Knowledge Base

Design & Configure

Network Time Protocol (Cisco)

Technology: Network Services

Area: Network Time Protocol (NTP)

Vendor: Cisco

Software: IOS 12.X , 15.X

Platform: Catalyst Switches, Routers


The Network Time Protocol (NTP) is able to synchronize the time of day between time servers and clients which are distributed so that the events can correlate when receiving system logs and other time-specific events from multiple network devices. NTP uses the User Datagram Protocol (UDP) as its transport protocol.


To configure an NTP server of IP as a time reference:

switch# configure terminal
switch(config)# ntp server


If NTP server supports authentication, use key command:

switch(config)# ntp server key Cisco


To configure ntp in ipv6 environment:

switch(config)# ntp peer 2001:0db8::4101


To verify ntp settings:


switch(config)# show ntp peers
Peer IP Address Serv/Peer
2001:0db8::4101 Peer (configured) Server (configured)


Use also:

switch(config)# show ntp association
switch(config)# show ntp status


Author: Marcin Bialy