Configuring Ntp Broadcast Service - Cisco C3201FESMIC-TP= - 3201 Fast EN Switch Mobile Interface Card Expansion Module Software Configuration Manual

Wireless mic
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Managing the System Time and Date

Configuring NTP Broadcast Service

The communications between devices running NTP (known as associations) are usually statically
configured; each device is given the IP addresses of all the devices with which it should form
associations. Accurate timekeeping is possible by exchanging NTP messages between associated
devices. However, in a LAN environment, NTP can be configured to use IP broadcast messages instead.
This alternative reduces configuration complexity because each device can be configured only to send
broadcast messages or to receive broadcast messages. However, the information flow is one-way only.
The WMIC 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 WMIC can send NTP
broadcast packets to a peer so that the peer can synchronize to it. The WMIC can also receive NTP broadcast
packets to synchronize its own clock. This section provides procedures for sending and receiving NTP
broadcast packets.
To configure the WMIC to send NTP broadcast packets to peers so that they can synchronize their clock
to the WMIC, follow these steps, beginning in privileged EXEC mode:
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
To disable the interface from sending NTP broadcast packets, use the no ntp broadcast interface
configuration command.
This example shows how to configure an interface to send NTP version 2 packets:
bridge(config)# interface gigabitethernet0/1
bridge(config-if)# ntp broadcast version 2
Cisco 3200 Series Wireless MIC Software Configuration Guide
50
Purpose
Enters global configuration mode.
Enters interface configuration mode, and specify the interface to send
NTP broadcast packets.
Enables 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 WMIC.
Returns to privileged EXEC mode.
Verifies your entries.
(Optional) Saves your entries in the configuration file.
Administering the WMIC

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