Users Guide

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
Flush Interval 200 centi-sec, Flush Invocations 8
Flush Indication threshold 5
Interface Designated
Name PortID Prio Cost Sts Cost Bridge ID PortID
-----------------------------------------------------------------------------------------
---
ethernet1/1/5 128.40 128 500 BLK 500 32769 90b1.1cf4.9af2 128.40
ethernet1/1/6 128.48 128 500 BLK 500 32769 90b1.1cf4.9af2 128.48
ethernet1/1/7 128.56 128 500 FWD 500 32769 90b1.1cf4.a625 128.56
ethernet1/1/8 128.64 128 500 BLK 500 32769 90b1.1cf4.9af2 128.64
ethernet1/1/9 128.72 128 500 BLK 500 32769 90b1.1cf4.9af2 128.72
ethernet1/1/10 128.80 128 500 BLK 500 32769 90b1.1cf4.9af2 128.80
ethernet1/1/25 128.200 128 500 FWD 500 32769 90b1.1cf4.a625 128.200
ethernet1/1/26 128.208 128 500 FWD 0 32769 3417.ec37.1400 128.48
610
Layer 2