Cisco Systems SMC-169 manual SMC-174

Implementing NTP on Cisco IOS XR Software

How to Implement NTP on Cisco IOS XR Software

When a networking device is operating in the broadcastclient mode, it does not engage in any polling. Instead, it listens for NTP broadcast packets transmitted by broadcast time servers. Consequently, time accuracy can be marginally reduced, because time information flows only one way.

Use the broadcast client command to set your networking device to listen for NTP broadcast packets propagated through a network. For broadcastclient mode to work, the broadcast server and its clients must be located on the same subnet. The time server that is transmitting NTP broadcast packets must be enabled on the interface of the given device using the broadcast command.

SUMMARY STEPS

1.configure

2.ntp

3.broadcastdelay microseconds

4.interface type instance

5.broadcast client

6.broadcast [destination ip-address] [key key-id] [version number]

7.end or commit

DETAILED STEPS

	Command or Action		Purpose
Step 1
	configure		Enters global configuration mode.
	Example:
	RP/0/RP0/CPU0:router# configure
Step 2
	ntp		Enters NTP configuration mode.
	Example:
	RP/0/RP0/CPU0:router(config)# ntp
Step 3
	broadcastdelay microseconds		Adjusts the estimated round-trip delay for NTP broadcasts.
	Example:
	RP/0/RP0/CPU0:router(config-ntp)#
	broadcastdelay 5000
Step 4
	interface type instance		Enters NTP interface configuration mode.
	Example:
	RP/0/RP0/CPU0:router(config-ntp)# interface POS
	0/1/0/0
Step 5
	broadcast client		Configures the specified interface to receive NTP broadcast
			packets.
	Example:
	RP/0/RP0/CPU0:(config-ntp-int)# broadcast
	client
		Cisco IOS XR System Management Configuration Guide

SMC-174