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multicast-mode (PTP Master and Slave Interfaces)


List of Syntax

MX Series

QFX Series

MX Series

QFX Series

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 15.2 for MX Series routers.

Statement introduced in Junos OS Release 17.4 for the QFX Series.


Configure multicast transmission of Precision Time Protocol (PTP) packets between the master node and the slave node. The multicast method of transport of PTP packets is applicable in environments in which PTP uses IEEE 802.3 or Ethernet encapsulation for the transmission of PTP packets. Because PTP over Ethernet uses multicast addresses, a slave port can automatically start receiving the multicast announce messages transmitted by the master ports on a network and can also start communicating with the master port with minimal or no configuration. Unlike PTP over IPv4 where IP addresses are used to identify the master and slave ports, with PTP over Ethernet, multicast MAC addresses are used in forwarding of PTP traffic.

On the QFX Series, multicast-mode specifies that PTP should be forwarded with the multicast IPv4 packet format, and is required for the enterprise profile.


You can configure only multicast mode or only unicast mode of transmission of PTP traffic on an interface at a point in time.

The remaining statements are explained separately. See CLI Explorer.

Required Privilege Level

routing—To view this statement in the configuration.

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