7210 SAS-MXP, R6, R12, S, SX, T BASIC SYSTEM
CONFIGURATION GUIDE RELEASE 22.9.R1
System management
• PTP timeReceiver capability is available on all the ports 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.
• When changing the clock-type to or from a boundary clock 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 platforms, the node must be rebooted for the change to take effect. Nokia recommends taking
appropriate measures to minimize service disruption during the reboot process.
• The 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx 1/10GE, and 7210 SAS-T support
the use of PTP and SyncE as a reference simultaneously. That is, on these 7210 SAS platforms, the
ref-order can be set to config>system>sync-if-timing>ref-order ref1 ref2 ptp.
• 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 support the PTP hybrid mode of operation. Frequency recovery
is provided by the central clock through either SyncE or BITS, depending on which reference is
configured. PTP is used for time recovery only. In this mode, the node can recover very stable
frequency using a reduced PTP packet rate.
• To enable PTP hybrid mode on the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx
1/10GE, and 7210 SAS-T, run the config>system>ptp>clock>freq-source ssu CLI command. To
enable pure PTP mode, the user must run the command config>system>ptp>clock>freq-source ptp.
For a change of value from ssu to ptp (or vice-versa) to take effect, the operator must save the
configuration changes and reboot the node.
• On the 7210 SAS-R6 and 7210 SAS-R12, only the BITS1 port can be used to provide a reference to the
system clock or to distribute the reference. The use of the BITS2 port is not supported.
• On the 7210 SAS-T and 7210 SAS-Mxp, both the BITS1 and BITS2 ports can be used to provide a
reference to the system clock or to distribute the reference.
• On the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx 1/10GE, and 7210 SAS-T, an IP
address must be configured under config>system>security>source-address>application ptp before
PTP can be enabled for use. The use of the system IPv4 interface address or other loopback IPv4
interface address is recommended for PTP applications. The IPv4 address of an IPv4 interface over a
port can also be used. The PTP software uses the configured IP address as the source IP address for
both configured peers and discovered peers.
• On the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, and 7210 SAS-T, 1 pps and 10 MHz interface
signals should only be used when PTP is enabled. Use these signals only after determining that the
system is configured to use PTP as a reference and is locked to PTP.
• The 7210 SAS-S 1/10GE does not support IEEE 1588v2 PTP.
• 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, PTP port-based timestamping is enabled by default on all ports
for all PTP packets at system bootup:
– When this feature is enabled, PTP packets are not forwarded transparently through the node,
regardless of the service used and whether PTP is configured as a system clock reference. To
enable transparent forwarding, see PTP message transparent forwarding.
– Regardless of whether PTP is enabled (configure>sync-if-timing>ptp>no shutdown) or disabled
(configure>sync-if-timing>ptp>shutdown), the timestamp value stored in the correction-field (CF)
is updated for all PTP packets that are in transit through the node. This affects all PTP packets that
are not originated or terminated on the node.
To prevent this occurrence, disable PTP port-based hardware timestamps on specific (all or select)
ports by configuring the configure>port>no ptp-hw-timestamp CLI command on ports where
3HE 18197 AAAB TQZZA
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