Administering the WMIC
Managing the System Time and Date
50
Cisco 3200 Series Wireless MIC Software Configuration Guide
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:
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
Command
Purpose
Step 1
configure terminal
Enters global configuration mode.
Step 2
interface
interface-id
Enters interface configuration mode, and specify the interface to send
NTP broadcast packets.
Step 3
ntp broadcast
[
version
number
] [
key
keyid
]
[
destination-address
]
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.
Step 4
end
Returns to privileged EXEC mode.
Step 5
show running-config
Verifies your entries.
Step 6
copy running-config startup-config
(Optional) Saves your entries in the configuration file.
Содержание 3200 Series
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