Chapter 36: Clock Synchronization Protocol
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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Configure NTP Client
The purpose of the procedure that follows is to configure the C4/c CMTS as an NTP client. This means that the C4/c CMTS
clock is synchronized to the NTP server.
To Configure the NTP Client
Perform the following steps:
Note: PacketCable requires the use of NTP for network synchronization. Use step 1 if the NTP client is unicast; otherwise,
go to step 2.
For NTP to synchronize properly, the current time of the internal clock must be manually set to within 1000 seconds of the
actual time before the NTP server is enabled. (See RFC 1305.) See
1.
Configure the NTP client:
configure ntp server <ipv4 addr> [broadcast] [burst] [key] [manycast] [maxpoll <4-11>] [minpoll
<4-11>] [multicast] [prefer] [version <2-4>]
Here are some of the pertinent defaults:
burst mode
=
off
key
=
0
minpoll =
6
maxpoll =
7
version =
4
2.
Use one of the following commands to configure the C4/c CMTS as an NTP client listening to a broadcast or multicast
server, or if is to be part of an NTP manycast group:
configure ntp server <ipv4 addr> broadcast
configure ntp server <ipv4 addr> multicast
configure ntp server <ipv4 addr> manycast
3.
Set the NTP re-synchronization timer:
configure ntp minpoll <4..11>
configure ntp maxpoll <4..11>
Where
4-11 are exponents of 2. In other words, the possible values are 2
4,
2
5
,2
6
...2
11
, which equal 15,32,64 ... 2048
These commands are used to set the default values for NTP minpoll, maxpoll, and version parameters that will be
assumed by subsequent configure ntp server | peer commands. The defaults are: