK 4 32768.0010B54C1EB6 128.3
4 1000SX NO LINK 4 32768.0010B54C1EB6 128.4
5 1000SX NO LINK 4 32768.0010B54C1EB6 128.5
6 1000SX NO LINK 4 32768.0010B54C1EB6 128.6
7 1000SX NO LINK 4 32768.0010B54C1EB6 128.7
8 1000SX NO LINK 4 32768.0010B54C1EB6 128.8
<Ok>
Use <TAB> or arrow keys to move. <Enter> to select.
Parameter Description
Type Shows port type as 1000SX (1000BASE-SX).
Status 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, bu t 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 de vice is
always forwarding.
• If two ports of a switch are connected to the same segment and the re 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 s ome of them change state
to listening, to learning, and then to forwarding.
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 (ID)
The priority and MAC address of the device through which this port mu st
communicate to reach the root of the spanning tree.
Designated Port
(ID)
The priority and number of the port on the designated bridging device throug h which
this switch must communicate with the root of the spanning tree.