Figure 43: L2Pt Topology - Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual

Chapter 64: Examples: Bridging and VLAN Configuration

Figure 43: L2PT Topology

When you enable L2PT on a VLAN, Q-in-Q tunneling is also (and must be) enabled.
Q-in-Q tunneling ensures that Switches A, B, C, D, E, and F are part of the same broadcast
domain.
This example uses STP as the Layer 2 protocol being tunneled, but you could substitute
any of the supported protocols for STP. You can also use the all keyword to enable L2PT
for all supported Layer 2 protocols.
Tunneled Layer 2 PDUs do not normally arrive at high rate. If the tunneled Layer 2 PDUs
do arrive at high rate, there might be a problem in the network. Typically, you would want
to shut down the interface that is receiving a high rate of tunneled Layer 2 PDUs so that
problem can be isolated. However, if you do not want to completely shut down the
interface, you can configure the switch to drop tunneled Layer 2 PDUs that exceed a
certain threshold.
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