
Chapter 1
| Initial Switch Configuration
Setting the System Clock
– 69 –
Configuring NTP
Requesting the time from a an NTP server is the most secure method. You can
enable NTP authentication to ensure that reliable updates are received from only
authorized NTP servers. The authentication keys and their associated key number
must be centrally managed and manually distributed to NTP servers and clients.
The key numbers and key values must match on both the server and client.
When more than one time server is configured, the client will poll all of the time
servers, and compare the responses to determine the most reliable and accurate
time update for the switch.
To configure NTP time synchronization, enter commands similar to the following.
Console(config)#ntp client
Console(config)#ntp authentication-key 45 md5 thisiskey45
Console(config)#ntp authenticate
Console(config)#ntp server 192.168.3.20
Console(config)#ntp server 192.168.3.21
Console(config)#ntp server 192.168.5.23 key 19
Console(config)#exit
Console#show ntp
Current Time : Apr 29 13:57:32 2011
Polling : 1024 seconds
Current Mode : unicast
NTP Status : Enabled
NTP Authenticate Status : Enabled
Last Update NTP Server : 192.168.0.88 Port: 123
Last Update Time : Mar 12 02:41:01 2013 UTC
NTP Server 192.168.0.88 version 3
NTP Server 192.168.3.21 version 3
NTP Server 192.168.4.22 version 3 key 19
NTP Authentication Key 19 md5 42V68751663T6K11P2J307210R885
Current Time : Apr 2 16:28:34 2013
Polling : 1024 seconds
Current Mode : unicast
NTP Status : Enabled
NTP Authenticate Status : Enabled
Last Update NTP Server : 192.168.5.23 Port: 0
Last Update Time : Apr 2 16:00:00 2013 UTC
NTP Server 192.168.3.20 version 3
NTP Server 192.168.3.21 version 3
NTP Server 192.168.5.23 version 3 key 19
NTP Authentication Key 45 md5 2662T75S5658RU5424180034777
Console#
Содержание ECS4120-28F
Страница 36: ...Contents 36...
Страница 38: ...Figures 38...
Страница 46: ...Section I Getting Started 46...
Страница 70: ...Chapter 1 Initial Switch Configuration Setting the System Clock 70...
Страница 86: ...Chapter 2 Using the Command Line Interface CLI Command Groups 86...
Страница 202: ...Chapter 5 SNMP Commands Additional Trap Commands 202...
Страница 210: ...Chapter 6 Remote Monitoring Commands 210...
Страница 216: ...Chapter 7 Flow Sampling Commands 216...
Страница 278: ...Chapter 8 Authentication Commands PPPoE Intermediate Agent 278...
Страница 360: ...Chapter 9 General Security Measures Port based Traffic Segmentation 360...
Страница 384: ...Chapter 10 Access Control Lists ACL Information 384...
Страница 424: ...Chapter 11 Interface Commands Power Savings 424...
Страница 446: ...Chapter 13 Power over Ethernet Commands 446...
Страница 456: ...Chapter 14 Port Mirroring Commands RSPAN Mirroring Commands 456...
Страница 488: ...Chapter 17 UniDirectional Link Detection Commands 488...
Страница 494: ...Chapter 18 Address Table Commands 494...
Страница 554: ...Chapter 20 ERPS Commands 554...
Страница 620: ...Chapter 22 Class of Service Commands Priority Commands Layer 3 and 4 620...
Страница 638: ...Chapter 23 Quality of Service Commands 638...
Страница 772: ...Chapter 25 LLDP Commands 772...
Страница 814: ...Chapter 26 CFM Commands Delay Measure Operations 814...
Страница 826: ...Chapter 27 OAM Commands 826 1 1 00 12 CF 6A 07 F6 000084 Enabled Disabled Enabled Disabled Console...
Страница 836: ...Chapter 28 Domain Name Service Commands 836...
Страница 848: ...Chapter 29 DHCP Commands DHCP Relay Option 82 848...
Страница 902: ...Section III Appendices 902...
Страница 916: ...Glossary 916...
Страница 926: ...CLI Commands 926...
Страница 937: ......
Страница 938: ...E092017 CS R02...