Configuring Ntp; Default Ntp Configuration - Cisco Catalyst 3750 Software Configuration Manual

Managing the System Time and Date

Configuring NTP

The switches do not have a hardware-supported clock, and they cannot function as an NTP master clock
to which peers synchronize themselves when an external NTP source is not available. These switches
also have 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 5-1
Table 5-1
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 Metro Switch Software Configuration Guide
5-4
Default NTP Configuration, page 5-4
Configuring NTP Authentication, page 5-5
Configuring NTP Associations, page 5-6
Configuring NTP Broadcast Service, page 5-7
Configuring NTP Access Restrictions, page 5-8
Configuring the Source IP Address for NTP Packets, page 5-10
Displaying the NTP Configuration, page 5-11
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 determined by the outgoing interface.
Chapter 5 Administering the Switch
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