Implementing NTP on Cisco IOS XR Software
How to Implement NTP on Cisco IOS XR Software
SMC-174
Cisco IOS XR System Management Configuration Guide
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
Example:
RP/0/RP0/CPU0:router# configure
Enters global configuration mode.
Step 2
ntp
Example:
RP/0/RP0/CPU0:router(config)# ntp
Enters NTP configuration mode.
Step 3
broadcastdelay
microseconds
Example:
RP/0/RP0/CPU0:router(config-ntp)#
broadcastdelay 5000
Adjusts the estimated round-trip delay for NTP broadcasts.
Step 4
interface
type instance
Example:
RP/0/RP0/CPU0:router(config-ntp)# interface POS
0/1/0/0
Enters NTP interface configuration mode.
Step 5
broadcast client
Example:
RP/0/RP0/CPU0:(config-ntp-int)# broadcast
client
Configures the specified interface to receive NTP broadcast
packets.
