Users Guide

● Assign a number as the bridge priority or designate it as the primary or secondary root bridge in CONFIGURATION mode.
Configure the priority value range, from 0 to 65535 in multiples of 4096, default 32768. The lower the number assigned, the
more likely the bridge becomes the root bridge.
spanning-tree rstp priority priority-value
View bridge priority and root bridge assignment
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 3417.4455.667f
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 36864, Address 90b1.1cf4.a523
Configured hello time 2, max age 20, forward delay 15
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
----------------------------------------------------------------------
ethernet1/1/6:3 128.282 128 2000 FWD 0 32768 3417.4455.667f 128.152
ethernet1/1/6:4 128.283 128 2000 BLK 0 32768 3417.4455.667f 128.153
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
-----------------------------------------------------------------
ethernet1/1/6:3 Root 128.282 128 2000 FWD 0 AUTO No
ethernet1/1/6:4 Altr 128.283 128 2000 BLK 0 AUTO No
Spanning-tree link type for rapid state transitions
As specified in IEEE 802.1w, OS10 assumes a port that runs in full-duplex mode is a point-to-point link. A point-to-point link
transitions to forwarding state faster. By default, OS10 derives the link type of a port from the duplex mode. You can override
the duplex mode using the spanning-tree link-type command.
OS10 assumes a port that runs in half-duplex mode is a shared link, to which the fast transition feature is not applicable. Also, If
you explicitly designate a port as a shared link, you cannot use the fast transition feature, regardless of the duplex setting.
To hasten the spanning-tree state transitions, you can set the link type to point-to-point. To set the link type to point-to-point:
● Use the following command in INTERFACE mode.
spanning-tree link-type point-to-point
RSTP commands
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
528 Layer 2