Nokia 7210 Configuration Manual page 292

System Management
A CLI option is provided to enable the PTP port-based hardware timestamp on ports
that receive and forward PTP messages. To enable the TC function, PTP must not
be enabled on the node. When the timestamp option is enabled, the node identifies
standards-based messages and updates the CF for PTP IP/UDP multicast and
unicast messages, and for the PTP Ethernet multicast and unicast messages. The
CF is updated for the residence time of the PTP message. Downstream PTP slaves
that receive the PTP message use the updated CF to measure the delay between
the master and themselves.
You can enable the TC option by running the configure>port>ethernet>ptp-hw-
timestamp command on ports (both ingress and egress) on which residence time in
the PTP message must be updated when the message is in transit through the node.
You can disable the residence time update by running the no form of the command
on both ingress and egress ports, as required. No additional CLI commands are
required to enable the PTP TC option.
Nokia recommends the following operational guidelines and examples for enabling
and using the PTP TC feature.
292
• Assume port 1/1/10 is connected to a PTP master clock (using a port, a SAP, or
an IES IP interface) and 1/1/15 is connected to a PTP slave clock (using a port,
a SAP, or an IES IP interface).
To enable PTP TC in this scenario, you must enable the ptp-hw-timestamp
command on both ports. To disable PTP TC, run the no form of the command
on both ports.
• Assume port 1/1/10 is connected to a PTP master clock (using a port, a SAP, or
an IES IP interface) and ports 1/1/15 and 1/1/16 have PTP slaves (using a port,
a SAP, or an IES IP interface), with a PTP session to the PTP master clock that
is connected on port 1/1/10.
To enable PTP TC, the ptp-hw-timestamp command must be enabled on all
three ports.
In this scenario, it is not possible to disable PTP TC only towards the slave
connected on port 1/1/15. The functionality must be disabled on all three ports.
Additionally, note that the PTP messages coming in on port 1/1/10 are not
forwarded out of any ports other than 1/1/15 and 1/1/16, when the ptp-hw-
timestamp command is enabled on port 1/1/10. Nokia recommends that when
a set of PTP ports are enabled for ptp-hw-timestamp, the operator must ensure
that PTP messages are forwarded to only the specific set of ports where the TC
option is enabled, and not to other ports. Forwarding PTP messages to other
ports that do not belong to the specific set may result in incorrect updates.
• You can enable PTP TC for a set of SAPs and also transparently forward PTP
packets on other SAPs, while both SAPs share a common uplink to forward PTP
messages. To implement this scenario, use MPLS tunnels with network ports as
the uplinks. Nokia recommends the following configuration.
Use subject to Terms available at: www.nokia.com
7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
© 2021 Nokia.
Configuration Guide
3HE 17358 AAAB TQZZA