Huawei Quidway S3900 Series Operation Manual page 800

Operation Manual -- NTP
Quidway S3900 Series Ethernet Switches-Release 1510
III. Broadcast mode
Work as a server Work as a server Work as a server Work as a server
automatically and automatically and automatically and automatically and
send response send response send response send response
packets packets packets packets
Figure 1-4 NTP implementation mode: broadcast mode
IV. Multicast mode
Work as a server Work as a server Work as a server Work as a server
automatically and automatically and automatically and automatically and
send response send response send response send response
packets packets packets packets
Figure 1-5 NTP implementation mode: multicast mode
Table 1-1 describes how the above mentioned NTP modes are implemented on an
S3900 series switch.
Table 1-1 NTP implementation modes on an S3900 series switch
NTP implementation mode
Client/Server mode
Peer mode
Server Server Server Server
Netw ork Netw ork Netw ork Netw ork
Broadcast clock synchronization Broadcast clock synchronization Broadcast clock synchronization Broadcast clock synchronization
packets periodically packets periodically packets periodically packets periodically
Client/Server mode request Client/Server mode request
Response packet Response packet Response packet Response packet
Broadcast clock synchronization Broadcast clock synchronization Broadcast clock synchronization Broadcast clock synchronization
packets periodically packets periodically packets periodically packets periodically
Server Server Server Server
Netw ork Netw ork Netw ork Netw ork
Multicast clock synchronization Multicast clock synchronization Multicast clock synchronization Multicast clock synchronization
packets periodically packets periodically packets periodically packets periodically
Client/Server model request Client/Server model request Client/Server model request Client/Server model request
Response packet Response packet Response packet Response packet
Multicast clock synchronization Multicast clock synchronization Multicast clock synchronization Multicast clock synchronization
packets periodically packets periodically packets periodically packets periodically
Huawei Technologies Proprietary
Client Client Client Client
Initiate a client/server mode Initiate a client/server mode
request after receiving the request after receiving the request after receiving the request after receiving the
first broadcast packet first broadcast packet first broadcast packet first broadcast packet
Obtain the delay betw een the Obtain the delay betw een the Obtain the delay betw een the Obtain the delay betw een the
client and the server and w ork as client and the server and w ork as client and the server and w ork as client and the server and w ork as
a client in broadcast mode a client in broadcast mode
Receive broadcast packets and Receive broadcast packets and Receive broadcast packets and Receive broadcast packets and
synchronize its local clock synchronize its local clock synchronize its local clock synchronize its local clock
Client Client Client Client
Initiate a client/server mode Initiate a client/server mode
request after receiving the request after receiving the request after receiving the request after receiving the
first multicast packet first multicast packet first multicast packet first multicast packet
Obtain the delay betw een the Obtain the delay betw een the Obtain the delay betw een the Obtain the delay betw een the
client and the server and work client and the server and work client and the server and work client and the server and work
as a client in multicast mode as a client in multicast mode
Receive multicast packets and Receive multicast packets and Receive multicast packets and Receive multicast packets and
synchronize its local clock synchronize its local clock synchronize its local clock synchronize its local clock
Configuration on S3900 switches
Configure the S3900 switch to operate in the
NTP server mode. In this case, the remote
server operates as the local time server, and
the S3900 switch operates as the client.
Configure the S3900 switch to operate in NTP
peer mode. In this case, the remote server
operates as the peer of the S3900 switch, and
the S3900 switch operates as the active peer.
1-5
Chapter 1 NTP Configuration