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Configuration NTP

Network Time Protocol

Introduction

Pour effectuer une synchronisation NTP, il faut tout d'abord que le switch puisse aller sur internet

-> ip interface "vlan1" address 192.168.10.100 mask 255.255.255.0 vlan 1 ifindex 1
-> ip static-route 0.0.0.0/0 gateway 192.168.10.1 metric 1
Passons à la configuration du NTP
-> ntp server 194.2.0.28 prefer
-> ntp server 38.229.59.9
-> ntp server enable
-> ntp server synchronised
Configuration de la timezone
-> system timezone CET
-> system daylight-savings-time start last sunday in march at 02:00 end last sunday in october at 03:00
-> system daylight-savings-time enable
Vérification
-> show ntp server status
IP address         = 38.229.59.9,
Host mode          = client,
Peer mode          = server,
Prefer             = yes,
Version            = 4,
Key                = 0,
Stratum            = 2,
Minpoll            = 6 (64 seconds),
Maxpoll            = 10 (1024 seconds),
Delay              = 0.167 seconds,
Offset             = 660733522.277 seconds,
Dispersion         = 0.953 seconds
Root distance      = 0.083,
Precision          = -20,
Reference IP       = 172.16.21.35,
Status             = configured : reachable : rejected,
Uptime count       = 1402 seconds,
Reachability       = f,
Unreachable count  = 0,
Stats reset count  = 1043 seconds,
Packets sent       = 6,
Packets received   = 4,
Duplicate packets  = 0,
Bogus origin       = 0,
Bad authentication = 0,
Bad dispersion     = 0,
Last Event         = peer changed to reachable,


IP address         = 194.2.0.28,
Host mode          = client,
Peer mode          = server,
Prefer             = no,
Version            = 4,
Key                = 0,
Stratum            = 2,
Minpoll            = 6 (64 seconds),
Maxpoll            = 10 (1024 seconds),
Delay              = 0.017 seconds,
Offset             = 660733522.272 seconds,
Dispersion         = 1.952 seconds
Root distance      = 0.000,
Precision          = -23,
Reference IP       = 172.19.123.3,
Status             = configured : reachable : rejected,
Uptime count       = 1402 seconds,
Reachability       = 7,
Unreachable count  = 0,
Stats reset count  = 1261 seconds,
Packets sent       = 3,
Packets received   = 3,
Duplicate packets  = 0,
Bogus origin       = 0,
Bad authentication = 0,
Bad dispersion     = 0,
Last Event         = peer changed to reachable,

et 

-> show ntp client
Current time:                   Wed, Dec 8 2021  9:47:58.667 (UTC),
Last NTP update:                Wed, Dec 8 2021  9:47:28.033 (UTC),
Server reference:               38.229.59.9,
Client mode:                    enabled,
Broadcast client mode:          disabled,
Broadcast delay (microseconds): 4000,
Server qualification:           synchronized
Il est aussi possible de régler l'heure et la date à la main
-> system date 08/12/2021
-> system time 10:48:00
Supprimer un serveur NTP :
-> no ntp server 194.2.0.28 prefer

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