Cisco Catalyst 3550 Series User Manual

7-3
Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-09
Chapter 7 Administering the Switch
Managing the System Time and Date
Several manufacturers include NTP software for their host systems, and a publicly available version for
systems running UNIX and its various derivatives is also available. This software allows host systems to
be time-synchronized as well.
Figure 7-1 Typical NTP Network Configuration
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:
• Default NTP Configuration, page 7-4
• Configuring NTP Authentication, page 7-4
• Configuring NTP Associations, page 7-5
• Configuring NTP Broadcast Service, page 7-6
• Configuring NTP Access Restrictions, page 7-7
• Configuring the Source IP Address for NTP Packets, page 7-9
• Displaying the NTP Configuration, page 7-10
Catalyst 2950, 2955,
or 3550 switch
Catalyst 2950 or
3550 switch
Catalyst 2950 or
3550 switch
Catalyst 2950, 2955,
or 3550 switch
These switches are configured in
NTP server mode (server association)
with the Catalyst 6500 series switch.
Catalyst 6500
series switch
(NTP master)
This switch is configured as an NTP
peer to the upstream and downstream
Catalyst 3550 switches.
Catalyst 2950, 2955,
or 3550 switch
Workstations
Workstations
Local
workgroup
servers
74722

Cisco Catalyst 3550 Series Specifications

General

Brand	Cisco
Model	Catalyst 3550 Series
Category	Network Router
Language	English