Specifications

4-14
System Management Software Configuration Guide for Cisco IE 2000U and Connected Grid Switches
Chapter 4 Administering the Switch
Configuring NTP
To re-enable receipt of NTP packets on an interface, use the no ntp disable interface configuration
command.
EXAMPLE
Switch(config)# interface ethernet 0
Switch(config-if)# ntp disable
Switch(config-if)# end
Configuring the Source IP Address for NTP Packets
When the switch sends an NTP packet, the source IP address is normally set to the address of the
interface through which the NTP packet is sent. Use the ntp source global configuration command when
you want to use a particular source IP address for all NTP packets. The address is taken from the
specified interface. This command is useful if the address on an interface cannot be used as the
destination for reply packets.
BEFORE YOU BEGIN
Review the “Network Time Protocol” section on page 4-2.
DETAILED STEPS
Step 3
no shutdown Enable the port, if necessary. By default, UNIs and enhanced
network interfaces (ENIs) are disabled, and NNIs are enabled.
Step 4
ntp disable Disable NTP packets from being received on the interface.
By default, all interfaces receive NTP packets.
Step 5
end Return to privileged EXEC mode.
Step 6
show running-config Verify your entries.
Step 7
copy running-config
startup-config
(Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ntp source interface type interface
number
Specify the interface type and number from which the IP source
address is taken.
By default, the source address is set by the outgoing interface.
Step 3
end Return to privileged EXEC mode.
Step 4
show running-config Verify your entries.
Step 5
copy running-config
startup-config
(Optional) Save your entries in the configuration file.