System Management
250
Basic System Configuration Guide
3HE 11010 AAAC TQZZA Edition: 01
Ethernet encapsulation is configured on a per-port basis using the config>system>
ptp>clock command, with the clock-id parameter set to csm. Ports can
simultaneously support IPv4-encapsulated PTP messages and Ethernet-
encapsulated PTP messages. As well, the 7705 SAR supports the interworking of a
PTP slave using IPv4-encapsulated messages with a PTP master using Ethernet-
encapsulated messages.
Table 29 describes the supported message rates for slave and master states for
Ethernet-encapsulated PTP traffic, based on the profile configured. The ordinary
clock can be either in the slave or master state. The boundary clock can be in both
of these states.
See Table 27 for the supported message rates for IP-encapsulated PTP traffic.
PTP messages are transported within Ethernet frames with the Ethertype set to
0X88F7. Ports can be configured with one of two reserved multicast destination
addresses:
• 01-1B-19-00-00-00 — used for all PTP messages except for peer delay
mechanism messages
• 01-80-C2-00-00-0E — used for peer delay mechanism messages
The ITU-T allows either address to be used depending on customer requirements.
Refer to Recommendation ITU-T G.8275.1/Y.1369.1.
Table 29 Rates for Ethernet-Encapsulated PTP Messages
ieee1588-2008 g8275dot1-2014
Announce Minimum rate 1 per 16 seconds 1 per 16 seconds
Maximum rate 8 per second 8 per second
Default rate 1 per 2 seconds 8 per second
Sync Minimum rate 1 per second 1 per second
Maximum rate 64 per second 64 per second
Default rate 64 per second 16 per second
Delay Minimum rate 1 per second 1 per second
Maximum rate 64 per second 64 per second
Default rate 64 per second 16 per second
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