Juniper JUNOS OS 10.3 - SOFTWARE Manual page 1488

Complete Software Guide for Junos
Configuring Layer 2 Protocol Tunneling on EX Series Switches (CLI Procedure)
1392
®
OS for EX Series Ethernet Switches, Release 10.3
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
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 using the
statement.
drop-threshold
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: 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 1293 and "Configuring Q-in-Q Tunneling (CLI
Procedure)" on page 1386.
To configure L2PT on an EX Series switch:
Because L2PT operates under the Q-in-Q tunneling configuration, you must enable
1.
Q-in-Q tunneling before you can configure L2PT. Enable Q-in-Q tunneling on VLAN
customer-1 :
[edit]
user@switch# set vlans customer-1 dot1q-tunneling
Enable L2PT for the Layer 2 protocol you want to tunnel, on the VLAN:
2.
To enable L2PT for a specific protocol (here, STP):
[edit]
user@switch# set vlans customer-1 dot1q-tunneling layer2-protocol-tunneling stp
shutdown-threshold
and
drop-threshold shutdown-threshold
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