Cisco switch as ntp server. All have multiple ntp servers and some have different .

Cisco switch as ntp server Aug 27, 2018 · Solved: we have one switch cisco 3850 configured as a ntp master. 101 or ntp 192. Apr 7, 2005 · The Cisco Small Business Switches support Simple Network Time Protocol (SNTP), and when enabled, the switch dynamically synchronizes the device time with time from an SNTP server. which one is secure, internal NTP server or Public(Internet) NTP server. Why, you might be asking? One example is that SYSLOG log entries are all stamped with the time. (No need to check time to time) Oct 12, 2020 · All Cisco switches and routers still require to synchronize their NTP clocks to a Stratum 1 or 2. 3. Thanks for the help guys! Aug 29, 2020 · Hey guys, Can I configure two different ntp servers as a time source for my cisco 9500 Switch at the same time? like below? Thanks. It’s usually a public NTP server like US NIST Internet Time Service or it is pointed to an internal NTP server. My current configuration is having host 172. Is it possible to use a windows ser Nov 4, 2013 · ‎ 11-04-2013 05:35 PM Jeff, Leo, The only ntp commands that I have on the 3750 Stack is: ntp server 10. It is currently synched to an outside NTP server. It would probably start to work if i remove and add the ntp server statement againt. please help me. Jul 16, 2008 · I am having issues with 3600 and 7200 routers not sysncing with NTP server. It just means to sync with the NTP authorative server and whenever there is some changes in time in NTP authorative server it automatically changes in our device. I am running a windows server 2008 domain but I am not using an external time source. If stratum-2 server-1 fails, switch 1 maintains the correct time through its peer association with switch 2. I had no problem to sync ntp server with most of 3850 switches (e. Sep 19, 2009 · Hi, Am trying to sync the time of my cisco devices to the time of my domain. For broadcast client mode to work, the broadcast server and its clients must be located on the same subnet. Dec 6, 2019 · If the NTP client on a switch has lost synchronization with servers or peers, you may need to restart the NTP client. If the time is off from device to device it will make t-shooting events and event correlation that much more difficult. Whats wrong with the below commands? Server: ntp authentication-key 1 md5 xxx ntp authenticate ntp master Aug 31, 2021 · This article provides instructions on how to configure the system time settings on Cisco Business 250 or 350 series switches. I would like to implement authentication between the server and the client. y. An NTP network usually gets its time from an authoritative time source such as a radio clock or an atomic clock attached to a time server. My NTP server is working fine as I have other devices syncing to it. 66 act as an NTP server with NTP server software. NTP uses the User Datagram Protocol (UDP) as Mar 22, 2007 · Hello all, I am tinkering with ntp services and ran into a bit of a roadblock when it comes to verification that everything is running. If the configuration is done on the server (the switch with the NTP master), source address of the outgoing packet will still be that of the received destination address. Jun 8, 2021 · Hello Community, How to set up ntp time synchronization with a specific server (time pattern in my LAN) on a Catalyst C1000 switch (web gui or cli) ? Regards. 168. For network devices like routers, switches, or firewalls this is very important because we want to make sure that logging Sep 4, 2024 · We want to point this instead to an authoritative NTP Server. My router and switch then use the 172. ntp server 10. There are no workarounds for this vulnerability other than disabling NTP on the device. Apr 14, 2025 · This document describes a simple configuration and validation for a Nexus 9000 platform to act as both Network Time Protocol (NTP) server and client. 13 priority 2 ntp enable Jun 18, 2024 · To reset the NTP configuration on a C2960-X switch to factory settings, you need to remove each NTP server manually as Cisco IOS does not provide a single command to clear all NTP servers at once. 101 Under switch 2950 which option i should choose to config ntp server ntp server 132. Nov 27, 2024 · Consequently, time accuracy can be marginally reduced because time information flows only one way. In Cisco devices, NTP Configuration is done with these NTP commands. version 3. IP Application Services-Some links below may open a new browser window to display the document you selected. To configure a router to allow its software clock to be synchronized with the software clock of a Network Time Protocol (NTP) time server, use the ntp server command in global configuration mode. 1 Please let meknow thanks Sep 5, 2024 · Network Time Protocol (NTP) Introduction NTP Modes NTP Configuration for IPv4 NTP Versions NTP Configuration for IPv6 Introduction Network Time Protocol (NTP) allows network infrastructure device to keep its system time synchronized to an external accurate time source. You can manage the system time and date settings on your switch using automatic configuration, such as the SNTP, or manual configuration methods. 