7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
System Management
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- PTP hardware port-based timestamping must be disabled on the access
ports where SAPs are configured. These access ports are typically used to
connect to either PTP master or PTP slaves that need to establish and
exchange PTP messages transparently.
- PTP hardware port-based timestamping must be enabled on the access
ports where SAPs are configured and the TC function is required. These
access ports are typically used to connect to either the PTP master or PTP
slaves.
- PTP hardware port-based timestamping must be enabled on the network
ports where the MPLS tunnels originate and terminate. In this case, the PTP
TC function updates only the PTP messages that are not MPLS
encapsulated.
- See PTP Message Transparent Forwarding for additional support
information.
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.
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.
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