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Managing the System Time and Date
Configuring NTP
The switch does not have a hardware-supported clock and cannot function as an NTP master clock to
which peers synchronize themselves when an external NTP source is not available. The switch also has
no hardware support for a calendar. As a result, the ntp update-calendar and the ntp master global
configuration commands are not available.
This section contains this configuration information:
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Default NTP Configuration
Table 7-1
Table 7-1
Feature
NTP authentication
NTP peer or server associations
NTP broadcast service
NTP access restrictions
NTP packet source IP address
NTP is enabled on all interfaces by default. All interfaces receive NTP packets.
Catalyst 3750 Switch Software Configuration Guide
7-4
Default NTP Configuration, page 7-4
Configuring NTP Authentication, page 7-5
Configuring NTP Associations, page 7-6
Configuring NTP Broadcast Service, page 7-7
Configuring NTP Access Restrictions, page 7-8
Configuring the Source IP Address for NTP Packets, page 7-10
Displaying the NTP Configuration, page 7-11
shows the default NTP configuration.
Default NTP Configuration
Default Setting
Disabled. No authentication key is specified.
None configured.
Disabled; no interface sends or receives NTP broadcast packets.
No access control is specified.
The source address is set by the outgoing interface.
Chapter 7
Administering the Switch
78-16180-02
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