Reference Guide

Usage Information The RPVST+ protocol determines the root bridge but you can assign one bridge a lower priority to increase the
probability it being the root bridge. A lower priority value increases the probability of the bridge becoming a
root bridge.
Example
OS10(config)# spanning-tree vlan 10 priority 0
Supported Releases 10.2.0E or later
spanning-tree vlan priority (Interface)
Sets an interface priority when two bridges compete for position as the root bridge.
Syntax
spanning-tree vlan vlan-id priority value
Parameters value — Enter a priority value in the increments of 16 (0 to 240).
Default 128
Command Mode INTERFACE
Usage Information Breaks the tie between the two bridges which compete for root bridge.
Example
OS10(conf-if-eth1/1/4)# spanning-tree vlan 10 priority 16
Supported Releases 10.2.0E or later
spanning-tree vlan root
Designates a device as primary or secondary root bridge.
Syntax
spanning-tree vlan vlan-id root {primary | secondary}
Parameters
• vlan-id — Enter a VLAN ID number (1 to 4093).
• root — Designate the bridge as primary or secondary root.
• primary — Designate the bridge as primary or root bridge.
• secondary — Designate the bridge as secondary or secondary root bridge.
Default Not congured
Command Mode CONFIGURATION
Usage Information None
Example
OS10(config)# spanning-tree vlan 1 root primary
Supported Releases 10.2.0E or later
Rapid Spanning-Tree Protocol
Rapid Spanning-Tree Protocol (RSTP) is similar to STP, but provides faster convergence and interoperability with devices congured with
STP and MSTP. RSTP is disabled by default. All enabled interfaces in L2 mode are automatically added to the RSTP topology.
Conguring RSTP is a two-step process:
1 Ensure that the interfaces are in L2 mode.
236
Layer 2