Access Control Permission Configuration
759
NTP multicast client mode will respond this packet and start the clock
synchronization procedure. In this mode, the switch can accommodate up to
1,024 multicast clients.
n
■
The total number of the servers and peers configured for a switch can be up to
128.
■
After the configuration, the Switch 7750 does not establish connections with
the peer if it operates in NTP server mode. Whereas if it operates in any of the
other modes, it establishes connections with the peer.
■
If a Switch 7750 operates as a passive peer in peer mode, NTP broadcast client
mode, or NTP multicast client mode, the connections it establishes with the
peers are dynamic. If it operates in other modes, the connections it establishes
with the peers are static.
Access Control
Permission
Configuration
Access control permission to NTP server is a security measure that is of the
minimum extent. Authentication is more reliable comparing to it.
An access request made to an NTP server is matched from the highest permission
to the lowest, that is, in the order of
peer
,
server
,
synchronization
, and
query
.
NTP Authentication
Configuration
For the networks with higher security requirements, you can specify to perform
authentications when enabling NTP. With the authentications performed on both
the client side and the server side, the client is synchronized only to the server that
passes the authentication. This improves network security.
Prerequisites
NTP authentication configuration involves:
■
Configuring NTP authentication on the client
■
Configuring NTP authentication on the server
Note the following when performing NTP authentication configuration:
■
If the NTP authentication is not enabled on a client, the client can be
synchronized to a server regardless of the NTP authentication configuration
performed on the server (assuming that the related configurations are
performed).
■
You need to couple the NTP authentication with a trusted key.
■
The configurations performed on the server and the client must be the same.
■
A client with NTP authentication enabled is only synchronized to a server that
can provide a trusted key.
Table 603
Configure the access control permission to the local NTP server
Operation Command
Description
Enter system view
system-view
-
Configure the access
control permission to
the local NTP server
ntp-service access
{
peer
|
server
|
synchronization
|
query
}
acl-number
Optional
By default, the access control
permission to the local NTP server
is
peer
Summary of Contents for Switch 7754
Page 32: ...32 CHAPTER 1 CLI OVERVIEW ...
Page 70: ...70 CHAPTER 5 LOGGING IN USING MODEM ...
Page 76: ...76 CHAPTER 7 LOGGING IN THROUGH NMS ...
Page 86: ...86 CHAPTER 9 CONFIGURATION FILE MANAGEMENT ...
Page 120: ...120 CHAPTER 13 ISOLATE USER VLAN CONFIGURATION ...
Page 126: ...126 CHAPTER 14 SUPER VLAN ...
Page 136: ...136 CHAPTER 16 IP PERFORMANCE CONFIGURATION ...
Page 152: ...152 CHAPTER 17 IPX CONFIGURATION ...
Page 164: ...164 CHAPTER 19 QINQ CONFIGURATION ...
Page 172: ...172 CHAPTER 21 SHARED VLAN CONFIGURATION ...
Page 182: ...182 CHAPTER 22 PORT BASIC CONFIGURATION ...
Page 198: ...198 CHAPTER 24 PORT ISOLATION CONFIGURATION ...
Page 208: ...208 CHAPTER 25 PORT SECURITY CONFIGURATION ...
Page 224: ...224 CHAPTER 27 DLDP CONFIGURATION ...
Page 232: ...232 CHAPTER 28 MAC ADDRESS TABLE MANAGEMENT ...
Page 240: ...240 CHAPTER 29 CENTRALIZED MAC ADDRESS AUTHENTICATION CONFIGURATION ...
Page 280: ...280 CHAPTER 30 MSTP CONFIGURATION ...
Page 348: ...348 CHAPTER 35 IS IS CONFIGURATION ...
Page 408: ...408 CHAPTER 39 802 1X CONFIGURATION ...
Page 412: ...412 CHAPTER 40 HABP CONFIGURATION ...
Page 422: ...422 CHAPTER 41 MULTICAST OVERVIEW ...
Page 426: ...426 CHAPTER 42 GMRP CONFIGURATION ...
Page 480: ...480 CHAPTER 47 PIM CONFIGURATION ...
Page 506: ...506 CHAPTER 48 MSDP CONFIGURATION ...
Page 552: ...552 CHAPTER 51 TRAFFIC ACCOUNTING CONFIGURATION ...
Page 570: ...570 CHAPTER 53 HA CONFIGURATION ...
Page 582: ...582 CHAPTER 54 ARP CONFIGURATION SwitchA arp protective down recover interval 200 ...
Page 622: ...622 CHAPTER 58 DHCP RELAY AGENT CONFIGURATION ...
Page 684: ...684 CHAPTER 61 QOS CONFIGURATION ...
Page 718: ...718 CHAPTER 63 CLUSTER ...
Page 738: ...738 CHAPTER 67 UDP HELPER CONFIGURATION ...
Page 752: ...752 CHAPTER 69 RMON CONFIGURATION ...
Page 772: ...772 CHAPTER 70 NTP CONFIGURATION ...
Page 796: ...796 CHAPTER 72 FILE SYSTEM MANAGEMENT ...
Page 802: ...802 CHAPTER 73 BIMS CONFIGURATION ...
Page 814: ...814 CHAPTER 74 FTP AND TFTP CONFIGURATION ...
Page 830: ...830 CHAPTER 75 INFORMATION CENTER ...
Page 836: ...836 CHAPTER 76 DNS CONFIGURATION ...
Page 852: ...852 CHAPTER 77 BOOTROM AND HOST SOFTWARE LOADING ...
Page 858: ...858 CHAPTER 78 BASIC SYSTEM CONFIGURATION DEBUGGING ...