Access Control Permission Configuration; Ntp Authentication Configuration - H3C S5600 series Operation Manual

Operation Manual – NTP
H3C S5600 Series Ethernet Switches-Release 1510
IV. NTP multicast server mode
When an S5600 series switch operates in NTP multicast server mode, it multicasts a
clock synchronization packet periodically. The devices which are configured to be in the
NTP multicast client mode will response this packet and start the clock synchronization
procedure. In this mode, the switch can accommodate up to 1024 multicast clients.
Note:
The total number of the servers and peers configured for a switch can be up to 128.
After the configuration, the S5600 series switch 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 an S5600 series switch 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.

1.3 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.
Table 1-3 Configure the access control permission to the local NTP server
Operation
Enter system view
Configure
access
permission to the
local NTP server

1.4 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.
Command
system-view
the
ntp-service access { peer |
control
server | synchronization |
query } acl-number
1-8
Chapter 1 NTP Configuration
Description
—
Optional
By default, the access control
permission to the local NTP
server is peer