Nokia 7210 SAS-Mxp - Page 270

7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
includes a localPriority parameter, and includes the ability to force a port to never enter the timeReceiver
state (master-only). The precedence is as follows:
• clock class
• clock accuracy
• PTP variance (offsetScaledLogVariance)
• priority2
• localPriority
• clock identity
• steps removed from the grandmaster
The 7210 SAS sets its local parameters as described in the following table.
Table 36: Local clock parameters when profile is set to g8275dot1-2014
Parameter Value
clockClass 165 – the 7210 SAS is configured as a boundary clock and
the boundary clock was previously locked to a grandmaster
with clock class of 6
248 – the 7210 SAS is configured as a boundary clock
255 – the 7210 SAS is configured as an ordinary clock time
Receiver
clockAccuracy FE – unknown
offsetScaledLogVariance FFFF – not computed
clockIdentity Chassis MAC address following the guidelines of section
7.5.2.2.2 of IEEE 1588-2008
The 7210 SAS supports a limited number of configured (possible timeTransmitter or neighbor boundary
clocks) and a discovered peers (timeReceivers).These peers use the unicast negotiation procedures
to request service from the 7210 SAS clock. A neighbor boundary clock counts as two peers (both a
configured and a discovered peer) toward the maximum limit.
The number of configured Ethernet ports is not restricted.
On the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx 1/10GE, 7210 SAS-Sx 10/100GE
64SFP+ 4QSFP28, and 7210 SAS-T, there are limits on the number of timeReceivers enforced in the
implementation for unicast and multicast timeReceivers.
Note:
Contact a Nokia technical support representative for scaling information about specific unicast
message limits related to PTP.
The following figure shows the unicast negotiation procedure performed between a timeReceiver and
a timeTransmitter clock that is selected to be the timeReceiver clock. The timeReceiver clock requests
Announce messages from all peer clocks, but only requests Sync and Delay_Resp messages from the
clock selected to be the timeTransmitter clock.
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