show spanning-tree

This command displays spanning tree settings for the common and internal spanning tree. The following details are displayed.

Format	show spanning-tree
Mode	Privileged EXEC User EXEC

Column

Meaning

Bridge Priority	Specifies the bridge priority for the Common and Internal Spanning tree (CST). The value lies between 0 and 61440. It is displayed in multiples of 4096.
Bridge Identifier	The bridge identifier for the CST. It is made up using the bridge priority and the base MAC address of the bridge.
Time Since Topology Change	Time in seconds.
Topology Change Count	Number of times changed.
Topology Change in Progress	Boolean value of the Topology Change parameter for the switch indicating if a topology change is in progress on any port assigned to the common and internal spanning tree.
Designated Root	The bridge identifier of the root bridge. It is made up from the bridge priority and the base MAC address of the bridge.
Root Path Cost	Value of the Root Path Cost parameter for the common and internal spanning tree.
Root Port Identifier	Identifier of the port to access the Designated Root for the CST
Bridge Max Age	Derived value.
Bridge Max Hops	Bridge max-hops count for the device.
Root Port Bridge Forward Delay	Derived value.
Hello Time	Configured value of the parameter for the CST.
Bridge Hold Time	Minimum time between transmission of Configuration Bridge Protocol Data Units (BPDUs).
CST Regional Root	Bridge Identifier of the CST Regional Root. It is made up using the bridge priority and the base MAC address of the bridge.
Regional Root Path Cost	Path Cost to the CST Regional Root.
Associated FIDs	List of forwarding database identifiers currently associated with this instance.
Associated VLANs	List of VLAN IDs currently associated with this instance.

The following example shows CLI display output for the command.

(Extreme 220) (Routing) #show spanning-tree
Bridge Priority................................ 32768
Bridge Identifier.............................. 80:00:00:10:18:48:FC:07
Time Since Topology Change..................... 8 day 3 hr 22 min 37 sec
Topology Change Count.......................... 0
Topology Change in progress.................... FALSE
Designated Root................................ 80:00:00:10:18:48:FC:07
Root Path Cost................................. 0
Root Port Identifier........................... 00:00
Bridge Max Age................................. 20
Bridge Max Hops................................ 20
Bridge Tx Hold Count........................... 6
Bridge Forwarding Delay........................ 15
Hello Time..................................... 2
Bridge Hold Time............................... 6
CST Regional Root.............................. 80:00:00:10:18:48:FC:07
Regional Root Path Cost........................ 0
     Associated FIDs           Associated VLANs
     ---------------           ----------------
(Extreme 220) (Routing) #

Published February 2019prev | next

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