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Hierarchy Level


For Ethernet interfaces on Modular Port Concentrators (MPCs) in MX Series routers only, delegate the transmission of the continuity check messages (CCMs) to the forwarding ASIC (that is, to the hardware) by enabling inline transmission of CCMs. Inline transmission of CCMs is also known as Inline-KA.

By default, CCMs are transmitted by the CPU of the MPC and not by the hardware. If the duration between transmissions of CCMs is low or if the CCMs for a specific line card scale, we recommend that you enable delegation of the transmission of CCMs to the hardware. By enabling inline transmission of CCMs, you can achieve maximum scaling of CCMs.


Starting in Junos OS Release 16.1R1, the inline support for 1s interval is supported on MPC1 to MPC7 (except MPC3 and MPC4) line cards.


Inline transmission is disabled by default.



Enable inline transmission of CCMs.


Inline transmission of CCMs is not enabled when there is a CFM session already established. To enable inline transmission, you must first deactivate the CFM session using the deactivate command and then reactivate the CFM session using the activate command.


Disable inline transmission of CCMs.


After disabling inline transmission of CCMs, you must reboot the router for the changes to take effect.

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 14.2R1.