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Configuring the NTP Time Server and Time Services

When you use NTP, configure the router or switch to operate in one of the following modes:

  • Client mode
  • Symmetric active mode
  • Broadcast mode
  • Server mode

The following topics describe how to configure these modes of operation:

  1. Configuring the Router or Switch to Operate in Client Mode
  2. Configuring the Router or Switch to Operate in Symmetric Active Mode
  3. Configuring the Router or Switch to Operate in Broadcast Mode
  4. Configuring the Router or Switch to Operate in Server Mode

Configuring the Router or Switch to Operate in Client Mode

To configure the local router or switch to operate in client mode, include the server statement and other optional statements at the [edit system ntp] hierarchy level:

[edit system ntp]server address <key key-number> <version value> <prefer>; authentication-key key-number type type value password;boot-server address;trusted-key [ key-numbers ];

Specify the address of the system acting as the time server. You must specify an address, not a hostname.

To include an authentication key in all messages sent to the time server, include the key option. The key corresponds to the key number you specify in the authentication-key statement, as described in Configuring NTP Authentication Keys.

By default, the router or switch sends NTP version 4 packets to the time server. To set the NTP version level to 1, 2, or 3 include the version option.

If you configure more than one time server, you can mark one server preferred by including the prefer option.

For information about how to configure trusted keys, see Configuring NTP Authentication Keys. For information about how to configure an NTP boot server, see Synchronizing and Coordinating Time Distribution Using NTP. For information about how to configure the router or switch to operate in server mode, see Configuring the Router or Switch to Operate in Server Mode.

The following example shows how to configure the router or switch to operate in client mode:

[edit system ntp]authentication-key 1 type md5 value "$9$EgfcrvX7VY4ZEcwgoHjkP5Q3CuREyv87";boot-server 10.1.1.1;server 10.1.1.1 key 1 prefer;trusted-key 1;

Configuring the Router or Switch to Operate in Symmetric Active Mode

To configure the local router or switch to operate in symmetric active mode, include the peer statement at the [edit system ntp] hierarchy level:

[edit system ntp]peer address <key key-number> <version value> <prefer>;

Specify the address of the remote system. You must specify an address, not a hostname.

To include an authentication key in all messages sent to the remote system, include the key option. The key corresponds to the key number you specify in the authentication-key statement, as described in Configuring NTP Authentication Keys.

By default, the router or switch sends NTP version 4 packets to the remote system. To set the NTP version level to 1, 2 or 3, include the version option.

If you configure more than one remote system, you can mark one system preferred by including the prefer option:

peer address <key key-number> <version value> prefer;

Configuring the Router or Switch to Operate in Broadcast Mode

To configure the local router or switch to operate in broadcast mode, include the broadcast statement at the [edit system ntp] hierarchy level:

[edit system ntp]broadcast address <key key-number> <version value> <ttl value>;

Specify the broadcast address on one of the local networks or a multicast address assigned to NTP. You must specify an address, not a hostname. If the multicast address is used, it must be 224.0.1.1.

To include an authentication key in all messages sent to the remote system, include the key option. The key corresponds to the key number you specify in the authentication-key statement, as described in Configuring NTP Authentication Keys.

By default, the router or switch sends NTP version 4 packets to the remote system. To set the NTP version level to 1, 2, or 3, include the version option.

Configuring the Router or Switch to Operate in Server Mode

In server mode, the router or switch acts as an NTP server for clients when the clients are configured appropriately. The only prerequisite for “ server mode” is that the router or switch must be receiving time from another NTP peer or server. No other configuration is necessary on the router or switch.

To configure the local router or switch to operate as an NTP server, include the following statements at the [edit system ntp] hierarchy level:

[edit system ntp]authentication-key key-number type type value password;server address <key key-number> <version value> <prefer>; trusted-key [ key-numbers ];

Specify the address of the system acting as the time server. You must specify an address, not a hostname.

To include an authentication key in all messages sent to the time server, include the key option. The key corresponds to the key number you specify in the authentication-key statement, as described in Configuring NTP Authentication Keys.

By default, the router or switch sends NTP version 4 packets to the time server. To set the NTP version level to 1,or 2, or 3, include the version option.

If you configure more than one time server, you can mark one server preferred by including the prefer option.

For information about how to configure trusted keys, see Configuring NTP Authentication Keys. For information about how to configure the router or switch to operate in client mode, see Configuring the Router or Switch to Operate in Client Mode.

The following example shows how to configure the router or switch to operate in server mode:

[edit system ntp]authentication-key 1 type md5 value "$9$txERuBEreWx-wtuLNdboaUjH.T3AtOESe";server 172.17.27.46 prefer;trusted-key 1;

Published: 2010-04-26

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