H3C Technologies H3C S3100 Series Switches - Manual (Page 466)

Operation Manual – NTP
H3C S3100-52P Ethernet Switch Chapter 1 NTP Configuration
1-4
1.1.3 NTP Implementation Modes
According to the network structure and the position of the local Ethernet switch in the
network, the local Ethernet switch can work in multiple NTP modes to synchronize the
clock.
I. Client/server mode
Network
Client Server
Clock synchronization
request packet
Response packet
Filters and selects
a clocks and
synchronize the
local clock to that of
the preferred server
W
au
a
orks in server mode
tomatically and send
response packet
Network Network Network
Figure 1-2
Client/sever mode
II. Peer mode
Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network Network
Clock synchronization
request packet
Network Network Network Network Network Network Network Network Network
Active peer
Network Network
Works in passive peer
mode automatically
sive peer
e
Pas
Response packet
Synchronize
In peer mode, both
sides can be
synchronized to each
other
Figure 1-3
Peer mod
In the peer mode, the local S3100-52P Ethernet switch serves as the active peer and
sends clock synchronization request packets first, while the remote server serves as
the passive peer automatically.
If both of the peers have reference clocks, the one with a smaller stratum number is
adopted.