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Precision Timing Protocol (PTP) on ACX Series Universal Access Routers
Precision Timing Protocol (PTP) also known as IEEE 1588v2 synchronizes clocks between nodes in a network, thereby enabling the distribution of an accurate clock over a packet-switched network. This synchronization is achieved through packets that are transmitted and received in a session between a master clock and a slave clock. The master clock is external to the ACX Series router, for example, a Brilliant Grand Master or an MX Series router. The slave clock is configured on the ACX Series router.
The following key PTP features are supported:
- Ordinary clock (slave only)—The PTP ordinary slave clock estimates the time offset from the PTP master clock and tries to align its own time and frequency with that of the master. The ACX Series router supports the IEEE 1588v2-compliant ordinary slave clock. To configure a slave clock, include the slave statement and options at the [edit protocols ptp] hierarchy level.
- PTP over User Datagram Protocol (UDP) over IPv4—The IEEE1588v2 standard specifies different transport protocols for carrying PTP packets. For example, PTP over Ethernet, PTP over UDP over IPv4, and PTP over UDP over IPv6. The ACX Series routers support PTP over UDP over IPv4.
- Unicast mode (IPv4 on Gigabit Ethernet interfaces only)—Unicast mode is a user-to-user protocol used to send a datagram to a single recipient. Unicast mode is used for transporting PTP messages. To configure unicast mode on an interface, include the unicast-mode statement at the [edit protocols ptp slave interface interface-name] hierarchy level.
