API Guide

● Configure the device as the root or secondary root in CONFIGURATION mode.
spanning-tree vlan vlan-id root {primary | secondary}
○ vlan-id — Enter the VLAN ID number, from 1 to 4093.
○ primary — Enter the bridge as primary or root bridge. The primary bridge value is 24576.
○ secondary — Enter the bridge as the secondary root bridge. The secondary bridge value is 28672.
Configure root bridge as primary
OS10(config)# spanning-tree vlan 1 root primary
Verify root bridge information
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 24577, Address 90b1.1cf4.a523
Root Bridge hello time 2, max age 20, forward delay 15
Bridge ID Priority 24577, Address 90b1.1cf4.a523
We are the root of VLAN 1
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 24577 90b1.1cf4.a523 128.276
ethernet1/1/6 128.280 128 500 LRN 0 24577 90b1.1cf4.a523 128.280
Interface
Name Role PortID Prio Cost Sts Cost Link-type Edge
-------------------------------------------------------------
ethernet1/1/5 Desg 128.276 128 500 FWD 0 AUTO No
ethernet1/1/6 Desg 128.280 128 500 LRN 0 AUTO No
Global parameters
All non-root bridges accept the timer values on the root bridge.
Forward-time
Amount of time required for an interface to transition from the Discarding state to the Learning state or
from the Learning state to the Forwarding state.
Hello-time Time interval within which the bridge sends BPDUs.
Max-age Length of time the bridge maintains configuration information before it refreshes information by
recomputing the Rapid-PVST topology.
● Modify the forward-time in seconds in CONFIGURATION mode, from 4 to 30, default 15.
spanning-tree vlan vlan-id forward-time seconds
● Modify the hello-time in seconds in CONFIGURATION mode, from 1 to 10, default 2. With large configurations involving more
numbers of ports, Dell EMC recommends increasing the hello-time.
spanning-tree vlan vlan-id hello-time seconds
● Modify the max-age (in seconds) in CONFIGURATION mode, from 6 to 40, default 20.
spanning-tree vlan vlan-id max-age seconds
View Rapid-PVST global parameters
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 90b1.1cf4.a523
Root Bridge hello time 2, max age 20, forward delay 15
Layer 2
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