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clocking (external [interface interface-name ] | internal);

Hierarchy Level

[edit interfaces interface-name]

Release Information

Statement introduced before JUNOS Release 7.4.

interface option added in JUNOS Release 8.2.


For interfaces that can use various clock sources, configure the source of the transmit clock on each interface.


external—The clock source is provided by the data communication equipment (DCE).

interface interface-name—For interfaces operating on T1/E1 PIMs for J Series Services Routers only, configure clocking for the drop-and insert feature. When configuring this feature, both ports must use the same clock source: either the router’s internal clock or an external clock on one of the interfaces. If an external clock source is required, one interface must specify clocking external and the other must specify the same clock.

internal—Use the internal stratum 3 clock as the reference clock.

Default: internal

Required Privilege Level

interface—To view this statement in the configuration.

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

Published: 2010-04-20

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