Configure A Source Ip Address For Ntp Packets; Configure Ntp Authentication - Dell Force10 Z9000 Configuration Manual

Configure a source IP address for NTP packets

By default, the source address of NTP packets is the IP address of the interface used to reach the network.
You can configure one interface's IP address to be included in all NTP packets.
To configure an IP address as the source address of NTP packets, use the following command in the
CONFIGURATION mode:
Command Syntax
ntp source interface
To view the configuration, use the
mode.

Configure NTP authentication

NTP authentication and the corresponding trusted key provide a reliable means of exchanging NTP
packets with trusted time sources. NTP authentication begins when the first NTP packet is created
following the configuration of keys. NTP authentication in FTOS uses the MD5 algorithm and the key is
embedded in the synchronization packet that is sent to an NTP time source.
FTOS Behavior: FTOS versions 8.2.1.0 and later use an encryption algorithm to store the
authentication key that is different from previous FTOS versions; beginning in version 8.2.1.0, FTOS
uses DES encryption to store the key in the startup-config when you enter the command ntp
authentication-key. Therefore, if your system boots with a startup-configuration from an FTOS versions
prior to 8.2.1.0 in which you have configured ntp authentication-key, the system cannot correctly
decrypt the key, and cannot authenticate NTP packets. In this case you must re-enter this command
and save the running-config to the startup-config.
| System Time and Date
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Command Mode Purpose
CONFIGURATION Enter the following keywords and slot/port or number information:
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show running-config ntp
For a 1-Gigabit Ethernet interface, enter the keyword
GigabitEthernet followed by the slot/port information.
For a loopback interface, enter the keyword loopback followed by a
number between 0 and 16383.
For a port channel interface, enter the keyword lag followed by a
number from 1 to 255 for TeraScale and ExaScale.
For a SONET interface, enter the keyword sonet followed by the
slot/port information.
For a 10-Gigabit Ethernet interface, enter the keyword
TenGigabitEthernet followed by the slot/port information.
For a VLAN interface, enter the keyword vlan followed by a number
from 1 to 4094.
For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE
followed by the slot/port information.
command (Figure 38) in the EXEC privilege