14 priority 1 ntp server 10. NTP then distributes this time across the network. Apr 20, 2020 · Configuring a Cisco IOS device (router/switch) is probably one of the easiest things that you can do. Clock Technology and Public Time Servers The Internet NTP subnet presently includes over 50 public primary servers synchronized directly NTP Overview The Network Time Protocol (NTP) synchronizes the time of day among a set of distributed time servers and clients so that you can correlate events when you receive system logs and other time-specific events from multiple network devices. NTP Version 3 is documented in RFC 1305. Jun 17, 2015 · The NTP source-interface and source configuration has a limitation of getting applied only when configured on the client. Jul 7, 2014 · This lesson explains how to configure NTP on your Cisco network devices including access-control and authentication. Apr 30, 2024 · Hello everybody so i have been assigned to a task from my manager he wants me to activate ntp on a cisco switch (catalyst 9200 ) i have all the command line but he keeps telling me you are missing something not on the commands but where to apply this ntp on which interface keep in mind we have a Jul 31, 2019 · Other devices can configure it as a time server. in ntp master we use just ntp master command and another Jun 10, 2009 · To configure a Cisco 800, Cisco 1003, Cisco 1004, Cisco 1005, Cisco 1600, Cisco 1720, or Cisco 1750 router to use the Simple Network Time Protocol (SNTP) to request and accept Network Time Protocol (NTP) traffic from a stratum 1 time server References Basic System Management Commands NTP: Best Practices White Paper Home of The NTP Project RFC Aug 6, 2016 · Hi. 163. Apr 23, 2025 · Before synchronizing, NTP compares the time reported by several network devices and does not synchronize with one that is significantly different, even if it is a stratum 1. NTP runs on User Datagram Protocol (UDP), which in turn runs on IP. A Windows Server or Linux server running with NTP service. I have entered the following: switch (config) #ntp server x. In this configuration, switch 1 and switch 2 are NTP peers. Use the ntp master command, in global configuration mode, to configure the device to be an authoritative NTP server. x prefer switch (config) #ntp server y. All have multiple ntp servers and some have different Oct 12, 2023 · PTP as a Reference Clock for NTP You can configure Precision Timing Protocol (PTP) time as the reference clock for Network Time Protocol (NTP) by enabling the feature on a Cisco Catalyst IE9300 Rugged Series Switch. Cisco network switches deliver performance, flexibility, and security. NTP uses the User Datagram Protocol (UDP) as its transport protocol. But there is a little homework you should to do make sure you implement a NTP configuration that will perform well. Jan 19, 2021 · ntp broadcast client ntp primary ntp multicast client ntp peer ntp server For more information on understanding Cisco software releases, see the White Paper: Cisco IOS and NX-OS Software Reference Guide. I also tried to sync to exte Aug 24, 2023 · Solved: Hi All, I wanted to configure the NTP server in our network. switch 1 uses stratum-2 server 1, while switch 2 uses stratum-2 server 2. google. In this example, we will see how to configure NTP on Cisco devices. No router. We are configuring NTP on the core switch and pointing devices to that IP address. The routers do have access to the NTP s Sep 12, 2024 · This document describes the working of Network Time Protocol (NTP), Precision Time Protocol (PTP), and Synchronous Ethernet (SyncE) with concepts, sample configurations, and troubleshooting scenarios for Cisco Nexus 9000 switches. 66 address for thei Nov 5, 2008 · This document provides troubleshooting information for common problems with Network Time Protocol. I tried to re-enable ntp server on the switch. How to configure Cisco Router/Switch to Synchronize time from an internet NTP Time Server Step 1 - Before configuring NTP, make sure that all Cisco Routers, and Switches are configured with same timezone. NTP NTP stands for Network Time Protocol. x (primary domain controller) ntp server 10. 