# L2 STATUS SPANNING TREE

## Qualifiers:

None

## Purpose:

NOTE: This maintenance command is not applicable to MiVoice Business for Industry Standard Servers (ISS).

Displays Spanning Tree information at the bridge and port level.

## Details:

The command output is divided into Bridge information and Port information as follows:

Bridge Information
Time Since Topology Change | The time (in seconds) since the last time a topology change was detected by L2 switch.
Topology Change Count | The total number of topology changes detected by the L2 switch since the controller was last reset or initialized.
Root MAC Address/Priority | The bridge identifier of the spanning tree root as determined by this node.
Root Path Cost | The path cost from the L2 switch to the root. (0 if root).
Root Port | The number of the port with the least cost to the root (0 if root).
Hello Time | The amount of time (in hundredths of a second) between the transmission of Configuration BPDU (Bridge Protocol Data Unit) A spanning tree protocol (STP) message unit that describes the attributes of a switch port such as its MAC address, priority and cost to reach. BPDUs enable switches that participate in a spanning tree protocol to gather information about each other. s by the L2 switch on any port when it is the root of the spanning tree or trying to become so.
Hold Time | The time interval (in seconds) during which no more than two Configuration BPDU (Bridge Protocol Data Unit) A spanning tree protocol (STP) message unit that describes the attributes of a switch port such as its MAC address, priority and cost to reach. BPDUs enable switches that participate in a spanning tree protocol to gather information about each other. s shall be transmitted by the L2 switch.
Max. Age | The maximum age (in seconds) of Spanning Tree Protocol information learned from the network on any port before it is discarded.
Forward Delay | The amount of time (in seconds) that the Layer 2 switch stays in each of the Listening and Learning states.
Port Information
Priority | The value in the range 0-15 specifying the preference given to this port relative to others for forwarding traffic out of the topology. A higher value means lower priority.
State | A value indicating the state of the port as follows: disabled(1) blocking(2) listening(3) learning(4) forwarding(5) broken(6)
Path Cost | The contribution of this port to the path cost of paths towards the spanning tree root.
Designated Bridge | The ID of the bridge considered to be the Designated Bridge for this port's segment.
Designated Port | The ID of the port on the Designated Bridge for this port's segment.

## Example:

### Entry: L2 STATUS SPANNING-TREE

System Response:

LAYER 2 SWITCH SPANNING TREE:

Time Since Topology Change: 46697 sec.
Topology Change Count : 0
Bridge Address / Priority : 08000f1b3ef9 / 61440
Root Address / Priority : 000000000000 / 61440
Root Path Cost : 0
Root Port : 0
Hello Time : 2 sec.

Hold Time : 6 sec.

Max. Age : 20 sec.

Forward Delay : 15 sec.

Port Prio. State Cost Designated Bridge Desig. Port Edge P2P

---- ----- ---------- ---------- ------------------ ----------- ---- ---

1 128 Disabled 0 0-000000000000 0-0 No No

2 128 Disabled 0 0-000000000000 0-0 No No

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