Dell PowerConnect J-EX4200-24T Software Manual page 1398

Dell PowerConnect J-Series Ethernet Switch Complete Software Guide for Junos OS
Table 175: Components of the Topology for Configuring Loop Protection on J-EX Series Switches
Property
Switch 1
Switch 2
Switch 3
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continuously circle the looped network. As a switch processes a flood of frames in a
looped network, its resources become depleted and the ultimate result is a network
outage.
CAUTION: An interface can be configured for either loop protection or root
protection, but not for both.
Three J-EX Series switches are displayed in Figure 37 on page 1326. In this example, they
are configured for RSTP and create a loop-free topology. Interface
traffic between Switch 3 and Switch 1; thus, traffic is forwarded through interface
on Switch 2. BPDUs are being sent from the root bridge on Switch 1 to both of these
interfaces.
This example shows how to configure loop protection on interface
it from transitioning from a blocking state to a forwarding state and creating a loop in
the spanning-tree topology.
Figure 37: Network Topology for Loop Protection
Table 175 on page 1326 shows the components that will be configured for loop protection.
Settings
Switch 1 is the root bridge.
Switch 2 has the root port
Switch 3 is connected to Switch 1 through interface
.
ge-0/0/7
ge-0/0/6
ge-0/0/6 is blocking
ge-0/0/7
to prevent
ge-0/0/6
.