Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 430)

400 Multi-Service IronWare Switching Configuration Guide
53-1003036-02
show spanning-tree
12
show spanning-tree
Displays Spanning Tree Protocol (STP) information.
Syntax show spanning-tree [blocked] [vlan vlan-id]
Parameters blocked (Optional) Displays information in respect of ports blocked by the STP only.
vlan vlan-id (Optional) Specifies the display of information for a specific port-based VLAN.
Command
Modes
User EXEC mode
Privileged EXEC mode
Global configuration mode
Usage
Guidelines
Command
Output
The show spanning-tree command displays the following information:
Output field Description
Global STP Parameters
VLAN ID The port-based VLAN that contains this spanning tree and the number of STP instance
on the VLAN. VLAN 1 is the default VLAN. If you have not configured port-based VLANs
on this device, all STP information is for VLAN 1.
Bridge Parameters
Bridge Identifier The ID assigned by STP to this bridge for this spanning tree in hexadecimal.
NOTE: If this address is the same as the Root ID, then this device or VLAN is the root
bridge for its spanning tree.
Bridge MaxAge sec The number of seconds this bridge waits for a hello message from the root bridge
before deciding the root has become unavailable and performing a reconvergence.
Bridge Hello sec The interval between each configuration BPDU sent by the bridge.
Bridge FwdDly sec The number of seconds this bridge waits following a topology change and consequent
reconvergence.
Hold Time sec The minimum number of seconds that must elapse between transmissions of
consecutive Configuration BPDUs on a port.
Last Topology Change sec The number of seconds since the last time a topology change occurred.
Topology Change cnt The number of times the topology has changed since this device was reloaded.
Root Bridge Parameters
Root Identifier The ID assigned by STP to the root bridge for this spanning tree in hexadecimal.
Root Cost The cumulative cost from this bridge to the root bridge. If this device is the root bridge,
then the root cost is 0.
DesignatedBridge
Identifier The designated bridge to which the root port is connected. The designated bridge is
the device that connects the network segment on the port to the root bridge.
Root Port The port on this device that connects to the root bridge. If this device is the root
bridge, then the value is “Root” instead of a port number.
Max Age sec The number of seconds this root bridge waits for a hello message from the bridges
before deciding a bridges has become unavailable and performing a reconvergence.