Connectivity Guide

Broadcasts
Receive broadcasts of time information and set interfaces within the system to receive NTP information through broadcast.
NTP is enabled on all active interfaces by default. If you disable NTP on an interface, the system drops any NTP packets sent to
that interface.
1. Set the interface to receive NTP packets in INTERFACE mode.
ntp broadcast client
2. Disable NTP on the interface in INTERFACE mode.
ntp disable
Configure NTP broadcasts
OS10(config)# interface ethernet 1/1/10
OS10(conf-if-eth1/1/10)# ntp broadcast client
Disable NTP broadcasts
OS10(config)# interface ethernet 1/1/10
OS10(conf-if-eth1/1/10)# ntp disable
Source IP address
Configure one interface IP address to include in all NTP packets. The source address of NTP packets is the interface IP address
the system uses to reach the network by default.
● Configure a source IP address for NTP packets in CONFIGURATION mode.
ntp source interface
○ ethernet — Enter the keyword and node/slot/port information.
○ port-channel — Enter the keyword and number.
○ vlan — Enter the keyword and VLAN number, from 1 to 4093.
○ loopback — Enter the keyword and number, from 0 to 16383.
○ mgmt — Enter the keyword and node/slot/port information. The default is 1/1/1.
Configure source IP address
OS10(config)# ntp source ethernet 1/1/10
View source IP configuration
OS10(config)# do show running-configuration | grep source
ntp source ethernet1/1/1
Authentication
NTP authentication and the corresponding trusted key provides a reliable exchange of NTP packets with trusted time sources.
NTP authentication begins with creating the first NTP packet after the key configuration. NTP authentication uses the message
digest 5 (MD5) algorithm. The key is embedded in the synchronization packet that is sent to an NTP time source.
1. Enable NTP authentication in CONFIGURATION mode.
ntp authenticate
2. Set an authentication key number and key in CONFIGURATION mode, from 1 to 4294967295.
ntp authentication-key number md5 key
System management
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