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Time Protocols

Overview

This chapter describes:

■ SNTP Time Protocol Operation

■ Timep Time Protocol Operation

Using time synchronization ensures a uniform time among interoperating

devices. This helps you to manage and troubleshoot switch operation by

attaching meaningful time data to event and error messages.

The switch offers TimeP and SNTP (Simple Network Time Protocol) and a

timesync command for changing the time protocol selection (or turning off

time protocol operation).

Notes ■ Although you can create and save configurations for both time proto-

cols without conflicts, the switch allows only one active time protocol

at any time.

■ In the factory-default configuration, the time synchronization option

is set to TimeP, with the TimeP mode itself set to Disabled.

TimeP Time Synchronization

You can either manually assign the switch to use a TimeP server or use DHCP

to assign the TimeP server. In either case, the switch can get its time synchro-

nization updates from only one, designated Timep server. This option

enhances security by specifying which time server to use.

SNTP Time Synchronization

SNTP provides two operating modes:

■ Broadcast Mode: The switch acquires time updates by accepting the

time value from the first SNTP time broadcast detected. (In this case,

the SNTP server must be configured to broadcast time updates to the

network broadcast address. Refer to the documentation provided

with your SNTP server application.) Once the switch detects a partic-

ular server, it ignores time broadcasts from other SNTP servers unless

the configurable Poll Interval expires three consecutive times without

an update received from the first-detected server.

9-2

HP PROCURVE 2520 User Manual

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