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Hierarchy Level


Configure Layer 2 control protocols to enable features such as Layer 2 protocol tunneling or nonstop bridging.

You can configure destination MAC address using tunnel-destination-mac <destination mac address>.


For a detailed description of configuring the nonstop-bridging statement, see the Junos OS High Availability User Guide. When you configure this statement on routing platforms with two Routing Engines, a primary Routing Engine switches over gracefully to a backup Routing Engine and preserves Layer 2 Control Protocol (L2CP) information.


ephemeral-db-support (Junos OS only) Enable users to configure Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), or VLAN Spanning Tree Protocol (VSTP) in the ephemeral configuration database.

The remaining statements are explained separately. Search for a statement in CLI Explorer or click a linked statement in the Syntax section for details.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 8.4.

bpdu-block statement added in Junos OS Release 9.4.

enable-all-if statement added in Junos OS Release 13.3.

Statement introduced in Junos OS Release 14.1X53-D10 for EX4300 switches.

tunnel-destination-mac statement added in Junos OS Evolved Release 21.3R1.

ephemeral-db-support statement added in Junos OS Release 23.4R1.