H3C H3C S5600 Series Operation Manual - page 5
Operation Manual – NTP
H3C S5600 Series Ethernet Switches-Release 1510
Chapter 1 NTP Configuration
1-4
e peer
II. Peer mode
Active peer
Passiv
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
In peer mode, both
sides are synchronized
to the clock with
smaller stratum
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
Active peer
Passive peer
Netw ork
Clock synchronization
request packet
Oper
peer m
ates in the passive
ode automatically
Netw ork
Response packet
Synchronize
In peer mode, both
sides are synchronized
to the clock with
smaller stratum
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
Netw ork
Client
Server
Broadcast clock synchronization
packets periodically
Client/Server mode request
Initiate a clien
request after
first broadcas
t/server mode
receiving the
t packet
Response packet
Obtain the de
client and the
a client in bro
lay betw een the
server and w ork as
adcast mode
Broadcast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Receive broa
synchronize it
dcast packets and
s local clock
Netw ork
Client
Server
Broadcast clock synchronization
packets periodically
request after
first broadcas
receiving the
t packet
Response packet
Obtain the de
client and the
lay betw een the
server and w ork as
Broadcast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Receive broa
synchronize it
dcast packets and
s local clock
Netw ork
Client
Server
Broadcast clock synchronization
packets periodically
Client/Server mode request
Initiate a clien
request after
first broadcas
t/server mode
receiving the
t packet
Response packet
Obtain the de
client and the
a client in bro
lay betw een the
server and w ork as
adcast mode
Broadcast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Receive broa
synchronize it
dcast packets and
s local clock
Netw ork
Client
Server
Broadcast clock synchronization
packets periodically
request after
first broadcas
receiving the
t packet
Response packet
Obtain the de
client and the
lay betw een the
server and w ork as
Broadcast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Receive broa
synchronize it
dcast packets and
s local clock
e
Figure 1-4 NTP implementation mode: broadcast mod
IV. Multicast mode
Netw ork
Client
Server
Multicast clock synchronization
packets periodically
Client/Server model request
Initiate a cli
request af
first multica
ent/server mode
ter receiving the
st packet
Response packet
Multicast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Obtain the
client and th
as a client i
Receive mu
synchroniz
delay betw een the
e server and work
n multicast mode
lticast packets and
e its local clock
Netw ork
Client
Server
Multicast clock synchronization
packets periodically
Client/Server model request
request af
first multica
ter receiving the
st packet
Response packet
Multicast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Obtain the
client and th
Receive mu
synchroniz
delay betw een the
e server and work
lticast packets and
e its local clock
Netw ork
Client
Server
Multicast clock synchronization
packets periodically
Client/Server model request
Initiate a cli
request af
first multica
ent/server mode
ter receiving the
st packet
Response packet
Multicast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Obtain the
client and th
as a client i
Receive mu
synchroniz
delay betw een the
e server and work
n multicast mode
lticast packets and
e its local clock
Netw ork
Client
Server
Multicast clock synchronization
packets periodically
Client/Server model request
request af
first multica
ter receiving the
st packet
Response packet
Multicast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Obtain the
client and th
Receive mu
synchroniz
delay betw een the
e server and work
lticast packets and
e its local clock
e
Figure 1-5 NTP implementation mode: multicast mod
Table 1-1 describes how the above mentioned NTP modes are implemented on an
S5600 series switch.