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Grandmetric LLC
Lewes DE 19958
16192 Coastal Hwy USA
EIN: 98-1615498
+1 302 691 94 10

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ul. Metalowa 5, 60-118 Poznań, Poland
NIP 7792433527
+48 61 271 04 43


Grandmetric LTD
Office 584b
182-184 High Street North
E6 2JA
+44 20 3321 5276

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  • Network Time Protocol (Cisco)

    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