Reference Guide

show spanning-tree active
Displays the RSTP configuration and information for RSTP-active interfaces.
Syntax
show spanning-tree active
Parameters None
Default Not configured
Command Mode EXEC
Usage
Information
None
Example
OS10# show spanning-tree active
Spanning tree enabled protocol rstp with force-version rstp
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32768, Address 90b1.1cf4.9b8a
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32768, Address 90b1.1cf4.9b8a
We are the root
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
----------------------------------------------------------------------
ethernet3/1/1 244.128 128 500 BLK 0 32768 90b1.1cf4.9b8a 128.244
ethernet3/1/2 248.128 128 500 BLK 0 32768 90b1.1cf4.9b8a 128.248
ethernet3/1/3 252.128 128 500 FWD 0 32768 90b1.1cf4.9b8a 128.252
ethernet3/1/4 256.128 128 500 BLK 0 32768 90b1.1cf4.9b8a 128.256
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
------------------------------------------------------------
ethernet3/1/1 Altr 128.244 128 500 BLK 0 AUTO No
ethernet3/1/2 Altr 128.248 128 500 BLK 0 AUTO No
ethernet3/1/3 Root 128.252 128 500 FWD 0 AUTO No
ethernet3/1/4 Altr 128.256 128 500 BLK 0 AUTO No
Supported
Releases
10.2.0E or later
show spanning-tree interface
Displays spanning-tree interface information for Ethernet and port-channels.
Syntax
show spanning-tree interface {ethernet node/slot/port [:subport] | port-
channel port-id} [detail]
Parameters
● ethernet node/slot/port[:subport] — Displays spanning-tree information for a physical
interface.
● port-channel port-id — Displays spanning-tree information for a port-channel number (1 to
128).
● detail — (Optional) Displays detailed information on the interface.
Default Not configured
Command Mode EXEC
Usage
Information
None
Example
OS10# show spanning-tree interface ethernet 1/1/6:2 detail
Port 281 (ethernet1/1/6:2) of RSTP 1 is root Forwarding
Port path cost 2000, Port priority 128, Port Identifier 281.128
Designated root has priority 32768, address 34:17:44:55:66:7f
Designated bridge has priority 32768, address 34:17:44:55:66:7f
Designated port id is 151.128, designated path cost
Layer 2 231