Dell MX9116n EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 166

Supported Releases broadcastdelay: authdelay: 0.000000 s 0.000000 s OS10# show ntp status vrf management system peer: 1.1.1.2 system peer mode: client leap indicator: 00 stratum: 4 precision: -23 root distance: 0.00027 s root dispersion: 0.94948 s reference ID: [1.1.1.2] reference time: ddc78084.f17ea38b system flags: ntp kernel stats jitter: 0.000000 s stability: 0.000 ppm broadcastdelay: 0.000000 s authdelay: 0.000000 s OS10# Tue, Nov 28 2017 6:28:20.943 OS10# show ntp status vrf red associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer, system peer: 11.0.0.2:123 system peer mode: client leap indicator: 00 stratum: 10 log2 precision: -24 root delay: 0.338 root dispersion: 1136.790 reference ID: 11.0.0.2 reference time: dbc7a951.f7978096 Sat, Nov 5 2016 0:41:53.967 system jitter: 0.000000 clock jitter: 0.003 clock wander: 0.001 broadcast delay: -50.000 symm. auth. delay: 0.000 10.2.0E or later Precision Time Protocol Precision Time Protocol (PTP), defined in the IEEE1588-2008 standard, is a protocol that uses a master-slave hierarchy to synchronize clocks on network devices. PTP uses hardware time stamping to achieve submicrosecond synchronization. PTP defines how real-time clocks in a network synchronize with each other. A network where PTP operates is called a PTP domain. This protocol operates by organizing clocks within a PTP domain into a master-slave hierarchy. The reference time for the entire system comes from the root clock, also known as the grandmaster clock. PTP is more accurate than NTP because it uses hardware timestamping. PTP also accounts for device latency while synchronizing time. NTP synchronizes clocks with millisecond accuracy; PTP achieves submicrosecond accuracy. OS10 supports PTP on all platforms that support hardware time stamping. PTP-enabled devices consist of the following clock types: Ordinary clock A device with a single physical port is called an ordinary clock. This device could take on a master or slave clock role. NOTE: OS10 switch cannot function as the grandmaster clock and hence OS10 does not support the ordinary clock configuration. Boundary clock A device with multiple physical ports that synchronizes time from one network segment to another is called a boundary clock. One port is a slave that synchronizes time from upstream PTP device. The other ports are masters that distribute time to downstream devices. The best master clock algorithm (BMCA) decides the individual state of a port, master or slave. 166 System management