time protocol
　　using the diagram below configure network time protocol.
　　send_ntp will provide time to receive_ntp.
　　use your current time and location for your clock settings.

　　此主题相关图片如下：

　　solution:
　　set the appropriate time and time zone for the router that will act as
　　your time server.
　　also set the time server using the "ntp master" command.
　　at the appropriate interface broadcast the ntp protocol.
　　send_ntp#clock set 07:30:00 20 jan ...
　　1999
　　send_ntp#config t
　　enter configuration commands, one per line. ...
　　end with cntl/z.
　　send_ntp(config)#clock ?
　　summer-time configure summer (daylight ...
　　savings) time
　　timezone configure time zone
　　send_ntp(config)#clock timezone est 5
　　send_ntp(config)#clock summer-time ?
　　word name of time zone in summer
　　send_ntp(config)#clock summer-time est ?
　　date configure absolute summer time
　　recurring configure recurring summer time
　　send_ntp(config)#clock summer-time est ...
　　recurring
　　send_ntp(config)#int s0
　　send_ntp(config-if)#ntp broadcast
　　send_ntp(config)#ntp master
　　send_ntp#sh run
　　building configuration...
　　%sys-5-config_i: configured from console by ...
　　console
　　current configuration:
　　!!

　　last configuration change at 07:40:38 est ...
　　wed jan 20 1999
　　!
　　version 11.3
　　no service password-encryption
　　!
　　hostname send_ntp
　　!
　　!
　　clock timezone est 5
　　clock summer-time est recurring
　　!
　　interface ethernet0
　　ip address 172.16.2.32 255.255.255.0
　　!
　　interface serial0
　　ip address 172.16.4.5 255.255.255.252
　　no ip mroute-cache
　　ntp broadcast
　　no fair-queue
　　!
　　interface serial1
　　no ip address
　　shutdown
　　!
　　router rip
　　network 172.16.0.0
　　!
　　ip classless
　　line con 0
　　line 1 8
　　line aux 0
　　line vty 0 4
　　!
　　ntp master
　　end
　　to configure the receiving router, just point it to the time server.
　　before router is configured to receive time from ntp server:
　　receive_ntp#sh clock
　　*00:05:04.359 utc mon mar 1 1993
　　receive_ntp#config t
　　enter configuration commands, one per line. ...
　　end with cntl/z.
　　receive_ntp(config)#ntp server ...
　　172.16.4.5
　　receive_ntp(config)#^z
　　%sys-5-config_i: configured from console by ...
　　console
　　receive_ntp#sh clock
　　.02:31:46.866 utc wed jan 20 1999
　　receive_ntp#sh run
　　building configuration...
　　current configuration:
　　!
　　version 11.3
　　no service password-encryption

hostname receive_ntp
　　interface serial0
　　ip address 172.16.4.6 255.255.255.252
　　no ip mroute-cache
　　clockrate 56000
　　!
　　interface serial1
　　no ip address
　　shutdown
　　!
　　interface serial2
　　no ip address
　　shutdown
　　!
　　interface serial3
　　no ip address
　　shutdown
　　!
　　interface tokenring0
　　no ip address
　　shutdown
　　!
　　interface bri0
　　no ip address
　　shutdown
　　!
　　ip classless
　　line con 0
　　line aux 0
　　line vty 0 4
　　login
　　!
　　ntp server 172.16.4.5
　　end