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1. Time Synchronization with NTP

The Network Time Protocol (NTP) enables you to synchronize time among network devices such as routers or switches in a network. It works by using an NTP server that maintains a highly accurate time, and allows clients to query for that time.

1.1. Prerequisites

  • An NTP server must be installed and configured in your network.

  • You must know the address of the NTP server.

1.2. Enabling NTP Service

To enable the NTP service, you need to perform the following tasks.

  • Enable the NTP service

  • Specify the NTP server

1.2.1. Enabling the NTP service

To enable the NTP service under a specific VRF where NTP server is reachable (usually the inband management VRF), enter the following command:

rtb confd set inband management instance <inband-mgmt-vrf> service ntp

Command Parameters

<inband-mgmt-vrf>

Specify the name of the VRF from which NT is reachable

Example
admin@rtbrick:~$ rtb confd set inband management instance mgmt-vrf service ntp
admin@rtbrick:~$
admin@rtbrick:~$ rtb confd show datastore table dump global.instance.inband.mgmt.config
object: 1, sequence: 2, last update: Tue Sep 22 14:54:49 GMT +0000 2020
  attribute: instance_name (1), type: string (9), length: 9, value: mgmt-vrf
admin@rtbrick:~$

1.2.2. Specifying the NTP Server

To specify the NTP server, perform the following tasks:

1.2.2.1. Specify the IPv4 Server Address

To specify the IPv4 server address, enter the following command:

rtb confd set system ntp server <ntp_server_id> address <server_address>

Command Parameters

<ntp_server_id>

Specifies the name of the NTP server.

<server_address>

Specifies the IPv4 address of the NTP server.

Example
admin@rtbrick:~$ rtb confd set system ntp server Server1 address 1.1.1.1
admin@rtbrick:~$
admin@rtbrick:~$ rtb confd show datastore table dump global.ntp.config
object: 1, sequence: 1, last update: Tue Sep 22 14:47:07 GMT +0000 2020
  attribute: ntp_server_id (1), type: string (9), length: 8, value: Server1
  attribute: ntp_server_ipv4 (2), type: ipv4addr (12), length: 4, value: 1.1.1.1
admin@rtbrick:~$
1.2.2.2. Specify the Domain Name of the NTP Server

To specify the domain name of the NTP server, enter the following command:

rtb confd set system ntp server <ntp_server_id> domain-name <server_domain_name>

Command Parameters

<ntp_server_id>

Specifies the name of the NTP server.

<server_domain_name>

Specifies the domain name of the NTP server.

Example
admin@rtrick:~$ rtb confd set system ntp server Server2 domain-name 0.ubuntu.pool.ntp.org

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