7-16 User Guide for the Avaya P580 and P882 Multiservice Switches, v6.1
Chapter 7
CLI Command 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 “How
RSTP Achieves Rapid Recovery.”
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 “How
RSTP Achieves Rapid Recovery.”
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.

Table 7-4. Spanning Tree Bridge Port Information

Field Explanation

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