The MIB module for PTP version 2
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Relating to IETF Documents
Overview of PTP version 2 (IEEE Std. 1588-2008)
[IEEE-1588-2008] defines a protocol enabling precise
synchronization of clocks in measurement and control systems
implemented with packet-based networks, the Precision Time
Protocol version 2 (PTPv2). This MIB module does not address
PTPv1, the earlier version defined in IEEE Std. 1588-2002.
The protocol is applicable to network elements communicating
using IP. The protocol enables heterogeneous systems that
include clocks of various inherent precision, resolution, and
stability to synchronize to a grandmaster clock.
The protocol supports system-wide synchronization accuracy in
the sub-microsecond range with minimal network and local clock
computing resources. [IEEE-1588-2008] uses UDP/IP or
Ethernet and can be adapted to other mappings. It includes
formal mechanisms for message extensions, higher sampling rates,
correction for asymmetry, a clock type to reduce error
accumulation in large topologies, and specifications on how to
incorporate the resulting additional data into the
synchronization protocol. [IEEE-1588-2008] also defines
conformance and management capability.
This MIB module supports the Precision Time Protocol version 2
(PTPv2, hereafter designated as PTP) features of network element
system devices, when using the default PTP profile described in
[IEEE-1588-2008] when running over the IP network layer.
It is envisioned that this MIB module will complement other
managed objects to be defined to monitor and measure the
performance of the PTP devices and telecom clocks supporting
specific PTP profiles.
Some other PTP profiles have their own MIB modules defined as
part of the profile, and this MIB module is not intended to
replace those MIB modules.
Technical terms used in this module are defined in
The MIB module refers to sections of [IEEE-1588-2008].
EUI Extended Unique Identifier
GPS Global Positioning System
IANA Internet Assigned Numbers Authority
IP Internet Protocol
NTP Network Time Protocol (see [RFC5905])
PTP Precision Time Protocol
TAI International Atomic Time
UDP User Datagram Protocol
UTC Coordinated Universal Time
[IEEE-1588-2008] IEEE Standard for A Precision Clock
Synchronization Protocol for Networked Measurement and
Control Systems, IEEE Std. 1588-2008, July 2008.
The below table specifies the object formats of the various
textual conventions used.
Data type mapping Textual Convention SYNTAX
------------------- --------------------- ------------------
5.3.2 TimeInterval PtpClockTimeInterval OCTET
5.3.3 Timestamp PtpClockTimestamp OCTET STRING(SIZE(6))
5.3.4 ClockIdentity PtpClockIdentity OCTET STRING(SIZE(8))
5.3.5 PortIdentity PtpClockPortNumber INTEGER(1..65535)
5.3.7 ClockQuality PtpClockQualityClassType