Nokia 7210 Configuration Manual page 294

System Management
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.
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).
The following guidelines must be considered for transparent PTP packet forwarding.
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• 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.
• On 7210 SAS-Mxp, 7210 SAS-T, 7210 SAS-R6, 7210 SAS-R12,
7210 SAS-Sx 10/100GE, and 7210 SAS-Sx 1/10GE, if the ptp-hw-timestamp
command is enabled by executing the command on a set of ports, the node
processes PTP packets that transit those ports to update the correction field for
the packet residence time in the node. This allows for accurate computation by
PTP time and frequency recovery algorithms on PTP slave clocks that are
connected to those ports.
• The command to enable PTP hardware timestamps for packets transiting the
node should be configured on both the ingress and egress port where PTP
packets are expected to be received and sent from (and where they need to be
processed to update correction time). Configuring the PTP hardware timestamp
command on only the ingress port or egress port is not recommended because
this will result in incorrect updates to the correction field.
• For 7210 SAS-R6 and 7210 SAS-R12 platforms with IMM-b (IMMv2) and IMM-
c cards, and for the 7210 SAS-Mxp and 7210 SAS-Sx 1/10GE, to enable
transparent forwarding of PTP packets over MPLS tunnels, PTP hardware port-
based timestamping must be disabled on the access ports where SAPs are
configured. These access ports are used to connect to either PTP master or PTP
slaves that need to establish and exchange PTP messages transparently. PTP
hardware port-based timestamping does not need to be disabled on the network
ports where the MPLS tunnels originate and terminate. This means that these
network ports can be used for PTP packet exchange when the node is a PTP
boundary clock or ordinary clock slave. If the requirement is to forward PTP
packets transparently when MPLS uplinks are not used or when a hybrid port
with a SAP is used, PTP hardware port-based timestamping must be disabled
on the access port and hybrid port.
Use subject to Terms available at: www.nokia.com
7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
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Configuration Guide
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