3se), but I have a 3850 with version 3. Network Time Protocol (NTP) Commands This chapter describes the Cisco IOS XR Network Time Protocol (NTP) commands used to perform basic network time management tasks, including synchronizing time settings and coordinating time distribution over the network. Learn basic concepts of NTP such as what NTP is, how NTP works, NTP stratum levels, meaning of synchronized and un-synchronized NTP clock in detail. Network Time Protocol (NTP) is a protocol designed to time-synchronize a network of machines. The ultimate goal […] Jun 30, 2006 · Hi, is there a possibility of making a Switch/Router to act as NTP server? i have got Switches - 6509,3750,3550,2960,2950 Routers - 1700,2500,2600 Series. y switch (config) #clock timezone CST -5 switch (config) #clock summer-time CDT recurring switch (config) #exit With that, the switch keeps the same incorrect time. My question is, what is the best practi Configuring NTP This chapter describes how to configure the Network Time Protocol (NTP) on Cisco MDS 9000 Series switches. Will my way cause any potential issues, especially security? Apr 23, 2024 · This document describes how to use the show ntp associations command output to determine if NTP works properly. My coworker recommended me to setup NTP server on domain controller (DC), but I'm thinking to put time. x (secondary domain controller) I can downgrade to 12. 7. Mar 22, 2024 · If you want your core switch to serve time to clients (and you aren't concerned with any of the security considerations) then simply configure the mgmt interface as an ntp source interface using the "ntp source-interface" command, point the core switch to a reliable (and reachable) time source using the "ntp server" command, verify that the Sep 26, 2025 · To configure the device to use the SNTP to request and accept Network Time Protocol (NTP) traffic from a specified server (meaning to accept system time from an SNTP server), use the sntp server command in Global Configuration mode. Jan 15, 2010 · Hi all, I have switch 2950 its default gateway is Router Lan interface 192. Information About the NTP Server The Network Time Protocol (NTP) synchronizes the time of day among a set of distributed time servers and clients so that you can correlate events when you receive system logs and other time-specific events from multiple network devices. Cisco switches are scalable and cost-efficient and meet the demands of hybrid work. Apr 27, 2010 · I am trying to configure NTP on a Cisco Catalyst 2960 switch running version 12. Sep 15, 2016 · Hi I have a 3850 switch with NTP configured. We currently have Distro switches that host isolated networks that do not live on the core switch. 4E which cannot sync to ntp server. 110. I have tried to point my cisco device to my domain controller as the NTP server but without success. when we update another switch time form ntp server its update time but, its time is diffrent form our ntp master switch. Apr 17, 2019 · The objective of this document is to provide and explain the (CLI) steps to enable an SNTP server to synchronize time settings for a switch. We are planning to make a single switch as a NTP servers and others are clients to synchronis Sep 26, 2019 · Hi there, I'm asking for your opinions on NTP server for cisco switch or router. Nov 4, 2025 · This document describes how to troubleshoot Network Time Protocol (NTP) issues with debug commands and the show ntp command. I have looked all over the internet and documentations for this but could not find how to remove all ntp servers in a single command for cisco switches 2960, 4500, etc basically I have over 1000+ switches that need to change ntp servers. Oct 22, 2010 · Hi, I want to configure NTP server for my Router,Switch and Firewall. Jan 12, 2024 · Before synchronizing, NTP compares the time reported by several network devices and does not synchronize with one that is significantly different, even if it is a stratum 1. Jan 11, 2023 · We are currently setting up NTP on a rather large network, 600+ Cisco Devices. Dec 7, 2010 · Hello I've tried many different combinations and have not been able to get NTP to synch. But are there any ways to get this to work again without recon Sep 25, 2021 · So, setting up NTP server does not mean to setting or receiving the time in local time accurately. Feb 29, 2012 · Hi Experts, We had core(4503), distribution(3750), and access switches(2960) in our environment. PTP time acts as a stratum 0 source, and the Cisco IOS NTP server acts as a stratum 1 device. Sep 19, 2008 · The Cisco equipements, can not synchonize with Microsoft Domain Controller, I have test the Microsoft NTP Server with a NTP Soft Client and it is working good, but NTP on Cisco equipments do not work against Microsoft. Mar 14, 2024 · In a star structure, all the routers have a client/server relationship with a few time servers in the core. 70. With the User Datagram Protocol (UDP) as its transport protocol, NTP uses standard Universal Time Coordinated (UTC). 