Nokia 7210 SAS-M User Manual

System Management
292
7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
3HE 16132 AAAB TQZZA Edition: 01
6.5.8.4 PTP Message Transparent Forwarding
On bootup, port-based hardware timestamping is enabled by default on all ports on
the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx 1/10GE, and
7210 SAS-T, and the node processes both transit packets and locally destined PTP
packets. Use the ptp-hw-timestamp command to disable port-based hardware
timestamping in the following cases:
• to allow the node to transparently forward PTP packets when MPLS uplinks are
used
• when PTP is enabled and used to synchronize and time the node (that is, PTP
messages are originated and terminated by the node acting as a PTP OC-slave
or BC)
• on ports that receive PTP packets that will be forwarded transparently
When PTP port-based hardware timestamp is disabled, the node does not update
the correction field in PTP messages. Refer to the 7210 SAS-M, T, R6, R12, Mxp,
Sx, S Interface Configuration Guide for more information about the ptp-hw-
timestamping command.
For example, to enable transparent forwarding of PTP packets over MPLS tunnels,
when access ports with configured SAPs are used to connect the PTP master or PTP
slaves, the ptp-hw-timestamp command can be used to disable PTP port-based
hardware timestamping on these access ports.
The following guidelines must be considered for transparent PTP packet forwarding.
• By default, PTP port-based hardware timestamping is enabled on all ports at
bootup. To allow transparent PTP packet forwarding, the feature must be
disabled using the configure>port>no ptp-hw-timestamp command.
Note: When PTP is enabled on the 7210 SAS-M (operating in both network mode and
access-uplink mode) for node synchronization, port-based hardware timestamping is
enabled on all ports by default, and only locally-destined PTP packets are processed by the
node. PTP IP/UDP messages that are not addressed to the node are forwarded
transparently without additional configuration.
Note: The ptp-hw-timestamp command is only supported on the 7210 SAS-T,
7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, 7210 SAS-Sx 1/10GE, and
7210 SAS-Sx 10/100GE. Port-based hardware timestamping can be used for transparent
PTP packet forwarding if PTP is enabled and used to time the node (that is, PTP messages
are originated and terminated by the node acting as a PTP OC-slave or BC).

Nokia 7210 SAS-M Specifications

General

Brand	Nokia
Model	7210 SAS-M
Category	Cell Phone
Language	English