This keeps all network computers synchronized with a central server. Best practice would be obviously to use more than one server here in the event one fails. Windows 2012 r2 ntp server unable to sync with cisco nexus. How to setup windows as ntp server for cisco devices. Cisco nexus 7000 series nxos cli management best practices. The modular cisco nexus 7000 and 7700 switches deliver a comprehensive cisco nxos feature set and opensource programmable tools for software defined networking sdn deployments. In order to configure ntp on a nexus 7000 switch, you must have connectivity to at least one server that is running ntp. Also 5k doesnt support manually setting the clock if ntp is on which is the default. The ntp 7000 comes standard with sntp capability for synchronization to preprogrammed sntp web servers. You will furthermore learn these troubleshooting procedure basics. Cisco nexus 7000 series nxos system management command reference, release 5.
Of course this would depend on nexus ntp working correctly, whic as far as i can tell, it does not. That is all you need to get going, however it isnt an ideal configuration. Ill ignore security and local ntp architecture and focus on your current. Cisco nxos software you will learn how to utilize the management features that are accessible on the cisco nexus 7000 series switch, and how to organize those features to support the management infrastructure necessities. Can the nexus 7000 provide ntp to the rest of my network. While nexus starting with m1 series line cards which majorly performed all layer 3 related features and operations, f1series line cards were basically layer 2 cards and used for fex, fabric path, and fcoe etc further drilling into mseries, we understand that m1 series were the introductory line cards for. No session if i enable cfs ip v4 distribution will it start responding to ntp requests ntp side is setup now. Ieee 1588 ptp 20022008 master stack software from realtime systems gmbh. Cisco nexus 7000 series nxos system management configuration guide, release 5.
These configurations are useful especially on a nexus 7000 switch with multiple vdcs configured. Anyone have experience with setting up their nexus 7k core as an ntp server. With a variety of style and power options, plus dedicated project. Our vendor never setup ntp our on core nexus switches. The core switch will synchronize to one or more stratum 1 ntp servers, and allow all internal switches and routers, and even servers to synchronize to it. Network time protocol nxos troubleshooting tools cisco press. If the configuration is specified, ensure that the ntp server is reachable via the specified ip address. A vulnerability in the network time protocol ntp feature of cisco nxos software could allow an unauthenticated, remote attacker to cause a denial of service dos condition on an affected device. To configure the device to act as an authoritative network time protocol ntp server, use the ntp master. I decided to refresh my earlier article on migrating to nexus 7000 from catalyst 6500 and 4500 switches with some 5. How do i simply setup a cisco router to look at its own clock as the ntp source, use the ntp master command. Ntp has the following configuration guidelines and limitations.
To authenticate ntp server and ntp peer associations, specify the key keyword. Cisco nexus 7000 series nxos system management configuration guide. Cisco network time protocol ntp lessons discussion. This image is not for use in a production environment and is considered to be a simulator for the nexus 7000 series and is not an emulator as the software dataplane does not emulate the nexus 7000 series forwarding hardware. This course covers the key components and procedures you need to know to configure, manage, and troubleshoot the cisco nexus 7000 series switch platform. Lets say a router is configured to sync its time from a ntp server and the ntp server is. We have 8 cisco nexus 3000 series manuals available for free pdf download. The source of ntp packets is defined using the commands ntp source ipaddress and ntp sourceinterface interfaceid.
Those implementing or have existing nexus 777k platforms in their network. The configuring cisco nexus 7000 switches dcnx7k v3. Network time protocol servers provide network users with updated system time values. It has to first get time from something else like an actual ntp server or an ios router, then it can serve time to another device.
On switches configured for ntp and running affected code, following workaround can be used. Cisco nxos software network time protocol denial of. Configuring the device as an authoritative ntp server 36 configuring an ntp server and peer 37. I ma trying to query ciscoportchannel mib on nexus 7000 for portchannel table and i am not getting any info. Crystal instruments ieee 1588 spiderhub industrial ethernet switch. Nxos does not support all the features of ios, for example, acting as a dhcp server and ntp authentication. We know time is able to sync, it is just not able to sync with the cisco nexus. Anyone else who just wants to hang out and learn session goal troubleshooting methodology is the same, no matter the platform where and what where to look, and what to use quick and easy data collection cheat sheets. Ntp master cisco nexus 7000 series reference manual page 329.
John is our cto and the practice lead for a talented team of consultants focused on designing and delivering scalable and secure infrastructure solutions to customers across multiple industry verticals and technologies. If you configure ntp in a vrf, ensure the ntp server and peers can reach each other through the configured vrfs. Saplings new ntp 7000 series master clock enables a user to have complete flexibility over their system. We are able to sync with 2 of those time sources and other external time sources such as ntp. Cisco can nexus 7000 provide ntp to rest of network. Cisco can nexus 7000 provide ntp to rest of network aug 4, 2010.
