Juniper JUNOS OS 10.4 - FOR EX REV 1 Manual page 1718

Complete Software Guide for Junos
Configuring Layer 2 Protocol Tunneling on EX Series Switches (CLI Procedure)
1614
®
OS for EX Series Ethernet Switches, Release 10.4
Layer 2 protocol tunneling (L2PT) allows you to send Layer 2 protocol data units (PDUs)
across a service provider network and deliver them to EX Series switches at a remote
location. This feature is useful when you have a network that includes remote sites that
are connected across a service provider network and you want to run Layer 2 protocols
on switches connected across the service provider network.
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
the problem can be isolated. You do so using the
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 using the
statement.
There are no default settings for
specify these thresholds, then no thresholds are enforced. As a result, the switch tunnels
all Layer 2 PDUs regardless of the speed at which they are received, although the number
of packets tunneled per second might be limited by other factors.
You can specify a drop threshold value without specifying a shutdown threshold value,
and you can specify a shutdown threshold value without specifying a drop threshold
value. If you specify both threshold values, then the drop threshold value must be less
than or equal to the shutdown threshold value. If the drop threshold value is greater than
the shutdown threshold value and you try to commit the configuration, the commit will
fail.
NOTE: L2PT and VLAN translation configured with the mapping statement
cannot both be configured on the same switch.
NOTE: If the switch receives untagged Layer 2 control PDUs to be tunnelled,
then you must configure the switch to map untagged (native) packets to an
L2PT-enabled VLAN. Otherwise, the untagged Layer 2 control PDU packets
are discarded. For more information, see "Understanding Q-in-Q Tunneling
on EX Series Switches" on page 1514 and "Configuring Q-in-Q Tunneling (CLI
Procedure)" on page 1608.
shutdown-threshold
and
drop-threshold shutdown-threshold
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statement. However,
drop-threshold
. If you do not