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ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter4 Configuring System Management Functions
Configuring the Network Time Protocol
Configuring the Network Time Protocol
This section describes configuring the Network Time Protocol (NTP) on the ATM switch router.
To control access to the system NTP services, use the following ntp global configuration commands. To
remove access control to the system’s NTP services, use the no ntp command. See the example
configuration at the end of this section and the Displaying the NTP Configuration, page 4-12 to confirm
the NTP configuration.
To see a list of the NTP commands enter a ? in EXEC configuration mode. The following example shows
the list of commands available for NTP configuration:
Switch(config)# ntp ?
access-group Control NTP access
authenticate Authenticate time sources
authentication-key Authentication key for trusted time sources
broadcastdelay Estimated round-trip delay
clock-period Length of hardware clock tick
master Act as NTP master clock
max-associations Set maximum number of associations
peer Configure NTP peer
server Configure NTP server
source Configure interface for source address
trusted-key Key numbers for trusted time sources
update-calendar Periodically update calendar with NTP time
To control access to the system NTP services, use the following global configuration command:
To enable NTP authentication, perform the following steps in global configuration mode:
To specify that a specific interface should send NTP broadcast packets, perform the following steps,
beginning to global configuration mode:
As NTP compensates for the error in the system clock, it keeps track of the correction factor for this
error. The system automatically saves this value into the system configuration using the
ntp clock-period global configuration command.
Command Purpose
ntp access-group {query-only | serve-only |
serve | peer} access-list-number
Configures an NTP access group.
Command Purpose
Step 1
Switch(config)# ntp authenticate Enables NTP authentication.
Step 2
Switch(config)# ntp authentication-key number
md5 value
Defines an authentication key.
Command Purpose
Step 1
Switch(config)# interface type card/subcard/port
Switch(config-if)#
Selects the physical interface to be configured.
Step 2
Switch(config-if)# ntp broadcast [client |
destination | key | version]
Configures the system to receive NTP broadcast
packets.