Figure 1: Network Topology For Rstp - Juniper EX9200 Features Manual

Spanning-Tree Protocols Feature Guide for EX9200 Switches
Overview and Topology
10
Before you configure the switches for RSTP, be sure you have:
Installed and connected the four switches. See the hardware documentation for your
switch.
Performed the initial software configuration on all switches. See Connecting and
Configuring an EX Series Switch (CLI Procedure) or Connecting and Configuring an EX
Series Switch (J-Web Procedure).
RSTP works by identifying certain links as point to point links and blocking other possible
paths. When one of the point-to-point links fails, a designated alternate link transitions
to the forwarding state and take over. Configuring nonstop bridging (NSB) on a switch
with redundant Routing Engines keeps RSTP synchronized on both Routing Engines. This
way, RSTP remains active immediately after a switchover because it is already
synchronized to the backup Routing Engine. RSTP does not have to reconverge after a
Routing Engine switchover when NSB is enabled because the neighbor devices do not
detect an RSTP change on the switch. In this example, four EX Series switches are
connected in the topology displayed in
with NSB applied to switches with dual Routing Engines.

Figure 1: Network Topology for RSTP

Table 4 on page 11 shows the components of the topology for this example.
Figure 1 on page 10 to create a loop-free topology
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