transport 802.3 (PTP Multicast Master and Slave)
Syntax transport 802.3 link-local;
Hierarchy Level [edit protocols ptp slave interface interface-name multicast-mode],
[edit protocols ptp master interface interface-name multicast-mode]
Release Information Statement introduced in Junos OS Release 15.1 for MX Series routers.
Description 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.
NOTE: The transport statement is mandatory in the configuration of a master
or slave clock.
Options 802.3—Enable encapsulation for PTP packet transport in multicast mode.
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 01-1B-19-00-00-00 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
01-80-C2-00-00-0E 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.
Related
Documentation
• Configuring Precision Time Protocol
• Example: Configuring Precision Time Protocol
• Precision Time Protocol Overview
Copyright © 2017, Juniper Networks, Inc.1762
ACX Series Universal Access Router Configuration Guide
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