Users Guide

Table Of Contents
If Force Protocol Version is STP or RSTP, the received BPDUs are considered from a different MST Region.
Default behavior is MSTP operation mode, which allows full MSTP behavior.
OS10 does not support enabling force version per MST instance.
Force protocol version in Rapid-PVST
Spanning-tree Rapid-PVST force-version (STP)
Setting the force version to STP forces the Rapid-PVST protocol to operate in 802.1D STP mode instead of the default
protocol mode RSTP on VLAN 1.
If force version is STP, the rapid transitions are disabled on VLAN 1.
OS10 does not support running force version STP on per VLAN level.
Load balance and root selection
By default, all VLANs use the same forwarding topology R2 is elected as the root and all 10G Ethernet ports have the same
cost. Bridge priority can be modified for each VLAN to enable different forwarding topologies.
To achieve Rapid-PVST load balancing, assign a different priority on each bridge.
Enable Rapid-PVST
By default, Rapid-PVST is enabled and creates an instance during VLAN creation. To participate in Rapid-PVST, port-channel or
physical interfaces must be a member of a VLAN.
Enable Rapid-PVST mode in CONFIGURATION mode.
spanning-tree mode rapid-pvst
Configure Rapid-PVST
OS10(config)# spanning-tree mode rapid-pvst
View Rapid-PVST configuration
os10# show spanning-tree active
Spanning tree enabled protocol rapid-pvst with force-version rstp
VLAN 1
Executing IEEE compatible Spanning Tree Protocol
Root ID Priority 32769, Address 3417.ec37.1400
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32769, Address 90b1.1cf4.a625
Configured hello time 2, max age 20, forward delay 15
608
Layer 2