3Com 5500G-EI Command Reference Guide - Page 509

NTP Configuration Commands 509 Designate an interface on the local equipment to transmit NTP multicast packet. The local equipment operates in multicast-server mode and multicasts packets regularly to its clients. Example Configure to transmit NTP multicast packets encrypted with Key 4 via Vlan-Interface1 at 224.0.1.1 and use NTP version 3. system-view System View: return to User View with Ctrl+Z. [SW5500]interface vlan-interface 1 [SW5500-Vlan-Interface1]ntp-service multicast-server 224.0.1.1 authentication-keyid 4 version 3 ntp-service reliable Syntax authentication-keyid ntp-service reliable authentication-keyid number undo ntp-service reliable authentication-keyid number View System view Parameter number: Specify the key number, ranging from 1 to 4294967295. Description Use the ntp-service reliable authentication-keyid command to configure the key as reliable. Use the undo ntp-service reliable authentication-keyid command to cancel the current setting. By default, no key is configured as reliable. When you enable the authentication to use this command to configure one or more than one key as reliable. In this case, a client will only get synchronized by a server whichever can provide a reliable key. Example Enable NTP authentication, adopt MD5 encryption, and designate Key 37 BetterKey and configure it as reliable. system-view System View: return to User View with Ctrl+Z. [SW5500]ntp-service authentication enable [SW5500]ntp-service authentication-keyid 37 authentication-mode md5 BetterKey [SW5500]ntp-service reliable authentication-keyid 37 ntp-service source-interface Syntax ntp-service source-interface { interface-name | interface-type interface-number } undo ntp-service source-interface