.NODE

Setting the Clock Period

Problem

You want to improve on the default value in the ntp clock-period xxxxxx command that automatically appears when you configure NTP on your router.

Solution

The router automatically generates a ntp clock-period line that it uses to help speed resynchronization after a reboot. Leave it alone:

Router#show running-config | include clock-period
ntp clock-period 17180200
Router#

Do not attempt to remove or modify the ntp clock-period command. The router automatically generates this command to compensate for internal timer inaccuracies.

Discussion

Do not modify or remove this statement from the router configuration. The router automatically adds this statement to the configuration when you enable NTP. After initialization of NTP, the router tunes the clock period to compensate for precision problems with the router's internal clock.

The router will actually constantly change the NTP clock period. For this reason, Cisco suggests that all routers have their configurations saved to NVRAM one week after enabling NTP. This ensures that the saved clock period is accurate for the next router initialization and allows for quicker NTP synchronization.

Router Configuration and File Management

Router Management

User Access and Privilege Levels

TACACS+

IP Routing

RIP

EIGRP

OSPF

BGP

Frame Relay

Handling Queuing and Congestion

Tunnels and VPNs

Dial Backup

NTP and Time

DLSw

Router Interfaces and Media

Simple Network Management Protocol

Logging

Access-Lists

DHCP

NAT

First Hop Redundancy Protocols

IP Multicast

IP Mobility

IPv6

MPLS

Security

Appendix 1. External Software Packages

Appendix 2. IP Precedence, TOS, and DSCP Classifications

Index

show all menu





Cisco IOS Cookbook
Cisco IOS Cookbook (Cookbooks (OReilly))
ISBN: 0596527225
EAN: 2147483647
Year: 2004
Pages: 505
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