958
C
HAPTER
77: NTP C
ONFIGURATION
n
The access-control right mechanism provides only a minimum degree of security
protection for the system running NTP. A more secure method is identity
authentication.
Configuring NTP
Authentication
The NTP authentication feature should be enabled for a system running NTP in a
network where there is a high security demand. This feature enhances the
network security by means of client-server key authentication, which prohibits a
client from synchronizing with a switch that has failed authentication.
Configuration
Prerequisites
The configuration NTP authentication involves configuration tasks to be
implemented on the client and on the server.
When configuring the NTP authentication feature, pay attention to the following
principles:
■
For all synchronization modes, when you enable the NTP authentication
feature, you should configure an authentication key and specify it as a trusted
key. Namely, the
ntp-service authentication enable
command must work
together with the
ntp-service authentication-keyid
command and the
ntp-service reliable authentication-keyid
command. Otherwise, the NTP
authentication function cannot be normally enabled.
■
For the server/client mode or symmetric mode, you need to associate the
specified authentication key on the client (symmetric-active peer if in the
symmetric peer mode) with the corresponding NTP server (symmetric-passive
peer if in the symmetric peer mode). Otherwise, the NTP authentication feature
cannot be normally enabled.
■
For the broadcast server mode or multicast server mode, you need to associate
the specified authentication key on the broadcast server or multicast server
with the corresponding NTP server. Otherwise, the NTP authentication feature
cannot be normally enabled.
■
For the server/client mode, if the NTP authentication feature has not been
enabled for the client, the client can synchronize with the server regardless the
NTP authentication feature has been enabled for the server or not.
■
For all synchronization modes, the server side and the client side must be
consistently configured.
■
If the NTP authentication is enabled on a client, the client can be synchronized
only to a server that can provide a trusted authentication key.
Configuration Procedure
Configuring NTP authentication for a client
Follow these steps to configure NTP authentication for a client:
To do…
Use the command…
Remarks
Enter system view
system-view
-
Enable NTP
authentication
ntp-service authentication enable
Required
Disabled by default
Configure an NTP
authentication key
ntp-service authentication-keyid
keyid
authentication-mode md5
value
Required
No NTP authentication key by
default
Summary of Contents for 4800G Series
Page 26: ...26 CHAPTER NETWORKING APPLICATIONS ...
Page 30: ...30 CHAPTER 1 LOGGING IN TO AN ETHERNET SWITCH ...
Page 62: ...62 CHAPTER 3 LOGGING IN THROUGH TELNET ...
Page 70: ...70 CHAPTER 5 LOGGING IN THROUGH WEB BASED NETWORK MANAGEMENT SYSTEM ...
Page 72: ...72 CHAPTER 6 LOGGING IN THROUGH NMS ...
Page 82: ...82 CHAPTER 8 CONTROLLING LOGIN USERS ...
Page 98: ...98 CHAPTER 9 VLAN CONFIGURATION ...
Page 108: ...108 CHAPTER 10 VOICE VLAN CONFIGURATION ...
Page 119: ...GVRP Configuration Examples 119 DeviceB display vlan dynamic No dynamic vlans exist ...
Page 120: ...120 CHAPTER 11 GVRP CONFIGURATION ...
Page 160: ...160 CHAPTER 17 PORT ISOLATION CONFIGURATION ...
Page 172: ...172 CHAPTER 19 LINK AGGREGATION CONFIGURATION ...
Page 196: ...196 CHAPTER 22 DLDP CONFIGURATION ...
Page 240: ...240 CHAPTER 23 MSTP CONFIGURATION ...
Page 272: ...272 CHAPTER 27 RIP CONFIGURATION ...
Page 364: ...364 CHAPTER 29 IS IS CONFIGURATION ...
Page 426: ...426 CHAPTER 31 ROUTING POLICY CONFIGURATION ...
Page 442: ...442 CHAPTER 33 IPV6 RIPNG CONFIGURATION ...
Page 466: ...466 CHAPTER 35 IPV6 IS IS CONFIGURATION ...
Page 488: ...488 CHAPTER 36 IPV6 BGP CONFIGURATION ...
Page 498: ...498 CHAPTER 37 ROUTING POLICY CONFIGURATION ...
Page 540: ...540 CHAPTER 40 TUNNELING CONFIGURATION ...
Page 552: ...552 CHAPTER 41 MULTICAST OVERVIEW ...
Page 604: ...604 CHAPTER 43 MLD SNOOPING CONFIGURATION ...
Page 628: ...628 CHAPTER 46 IGMP CONFIGURATION ...
Page 700: ...700 CHAPTER 48 MSDP CONFIGURATION ...
Page 812: ...812 CHAPTER 57 DHCP SERVER CONFIGURATION ...
Page 822: ...822 CHAPTER 58 DHCP RELAY AGENT CONFIGURATION ...
Page 834: ...834 CHAPTER 61 BOOTP CLIENT CONFIGURATION ...
Page 850: ...850 CHAPTER 63 IPV4 ACL CONFIGURATION ...
Page 856: ...856 CHAPTER 64 IPV6 ACL CONFIGURATION ...
Page 860: ...860 CHAPTER 65 QOS OVERVIEW ...
Page 868: ...868 CHAPTER 66 TRAFFIC CLASSIFICATION TP AND LR CONFIGURATION ...
Page 888: ...888 CHAPTER 69 PRIORITY MAPPING ...
Page 894: ...894 CHAPTER 71 TRAFFIC MIRRORING CONFIGURATION ...
Page 904: ...904 CHAPTER 72 PORT MIRRORING CONFIGURATION ...
Page 930: ...930 CHAPTER 74 UDP HELPER CONFIGURATION ...
Page 990: ...990 CHAPTER 79 FILE SYSTEM MANAGEMENT CONFIGURATION ...
Page 1000: ...1000 CHAPTER 80 FTP CONFIGURATION ...
Page 1020: ...1020 CHAPTER 82 INFORMATION CENTER CONFIGURATION ...
Page 1038: ...1038 CHAPTER 84 SYSTEM MAINTAINING AND DEBUGGING ...
Page 1046: ...1046 CHAPTER 85 DEVICE MANAGEMENT ...
Page 1129: ...SSH Client Configuration Examples 1129 SwitchB ...
Page 1130: ...1130 CHAPTER 88 SSH CONFIGURATION ...
Page 1160: ...1160 CHAPTER 90 RRPP CONFIGURATION ...
Page 1180: ...1180 CHAPTER 91 PORT SECURITY CONFIGURATION ...
Page 1192: ...1192 CHAPTER 92 LLDP CONFIGURATION ...
Page 1202: ...1202 CHAPTER 93 POE CONFIGURATION ...
Page 1218: ...1218 CHAPTER 96 HTTPS CONFIGURATION ...