Dell PowerConnect J-EX4200-24T Software Manual page 1356

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS
Requirements
Overview and Topology
1284
This example uses the following hardware and software components:
Four J-EX Series switches
Before you configure the switches for RSTP, be sure you have:
Installed the four switches. See "Connecting and Configuring a J-EX Series Switch
(J-Web Procedure)" on page 163.
Performed the initial software configuration on all switches. See Installing and
Connecting a J-EX4200 Switch.
In this example, four J-EX Series switches are connected in the topology displayed in
Figure 33 on page 1284 to create a loop-free topology.
Figure 33: Network Topology for RSTP
The interfaces shown in Table 171 on page 1285 will be configured for RSTP.
NOTE: You can configure RSTP on logical or physical interfaces. This example
shows RSTP configured on logical interfaces.