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OSBOLETE: transport 802.3 (PTP Multicast Master and Slave)



Hierarchy Level

Release Information

Statement introduced in Junos OS Release 15.1 for MX Series routers.


Configure Ethernet as the encapsulation type for transport of Precision Time Protocol (PTP) packets. Ethernet encapsulation type is supported for multicast mode of transmission of PTP packets.


The transport statement is mandatory in the configuration of a master or slave clock.


802.3—Enable encapsulation for PTP packet transport in multicast mode.


The link-local statement is not supported on the QFX Series.

link-local—Enable master or slave to choose either of the two MAC addresses defined in the IEEE 1588-2008 standard. When you configure this option, the system attempts to use the 01-80-C2-00-00-0E MAC address (link-local multicast address) for multicast transmission. This address is contained in the Ethernet frame portion of the PTP packet that contains the Destination MAC field and is expected to be flooded by all types of Ethernet bridges and switches and also by a large number of base station vendors. A node with this MAC address can be a node that does not process PTP packets.

If the link-local multicast address is not available, the standard Ethernet multicast address 01-1B-19-00-00-00 address is used as a second priority. The standard Ethernet multicast address, which is a reserved address in the IEEE 802.1Q standard for Ethernet encapsulation that is required to be filtered and not forwarded, is used in the Destination MAC field of the PTP packets. This MAC address is used to ensure complete end-to-end support of PTP, instead of transmission of packets through any network element that does not support PTP. This address is the default address for G.8275.1 (PTP profile for time or phase distribution), and a node with this MAC address is a node that supports processing of PTP packets.

Required Privilege Level

routing—To view this statement in the configuration.

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