NTP Configuration Example

In the example shown in the following figure, SW#1 synchronizes its clock from the 0-3.us.pool.ntp.org timer server, and provides the synchronized clock information to SW#2 as a unicast message, and to SW#3 as a broadcast message.

SW#2 configures SW#1 as a time server using a normal unicast message. It also has a local clock (127.127.1.1) with a stratum level of 10. SW#3 is configured as broadcast client without specific server information. For security purposes, SW#2 and SW#3 use RSA Data Security, Inc. MD5 Message-Digest Algorithm authentication with a key index of 100.

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NTP Configuration Example
../Graphics/NTP_Service_diag.png

SW#1 Configuration

create vlan internet
create vlan toSW2
create vlan toSW3
config vlan internet add port 1
config vlan toSW2 add port 2
config vlan toSW3 add port 3
config vlan internet ipaddress 10.45.203.74/24
config vlan toSW2 ipaddress 100.1.1.1/24
config vlan toSW3 ipaddress 102.1.1.1/24
config iproute add default 10.45.203.1 vr vr-default
enable ntp
create ntp key 100  md5 EXTREME
config ntp key 100 trusted
enable ntp vlan internet
enable ntp vlan toSW2
enable ntp vlan toSW3
enable ntp vlan toSW3 broadcast-server key 100
config ntp server add 0.us.pool.ntp.org
config ntp server add 1.us.pool.ntp.org
config ntp server add 2.us.pool.ntp.org
config ntp server add 3.us.pool.ntp.org
config ntp local-clock stratum 10

SW#2 Configuration

create vlan toSW1
config vlan toSW1 add port 1
config vlan toSW1 ipaddress 100.1.1.2/24
enable ntp
enable ntp vlan toSW1
config ntp server add 100.1.1.1

SW#3 Configuration

create vlan toSW1
config vlan toSW1 add port 1
config vlan toSW1 ipaddress 102.1.1.2/24
enable ntp
enable ntp broadcast-client
create ntp key 100 md5 EXTREME
config ntp key 100 trusted
enable ntp vlan toSW1