Avaya 882 Manuel D’Utilisation

7-16

User Guide for the Avaya P580 and P882 Multiservice Switches, v6.1

Chapter 7

Use the show spantree port {802.1D | vlan {<vlan-id> | name <vlan-
name>}} command to view information about Spanning Tree bridge ports. 

Role

The current role of the port. 

The options are: 

• Root

• Designated

• Alternate

• Backup

• Disabled

For information about each of these roles, see “

State

Current bridging state of the port. 

The options are:

• Discarding — The port is either disabled, 

blocking or listening.

• Learning — The port is learning new MAC 

addresses, but not yet forwarding traffic.

• Forwarding — The port has been selected by 

Spanning Tree to forward traffic and is 
forwarding traffic currently.

Designated Root

Root bridge for this spanning tree.

Designated Cost

The path cost to the designated root of the segment that 
is connected to this port.

Designated Bridge

ID of the designated bridge for this segment.

Designated Port

ID of the designated port on the designated bridge for 
this segment. 

For information about each of these roles, see “

Fwd Trans

Number of times that this port has changed from 
discarding state to forwarding state. 

Protocol

Type of BPDUs that the port is transmitting (RSTP or 
STP). If the switch is running RSTP, and this field 
displays STP, the port has detected the presence of 
bridges running STP and is operating in common-
spanning-tree mode.