Configuring Ntp - Cisco WS-C3550-12G Software Configuration Manual

Managing the System Time and Date
Figure 6-3
Local
workgroup
servers
Workstations

Configuring NTP

The Catalyst 3550 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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Catalyst 3550 Multilayer Switch Software Configuration Guide
6-34
Typical NTP Network Configuration
Catalyst 3550
switch
Catalyst 3550
switch
Catalyst 3550
switch
Workstations
Default NTP Configuration, page 6-35
Configuring NTP Authentication, page 6-35
Configuring NTP Associations, page 6-36
Configuring NTP Broadcast Service, page 6-37
Configuring NTP Access Restrictions, page 6-38
Configuring the Source IP Address for NTP Packets, page 6-40
Displaying the NTP Configuration, page 6-41
These switches are configured in
NTP server mode (server association)
with the Catalyst 6500 series switch.
This switch is configured as an NTP
peer to the upstream and downstream
Catalyst 3550 switches.
Chapter 6 Administering the Switch
Catalyst 6500
series switch
(NTP master)
Catalyst 3550
switch
Catalyst 3550
switch
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