ECS4660-28F_Management Guide-R03

C HAPTER 14 | Basic Administration Protocols
PTP Configuration
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IPv6 UDP – PTP messages are transmitted using UDP over IPv6.
When using UDP over IPv6 as a transport mechanism, the following
UDP destination ports are reserved values assigned to PTP.
When using UDP over IPv6 as a transport mechanism, PTP
messages use the multicast addresses as specified below.
◆ Log Sync Interval – Sets the minimum interval between the
transmission of (multicast) synchronization messages. (Range: -1 - 1 in
log base 2; Default: 0)
The log base 2 settings equate to the following values:
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- 1 – 1 packet every 1/2 second
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0 – 1 packet every second
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1 – 1 packet every 2 seconds
Synchronization messages are used to synchronize clocks within the
same PTP domain. A boundary or transparent clock in slave state will
synchronize to its master in the synchronization hierarchy established
by the best master clock algorithm.
◆ Log Announce Interval – Sets the PTP announcement message
transmit interval. (Range: 0-4 in log base 2)
The log base 2 settings equate to the following values:
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0 – 1 packet every second
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1 – 1 packet every 2 seconds
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2 – 1 packet every 4 seconds
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3 – 1 packet every 8 seconds
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4 – 1 packet every 16 seconds
It may be necessary for the announcement interval to be different in
networks which employ different communication technologies, such as
wired or wireless. Systems where the announcement interval varies
from region to region will still function correctly. However, regions with
short intervals may experience more reconfiguration events while
waiting for slower regions to select master clocks.
Table 43: UDP/IPv6 Destination Port Numbers
Message Types UDP Port Number
Event message 319
Multicast general message 320
Unicast general message addressed to a clock 320
Table 44: UDP/IPv6 Multicast Addresses
Message Types Address
All except peer delay mechanism messages FF0X:0:0:0:0:0:0:183
Peer delay mechanism messages FF02:0:0:0:0:0:0:6B