Nokia 7210 SAS-M User Manual

7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide
System Management
Edition: 01 3HE 16132 AAAB TQZZA 291
• 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.
- 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.

Nokia 7210 SAS-M Specifications

General

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