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Chapter 36: Clock Synchronization Protocol

STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide

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 Setting the Internal Clock (page 984).

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

...2

, 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:

Arris C4C User Manual

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