The following configuration guidelines and restrictions apply for PTP:
The PTP timeReceiver capability is available on all the ports on the 7210 SAS-D ETR, 7210 SAS-Dxp 12p ETR, 7210 SAS-Dxp 16p, 7210 SAS-Dxp 24p, 7210 SAS-K 2F1C2T, 7210 SAS-K 2F6C4T, and 7210 SAS-K 3SFP+ 8C.
The 7210 SAS-D ETR, 7210 SAS-Dxp 12p ETR, 7210 SAS-Dxp 16p, 7210 SAS-Dxp 24p, 7210 SAS-K 2F1C2T, 7210 SAS-K 2F6C4T, and 7210 SAS-K 3SFP+ 8C use CPU processing cycles for frequency and time recovery.
On the 7210 SAS-D ETR, 7210 SAS-Dxp 12p ETR, 7210 SAS-Dxp 16p, and 7210 SAS-Dxp 24p, Nokia highly recommends that PTP be used only in hybrid mode. Hybrid mode allows users to use reduced PTP packet rates and to scale better while using syncE for frequency reference.
On the 7210 SAS-D ETR, use of both PTP and SyncE as a reference simultaneously is not allowed. Either PTP or SyncE can be configured as a reference but not both at the same time.
On 7210 SAS devices, only a single profile (IEEE 1588v2, G.8265.1, or G.8275.1), IEC/IEEE 61850-9-3-2016, or C37.238-2017 can be enabled for all PTP communications (both toward its timeTransmitter and timeReceivers connected to it) at a time.
The PTP G.8275.1 profile is only supported on the 7210 SAS-Dxp 12p ETR, 7210 SAS-K 2F6C4T, and 7210 SAS-K 3SFP+ 8C. The following restrictions apply to the use of the G.8275.1 PTP profile:
The delay and sync requests are set to 16 pps by default and are not configurable.
The announce rate is set to 8 pps by default and is not configurable.
A change of profile to G.8275.1 or from G.8275.1 to another profile requires a reboot of the node.
Only a single multicast timeReceiver is supported per port.
PTP with Ethernet encapsulation is only supported with the G.8275.1 profile, IEC/IEEE 61850-9-3, and C37.238-2017 profiles.
PTP over IP encapsulation is not supported with the G.8275.1, IEC/IEEE 61850-9-3, and C37.238-2017 profiles. It is only supported with the IEEE 1588v2 and G.8265.1 profiles.
When changing the clock-type to or from a boundary clock on the 7210 SAS-K 2F1C2T, 7210 SAS-K 2F6C4T, and 7210 SAS-K 3SFP+ 8C, the node must be rebooted for the change to take effect. Ensure that measures are taken to minimize service disruption during the reboot process.
On the 7210 SAS-K 2F6C4T and 7210 SAS-K 3SFP+ 8C, to enable PTP hybrid mode when using the IEEE profile, the user must execute the command config>system>ptp>clock>freq-source ssu. To enable pure PTP mode, the user must execute the command config>system>ptp>clock>freq-source ptp. A change of value from ssu to ptp, or the other way around, requires a reboot of the node after the configuration changes are saved for the change to take effect.
On the 7210 SAS-Dxp 12p ETR, 7210 SAS-K 2F6C4T, and 7210 SAS-K 3SFP+ 8C, when the profile is set to G8275.1, the software automatically sets the freq-source to ssu. The user is not required to explicitly configure this setting.
On the 7210 SAS-D ETR, port-based timestamping is enabled for all PTP packets by default when PTP is enabled.
When PTP 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. If PTP is enabled, to enable transparent PTP forwarding again, disable PTP, save the configuration, and reboot the node.
On the 7210 SAS-Dxp 12p ETR, 7210 SAS-Dxp 16p, and 7210 SAS-Dxp 24p, port-based timestamping is disabled for all PTP packets by default. To enable PTP port-based timestamps, the user must explicitly enable PTP timestamping on the required ports.
When PTP 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. If PTP is enabled, to enable transparent PTP forwarding again, disable PTP port-based timestamping for the applicable ports.
On the 7210 SAS-K 2F1C2T, 7210 SAS-K 2F6C4T, and 7210 SAS-K 3SFP+ 8C, port-based timestamping is enabled for all PTP packets by default:
When port-based timestamping is enabled on all ports, 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 PTP forwarding, disable port-based timestamping on the port.
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.
See PTP message transparent forwarding for more information about enabling transparent forwarding.