Connectivity Guide
Load balance and root selection
All VLANs use the same forwarding topology — R2 is elected as the root and all 10G Ethernet ports have the same cost. RPVST+ changes
the bridge priority of each bridge so that a dierent forwarding topology generates for each VLAN.
To achieve RPVST+ load balancing, assign a dierent priority on each bridge.
Enable RPVST+
By default, RPVST+ is enabled and creates an instance only after you add the rst member port to a VLAN. To participate in RPVST+, port-
channel or physical interfaces must be a member of a VLAN. Add all physical and port-channel interfaces to the default VLAN (VLAN1).
• Enable Rapid-PVST+ mode in CONFIGURATION mode.
spanning-tree mode rapid-pvst
Congure RPVST+
OS10(config)# spanning-tree mode rapid-pvst
View RPVST+ conguration
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 32768, Address 3417.4455.667f
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 32769, 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
------------------------------------------------------------------------
ethernet1/1/5 128.276 128 500 FWD 0 32768 3417.4455.667f 128.146
ethernet1/1/6 128.280 128 500 BLK 0 32768 3417.4455.667f 128.150
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
340
Layer 2