Ntp on nexus 7000 series switch configuration example cisco. Cisco nexus 7k as ntp server network engineering stack exchange. This bug will apply to the cisco nexus 7000 n7k, cisco nexus 6000 n6k, cisco nexus 5000 n5k and cisco multilayer director switch mds and the fix is currently targeted for a release towards the end of cy2015. Cisco nxos is a data centerclass operating system built with modularity, resiliency, and. For more information on high availability, see the cisco nexus 7000 series nxos high availability and redundancy guide. Cisco nexus line cards m1 vs m2 vs m3 ip with ease. This is the main command that enables the nexus device to act as a ntp server on the network. Cscvm35740 a vulnerability in the network time protocol ntp feature of cisco nxos software could allow an unauthenticated, remote attacker to cause a denial of service dos condition on an affected device.
Configuring ntp and timezones on cisco devicesucs, mds. Hi everyone, can the nexus 7000 provide ntp to the rest of my network. On a multivdc nexus 7000 switch, the hardware clock is synchronized in the default vdc, and a nondefault vdc can get the timing update from the default vdc. Cisco nexus 7k as ntp server network engineering stack. Configuring cisco nexus 7000 switches dcnx7k training.
I am the pdc admin, the windows ntp server is set correctly, we have 5 different time sources set. At the time of publication, this vulnerability affected the following cisco products if they were running a vulnerable release of cisco nxos software and had the ntp feature enabled. The first one has the option prefer after it to set it as the primary. This example shows how to enable ntp authentication. With primex clocks and timers, you can trust the accuracy of every clock throughout your facility. They offer highdensity 10, 40, and 100 gigabit ethernet with application awareness and performance analytics. Ntp recognizes virtual routing and forwarding vrf instances. Fsmlabs 1gbps pocket grandmaster ieee 1588v2 ptp ntp gps clocks from fsmlabs. The stratum 2 at the end of the command identifies what type of ntp server it is. Ntp server functionality is not supported in cisco nxos release 4. Cisco nxos software and cisco mds switches are vulnerable to attacks utilizing mode 7 ntp requests. These are the ntp sources that my nexus device uses to become a stratum 2 ntp server. The nexus 7000 is a layer 3 core switch, which is a very logical place to centralize ntp services.
I have the followign ntp configuration on it, and have used the commit command, but it seems to be ignoring any ntp requests from other devices. The clock has two preprogrammed relays that are dedicated for synchronous wired clock systems. The software clock can be updated periodically from ntp, and it in turn updates. See the cisco nexus 7000 series nxos unicast routing configuration guide for more information about vrfs. Identify the chassis and components of the cisco nexus 7000 switch. When the ntp server pushes the update to the n7k ntpd client, which in turn schedules the update to the kernel. Contribute to datacenternexus7000 development by creating an account on github. Ntp uses the default vrf if you do not configure a specific vrf for the ntp server and ntp peer.
Cisco nexus 7000 series nxos system management command. You should have a peer association with another device only when you are sure that your. I have the followign ntp configuration on it, and have used. Advanced troubleshooting nexus 7000 series switches. After a reboot or a supervisor switchover, the running configuration is applied. There is no support for this image from ciscos technical advisory center. Additionally, users can configure a nexus switch as an authoritative time server using the command ntp master. Ntp must be configured in the default virtual device context vdc. This push should have happened 24 hours before june 30th, by most ntp servers. In order to properly work with my existing ccie security lab i needed a valid ntp server in my virtual lan, i decided to use windows 2003 box as ntp server for my cisco routers, switches and other linux machines running with the help of gns3, virtual box and vmware workstation creating a full virtual lan atmosphere. Overview the configuring cisco nexus 7000 switches dcnx7k v3. According to the documentation, ntp master causes the nexus to continue to answer ntp requestes from clients if the nexus s time sources servers are unreachable. The architecture of the hardware and cisco nxos software will be explained, along with the purpose and configuration of the connectivity management processor cmp.
This is an introduction to the cisco nxos operating system. The nondefault vdc also acts as the server for other clients in the network after the ntp master command is configured under the vdc. Cisco nxos software and cisco mds switches are vulnerable to attacks utilizing mode 7 ntp. Cisco content hub cisco nexus 7000 series switches. Ieee 1588 ptp stack, xr7 ptp, from tttech flexibilis oy. Nexus 5600 platform switches, nexus 6000 series switches, nexus 7000 series switches, nexus 7700 series switches, nexus 9000 series switches in. Added the ability to configure the device as an authoritative ntp server, enabling it to distribute time even when it is not synchronized to an.
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