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https://www.cisco.com/c/en/us/support/docs/ip/network-time-protocol-ntp/108076-ntp-troubleshoot.html
Nov 05, 2008 · When Cisco routers are configured to use the NTP servers placed in the Active Directory, the Cisco routers do not receive any NTP packets from the NTP server. This issue occurs because Cisco routers use NTP and Active Directory domains use W32Time service. W32Time uses Simple Network Time Protocol (SNTP), a subset of NTP, for time synchronization.
https://support.ntp.org/bin/view/Support/CiscoNTP
be configurable using Cisco management tools and configuration files Limitations . Routers and switches are not intended to be general purpose NTP servers. There is no reference clock support built into Cisco's implementation; external servers must be configured. Related topics: Cisco NTP pages
https://community.cisco.com/t5/routing/ntp-server/td-p/1572815
Oct 22, 2010 · #ntp server 0.us.pool.ntp.org #ntp server 1.us.pool.ntp.org #ntp server 2.us.pool.ntp.org. #ntp master. Now your internet facing device is syncronized to the world clock. Next step is to configure your other devices to synch with your master. #ntp server X.X.X.X (This is the inside IP of your internet facing device) And you are done.
https://www.cisco.com/c/en/us/support/docs/availability/high-availability/19643-ntpm.html
Dec 17, 2008 · Simple Network Time Protocol (SNTP) Virtual Integrated Network Service (VINES) Time Service . Manual configuration. Certain low-end Cisco devices only support SNTP. SNTP is a simplified, client-only version of NTP. SNTP can only receive the time from NTP servers and cannot be used to provide time services to other systems.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/ntp.html
May 06, 2007 · Cisco's implementation of NTP does not support stratum 1 service; it is not possible to connect to a radio or atomic clock. We recommend that you obtain the time service for your network from the public NTP servers available on the IP Internet.
https://www.cisco.com/c/en/us/td/docs/collaboration/CWMS/b_troubleshootingGuide/b_troubleshootingGuide_chapter_0111.html
May 15, 2019 · Solution Fix the SMTP server issue or specify a different SMTP server to work correctly with your system. NTP-Provisioned Time out of Sync on Virtual Machines Problem An NTP alert is displayed at the top of the page shortly after the user logs in. The NTP provisioned times on each virtual machine are out of sync by three or more minutes.
https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-software-releases-110/15171-ntpassoc.html
Mar 19, 2014 · One possible reason for the pound sign is that the NTP client's clock differs by more than 4000 seconds from the NTP server's clock. On Cisco routers a time difference of greater than 4000 seconds is considered out of range, and prevents the router from syncing to the server.
https://community.cisco.com/t5/other-network-architecture/sntp-time-server-in-cisco-network/td-p/1415642
Simple Network Time Protocol (SNTP) is a simplified, client-only version of NTP for use on Cisco 1003, Cisco 1004, Cisco 1005, Cisco 1600, Cisco 1720, and Cisco 1750 routers. SNTP can only receive the time from NTP servers; it cannot be used to provide time services to other systems.
https://community.cisco.com/t5/network-management/ntp-server/td-p/3867262
Hi, I want to config my switch as NTP server. Could I use my switches (Model: cisco 2960 or 2950) as NTP server? What is the maximum number of the devices (routers/ switches) connected to my switch as NTP Clients? I worry my switch will overload (run slowly or too hot) if connected too much client...
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