How to configure the NTP server on Cisco router

NTP (Network Time Protocol, the network time protocol) is a protocol based on RFC1305, is a cross Wan or LAN complex time synchronization protocol. Configuration on the router suggestions in general, and of course the configuration on other devices can be. We next based on the topology of the graph below to see NTP server is configured on the router and method ofobtaining NTP information in different segments.

The experimental requirements:

R5 acts as a NTP Server.

R1 and R6 automatically gets the NTP address from the Server.

The configuration

1, the basic information to configure the router.

R1

Inter FA 0/0

IP address 155.1.146.1 255.255.255.0

No shut

R4

Inter Ethernet 0/0

IP address 155.1.146.4 255.255.255.0

No shut

!

Interface Serial 0/0

Encaps frame-relay

No frame-relay inverse

IP address 155.1.0.4 255.255.255.0

Frame map IP 155.1.0.5 405 broad

No shutdown

R5

Interface Serial 0/0

Encaps frame-relay

No frame-relay inverse

IP address 155.1.0.5 255.255.255.0

Frame map IP 155.1.0.4 504 broad

No shut

R6

Inter gig 0/0

IP address 155.1.146.6 255.255.255.0

No shut

2, configuring the router's time zone.

R5 (config) #clock timezone Peking +8

R5 (config) #

Mar 1 00:24:49.275:%SYS-6-CLOCKUPDATE: System clock has been updated from 08:24:49Peking Fri Mar 12002 to 08:24:49 Peking Fri Mar 12002, configured from console by console

Note: the above configuration in Peking used to specify the time zone name, +8 is offset relative to the time, the value range from -23 – 23.

3, configuring the router time

R5#clock set 08:36:00 12 April 2012

4, the designated router as a NTP server, and the specified send to radio interface

R5:

NTP master 1

Interface Serial 0/0

NTP broadcast

Note: the designated router for the NTP server with the command is master, not server,attention is now back to the global schema

5, in the R4 enabled NTP client receives the clock signal sent by NTP Server

R4

Interface Serial 0/0

NTP broadcast client

6 In R1 and R6 set the NTP synchronization

R1 (config) #ntp server 155.1.146.4

R1 (config) #clock timezone Peking +8

R6 (config) #ntp server 155.1.146.4

R6 (config) #ntp peer 155.1.146.1

R6 (config) #clock timezone Peking +8

If not work, please pay attention to the following reasons, such as network access, the firewall blocked123 port (NTP port), time and NTP server client display on the time gap is too large.

Note: now use the NTP server command to specify the NTP server address, pay attention not to hope the time zone settings, otherwise the time will be UTC time.

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