Cisco IE-3000-8TC Software Configuration Manual page 157

Chapter 8 Administering the Switch
The switch can send or receive NTP broadcast packets on an interface-by-interface basis if there is an
NTP broadcast server, such as a router, broadcasting time information on the network. The switch can
send NTP broadcast packets to a peer so that the peer can synchronize to it. The switch can also receive
NTP broadcast packets to synchronize its own clock. This section provides procedures for both sending
and receiving NTP broadcast packets.
Beginning in privileged EXEC mode, follow these steps to configure the switch to send NTP broadcast
packets to peers so that they can synchronize their clock to the switch:
Command
Step 1
configure terminal
Step 2 interface interface-id
Step 3 ntp broadcast [version number] [key keyid]
[destination-address]
Step 4 end
Step 5 show running-config
Step 6 copy running-config startup-config
Step 7
To disable the interface from sending NTP broadcast packets, use the no ntp broadcast interface
configuration command.
This example shows how to configure a port to send NTP Version 2 packets:
Switch(config)# interface gigabitethernet1/1
Switch(config-if)# ntp broadcast version 2
Beginning in privileged EXEC mode, follow these steps to configure the switch to receive NTP
broadcast packets from connected peers:
Command
Step 1
configure terminal
Step 2 interface interface-id
Step 3 ntp broadcast client
Step 4 exit
OL-13018-03
Purpose
Enter global configuration mode.
Specify the interface to send NTP broadcast packets, and enter
interface configuration mode.
Enable the interface to send NTP broadcast packets to a peer.
By default, this feature is disabled on all interfaces.
(Optional) For number, specify the NTP version number. The
•
range is 1 to 3. If you do not specify a version, Version 3 is used.
(Optional) For keyid, specify the authentication key to use when
•
sending packets to the peer.
(Optional) For destination-address, specify the IP address of the
•
peer that is synchronizing its clock to this switch.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Configure the connected peers to receive NTP broadcast packets as
described in the next procedure.
Purpose
Enter global configuration mode.
Specify the interface to receive NTP broadcast packets, and enter
interface configuration mode.
Enable the interface to receive NTP broadcast packets.
By default, no interfaces receive NTP broadcast packets.
Return to global configuration mode.
Cisco IE 3000 Switch Software Configuration Guide
Managing the System Time and Date
8-7