Deployment Guide

• The Dell Networking OS supports only one Rapid Spanning Tree (RST) instance.
• All interfaces in virtual local area networks (VLANs) and all enabled interfaces in Layer 2 mode are automatically added to the RST
topology.
• Adding a group of ports to a range of VLANs sends multiple messages to the rapid spanning tree protocol (RSTP) task, avoid using the
range command. When using the range command, Dell Networking recommends limiting the range to ve ports and 40 VLANs.
Conguring Interfaces for Layer 2 Mode
To congure and enable interfaces in Layer 2 mode, use the following commands.
All interfaces on all bridges that participate in Rapid Spanning Tree must be in Layer 2 and enabled.
1 If the interface has been assigned an IP address, remove it.
INTERFACE mode
no ip address
2 Place the interface in Layer 2 mode.
INTERFACE mode
switchport
3 Enable the interface.
INTERFACE mode
no shutdown
Example of Verifying an Interface is in Layer 2 Mode and Enabled
To verify that an interface is in Layer 2 mode and enabled, use the show config command from INTERFACE mode. The bold lines
indicate that the interface is in Layer 2 mode.
Dell(conf-if-te-1/1)#show config
!
interface TenGigabitEthernet 1/1
no ip address
switchport
no shutdown
Dell(conf-if-te-1/1)#
Enabling Rapid Spanning Tree Protocol Globally
Enable RSTP globally on all participating bridges; it is not enabled by default.
When you enable RSTP, all physical and port-channel interfaces that are enabled and in Layer 2 mode are automatically part of the RST
topology.
• Only one path from any bridge to any other bridge is enabled.
• Bridges block a redundant path by disabling one of the link ports.
To enable RSTP globally for all Layer 2 interfaces, use the following commands.
1 Enter PROTOCOL SPANNING TREE RSTP mode.
CONFIGURATION mode
protocol spanning-tree rstp
2 Enable RSTP.
PROTOCOL SPANNING TREE RSTP mode
no disable
To disable RSTP globally for all Layer 2 interfaces, enter the disable command from PROTOCOL SPANNING TREE RSTP mode.
Rapid Spanning Tree Protocol (RSTP)
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