Solved: NTP and its access-list

Solved: Hi, NTP server 10.1.1.2 / 10.1.2.2 The client switch has the below configuration. But after adding ntp access-group server-only NTP, the switch become unsynch.

Network Time Protocol

Use the ntp server command to individually specify the time server that you want your networking device to consider synchronizing with and to set your networking device to operate in the client mode.

Configuring NTP

You can control access to NTP services by using access groups. Specifically, you can specify the types of requests that the device allows and the servers from which it accepts responses.

NTP server/client configuration in switches

Hi Experts, We had core(4503), distribution(3750), and access switches(2960) in our environment. Currently we configured the clock manually in each switch, but a reboot of the switch

Configuring NTP on a Cisco Device

Cisco devices can serve as NTP servers, also known as NTP Masters. An NTP Master can utilize either an upstream NTP clock or it''s own internal

Sophos: Network Time Protocol Overview

Since the selection of pool servers rotates frequently, it is unlikely that the NTP pool could be used to mount a targeted attack. However, NTP clients typically stick with their allocated servers for an

Network Time Protocol

Overview A Network Time Protocol (NTP) server is a device that receives its time from an authoritative time source and distributes this time across the network to synchronize devices.

NTP Server Best practices

We are configuring NTP on the core switch and pointing devices to that IP address. We currently have Distro switches that host isolated networks that do not live on the core switch.

Configuring NTP

Two mechanisms are available: an access list-based restriction scheme and an encrypted authentication mechanism. Note You can create NTP peer relationships to designate the time-serving hosts that

ACL allowing NTP traffic on the switch

So this access list is not causing the issue with ntp. Note that if the other switch you mention is sending its traffic through this switch to get to the ntp servers then you certainly do need

networking

Yes, this switch can act as an NTP server. There are different ways to set it up, namely client/server, symmetric peers, multicast and broadcast modes. Most often you will likely set it up in a

Network Switches

Cisco network switches deliver performance, flexibility, and security. Cisco switches are scalable and cost-efficient and meet the demands of hybrid work.

Configuring NTP Access Restrictions

To remove access control to the switch NTP services, use the no ntp access-group {query-only | serve-only | serve | peer} global configuration command. This example shows how to

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