16. The dedicated time servers are the center of the star and are usually UNIX systems synchronized with external time sources, or their own GPS receiver. 2. 5 (55)SE8 to test if you like. Is there a command in the IOS (12. I have the following commands which does not work. Jul 7, 2023 · Configuring NTP on a Cisco Device UPDATED: 7/7/2023 Configuring NTP on a Cisco device is an easy, and essential, step when configuring a new router or switch. NTP synchronizes timekeeping among a set of distributed time servers and clients. Default Settings for NTP The following table lists the default settings for NTP parameters. Currently we configured the clock manually in each switch, but a reboot of the switch resets the clock also. The connection to the NTP server was disconnected briefly but after the reconnect NTP hasn't syncroniced. 1. g. According to Cisco NTP configuration Oct 10, 2007 · I am setting up NTP master server on Catalyst 4000 series switch. A Raspberry Pi is a very cheap computing device which is a suitable platform to be a Stratum-1 NTP server. Dec 21, 2021 · Usually only a router can do that , but you should separate switching services from ntp service , the benefit being that an NTP server on the Intranet can easily be configured to sync time with the NTP-services offered by the ISP , using correct firewall policies. Because Cisco NX-OS cannot connect to a radio or atomic clock and act as a stratum 1 server, we recommend that you use the public NTP servers available on the Internet. Sep 19, 2024 · If you configure NTP in a VRF, ensure that the NTP server and peers can reach each other through the configured VRFs If you are using the switch as an edge device and want to use NTP, we recommend using the ntp access-group command and filtering NTP only to the required edge devices. Can I set up one of the switches as an NTP server and the other will sync with that switch? Thanks, Yared. 1 Also i have configured ntp server on Router as ntp server 132. com (external source) as my NTP server directly on switch or router. Define your NTP Strategy Before you start, you need to determine your NTP strategy. Use the ntp broadcast client command to set your networking device to listen for NTP broadcast packets propagated through a network. Nov 6, 2025 · This tutorial explains how to configure NTP Server and NTP Client in Cisco Router step by step with practical example. how do i configure in my domain server?. NTP Nov 26, 2019 · Other devices can configure it as a time server. 8) that forces the switch to contact the ntp server it's pointing to in order to update the time? I know there is a windows comm Dec 10, 2018 · Other devices can configure it as a time server. The 3600 and 7200 routers can sync to public NTP servers on the internet but cannot sync to my internal NTP server. Nov 8, 2019 · Hi there, I setup NTP server on a domain controller. The network is isolated from any outside connection. Hi all, How synchronize the clock of my Cisco switch to what the NTP server says? Is there any public and free access NTP servers? Thanks. In my environment, I have no NTP server at all (and cannot add one). So, the solution is Learn how to configure the NTP on Cisco Switch, by following this simple step-by-step tutorial, you will be able to configure your system to set the correct date and time automatically using NTP servers from the internet. Instead, I manually input the time periodically to the Cisco Catalyst 9500 switch and have configured the switch to serve as an NTP source for everyone else (at least, that was my intent). Now, the server itself should pointed to an external authoritative NTP server as well. This will restart the synchronization process with all NTP servers and peers configured on the local switch. . x. Feb 18, 2024 · Scenario: Make: Cisco Model: Cisco 2960 Series Mode: Command Line Interface [CLI] Description: In this article, we will discuss a stepwise method of how to configure NTP or Network Time Protocol on the Cisco 2960 switch stack. You can configure a Cisco Catalyst 9000 Series Switch to act as an authoritative NTP server, enabling it to distribute time even when it is not synchronized to an outside time source. 4. ztp oxtg phhhd iilw gfa klqj bwyu gzot ohls gawk msncu fwox lxyyf zutr oqut