Router#show clock
*00:07:27.092 UTC Fri Mar 1 2002

Oups! Notre routeur n’est pas à l’heure… Voyons comment le configurer automatiquement via le protocole NTP http://www.pool.ntp.org/fr/.

Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#ntp server 0.fr.pool.ntp.org
Translating "0.fr.pool.ntp.org"...domain server (192.168.100.62) [OK]

Router(config)#^Z
Router#
*Mar  1 00:07:50.202: %SYS-5-CONFIG_I: Configured from console by console

Vérifions si la configuration fonctionne:

Router#show clock
21:30:17.756 UTC Mon Jan 25 2010
Router#show ntp status
Clock is synchronized, stratum 3, reference is 80.65.235.4
nominal freq is 249.5901 Hz, actual freq is 249.5901 Hz, precision is 2**18
reference time is CF088BC5.652BBA9F (21:29:41.395 UTC Mon Jan 25 2010)
clock offset is 3.6315 msec, root delay is 48.29 msec
root dispersion is 15903.61 msec, peer dispersion is 15875.09 msec
Router#

et voila! Mais On est en UTC… indiquons au routeur notre fuseau horaire et les dates de passage à l’heure d’été / heure d’hiver:

Router(config)#clock timezone CET 1
Router(config)#
Jan 25 21:32:39.294: %SYS-6-CLOCKUPDATE: System clock has been updated from 21:32:39 UTC Mon Jan 25 2010 to 22:32:39 CET Mon Jan 25 2010, configured from console by console.
Router(config)#clock summer-time CEST recurring  last Sun Mar 2:00 last Sun Oct 3:00
Router(config)#
Jan 25 21:33:26.819: %SYS-6-CLOCKUPDATE: System clock has been updated from 22:33:26 CET Mon Jan 25 2010 to 22:33:26 CET Mon Jan 25 2010, configured from console by console.
Router(config)#^Z
Router#
Jan 25 21:33:29.572: %SYS-5-CONFIG_I: Configured from console by console
Router#show clock
22:35:53.244 CET Mon Jan 25 2010
Router#

et voila ! Il ne reste plus qu’à enregistrer la configuration

Router#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]
Router#