STA (Spanning Tree Algorithm)

Ports

The parameters shown in the following figure and table are for port STA Information (Port 1~8).

Parameter

Description

 

 

 

Port Status

Displays the current state of this port within the spanning tree:

 

No Link

There is no valid link on the port.

 

Disabled

Port has been disabled by the user or has failed diagnostics.

 

Blocked

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.

Forward Transitions

The number of times the port has changed status to 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 priority and MAC address of the device through which this port must

 

communicate to reach the root of the spanning tree.

Designated Port

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.

 

 

 

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Alcatel Carrier Internetworking Solutions 8008 manual STA Spanning Tree Algorithm, Ports
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8008 specifications

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