Managing NTP Broadcast Server Support

An NTP broadcast server sends periodic time updates to a broadcast address in a LAN. When a broadcast client is configured for NTP, that client can receive time information from the broadcasted NTP packets. Using broadcast packets can greatly reduce the NTP traffic on a network, especially in a network with many NTP clients.

To ensure that NTP broadcast clients get clock information from the correct NTP broadcast servers, with minimized risks from malicious NTP broadcast attacks, configure RSA Data Security, Inc. MD5 (Message-Digest algorithm 5) Message-Digest Algorithm authentication on both the NTP broadcast server and NTP clients.

To configure an NTP broadcast server over a VLAN (Virtual LAN) where NTP broadcast service is provided, use the following command:
enable ntp {vlan} vlan-name broadcast-server {key keyid}
To delete an NTP broadcast server over a VLAN where NTP broadcast service is enabled, use the following command:
disable ntp {vlan} vlan-name broadcast-server
To display an NTP broadcast server, use the following command:
show ntp server

show ntp vlan {{vr} vr_name}

Published March 2020prev | next

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