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| Basic Administration Protocols
C
14
HAPTER
PTP Configuration
IPv6 UDP – PTP messages are transmitted using UDP over IPv6.
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When using UDP over IPv6 as a transport mechanism, the following
UDP destination ports are reserved values assigned to PTP.
Table 43: UDP/IPv6 Destination Port Numbers
Message Types
Event message
Multicast general message
Unicast general message addressed to a clock
When using UDP over IPv6 as a transport mechanism, PTP
messages use the multicast addresses as specified below.
Table 44: UDP/IPv6 Multicast Addresses
Message Types
All except peer delay mechanism messages
Peer delay mechanism messages
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:
- 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
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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:
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
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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.
– 600 –
UDP Port Number
319
320
320
Address
FF0X:0:0:0:0:0:0:183
FF02:0:0:0:0:0:0:6B
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