H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – NTP
H3C S7500 Series Ethernet Switches Chapter 1
NTP Configuration
1-4
II. Peer mode
Passive peer
Clock synchronization
request packet
Synchronize
Network
Active peer
W
m
In peer mode, both sides
can be synchronized to
each other
orks in passive peer
ode automatically
Response packet
Figure 1-3 NTP implementation mode: peer mode
In peer mode, the active peer sends clock synchronization packets first, and its peer
works as a passive peer automatically.
If both of the peers have reference clocks, the one with smaller stratum is adopted.
III. Broadcast mode
Client
Broadcast clock synchronizati on
packets periodically
Network
Server
Initiates a c
request af
first broadca
Works in the server mode
automatically and sends
response packets
lient/server mode
ter receiving the
st packet
Client/server mode
reques
Response packet
Obtains th
client and s
the broadca
Receives br
synchronizes
Broadcast clock synchronizati on
packets periodically
e delay between the
erver and works in
st client mode
oadcast packets and
the local clock
e Figure 1-4 NTP implementation mode: broadcast mod
IV. Multicast mode
Client
Multicast clock synchronizati on
packets periodically
Network
Server
Initiates a c
request af
first multicas
Works in the server mode
automatically and sends
response packets
lient/server mode
ter receiving the
t packet
Client/server mode
reques
Response packet
Obtains the
client and s
the multicas
Receives mu
synchronizes
Multicast clock synchronization
packets periodically
delay between the
erver and works in
t client mode
lticast packets and
the local clock
e Figure 1-5 NTP implementation mode: multicast mod