(Optional) Configuring the Multicast Mode

Procedure

• Configure an NTP multicast server.
  1. Run system-view

     The system view is displayed.

  2. Run ntp-service authentication-keyid key-id authentication-mode { md5 | hmac-sha256 } { password | [ cipher ] password }

     The NTP authentication key is set.

     As the HMAC-SHA256 algorithm security is higher than that of the MD5 algorithm, using the HMAC-SHA256 algorithm for NTP authentication is recommended.

  3. Run interface interface-type interface-number

     The view of the interface sending NTP multicast messages is displayed.

  4. Run ntp-service multicast-server [ ip-address ] [ authentication-keyid key-id | ttl ttl-number | version number | port port-number ] ^* or ntp-service multicast-server [ ipv6 ipv6-address ] [ authentication-keyid key-id | ttl ttl-number | port port-number ] ^*

     The router is configured as an NTP multicast server.

     The NTP multicast server periodically sends clock-synchronization packets to the configured multicast IP address.

  5. Run commit

     The configuration is committed.

• Configure an NTP multicast client.
  1. Run system-view

     The system view is displayed.

  2. (Optional) Run ntp-service max-dynamic-sessions number

     The number of dynamic sessions allowed to be set up is set.

     Running the ntp-service max-dynamic-sessions command does not affect existing NTP sessions. When the number of sessions reaches the maximum number, no more session can be set up.

  3. Run interface interface-type interface-number

     The view of the interface receiving NTP multicast messages is displayed.

  4. Run ntp-service multicast-client [ ip-address | ipv6 ipv6-address ]

     The router is configured as an NTP multicast client.

     The NTP multicast client listens to the multicast NTP packets sent from the server and synchronizes the local clock.

  5. Run commit

     The configuration is committed.