When VUE is used as an auxiliary video core
in a Distributed Access Architecture Precision Time Protocol (PTP) must be used to sync
the VUE with the primary core (the CMTS), the Remote Phy Device (RPD)/Remote MAC-PHY
Devices (RMDs) and the IEEE 1588 grandmaster clock.NOTE: PTP service must be manually
configured and started on every VUE server in a DAA deployment. During installation,
the PTP service is deployed and started with a sample configuration. Modify the
configuration and restart the service.
Be sure to check the software
capabilities to support PTP using ethtool and
parameters that support time stamping.
Configure PTP section
- Disable NTP on every VUE server
using PTP.
$ sudo systemctl stop chronyd
$ sudo systemctl disable chronyd
- Configure PTP by editing the /var/opt/vue-server/ptp/linuxPtp.conf file on each VUE server. The key parameters to configure are:
- Network transport protocol (UDPv6 or UDPv4)
- IP address(es) of the IEEE 1588 grandmaster clock
- Network interface (eth1, eth2, and so on)
- Verify PTP service status.
$ cat /var/opt/vue-server/ptp/linuxPtp.status
To monitor PTP service continuously in real time, use the watch cat /var/opt/vue-server/ptp/linuxPtp.status command.
