3Com Switch 4200G Configuration Guide

294 CHAPTER 35: NTP CONFIGURATION
Broadcast mode
Figure 92 NTP implementation mode: broadcast mode
Multicast mode
Figure 93 NTP implementation mode: multicast mode
Table 256 describes how the above mentioned NTP modes are implemented on an
S4200G series switch.
Table 256 NTP implementation modes on an S4200G series switch
NTP implementation mode Configuration on S4200G switches
Client/Server mode Configure the S4200G switch to operate in the NTP
server mode. In this case, the remote server operates
as the local time server, and the S4200G switch
operates as the client.
Peer mode Configure the S4200G switch to operate in NTP peer
mode. In this case, the remote server operates as the
peer of the S4200G switch, and the S4200G switch
operates as the active peer.
Broadcast mode
■ Configure the S4200G switch to operate
in NTP broadcast server mode. In this case,
the S4200G switch broadcast NTP packets
through the VLAN interface configured on
it.
■ Configure the S4200G switch to operate
in NTP broadcast client mode. In this case,
the S4200G receives broadcast NTP
packets through the VLAN interface
configured on it.
Netw ork
ClientServer
Broadcast clock synchronization
packets periodically
Client/Server mode request
Initiate a client/server mode
request after receiving the
first broadcast packet
Response packet
Obtain the delay betw een the
client and the server and work as
a client in broadcast mode
Broadcast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Receive broadcast packets and
synchronize its local clock
Netw ork
ClientServer
Broadcast clock synchronization
packets periodically
request after receiving the
first broadcast packet
Response packet
Obtain the delay betw een the
client and the server and work as
Broadcast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Receive broadcast packets and
synchronize its local clock
Netw ork
ClientServer
Broadcast clock synchronization
packets periodically
Client/Server mode request
Initiate a client/server mode
request after receiving the
first broadcast packet
Response packet
Obtain the delay betw een the
client and the server and work as
a client in broadcast mode
Broadcast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Receive broadcast packets and
synchronize its local clock
Netw ork
ClientServer
Broadcast clock synchronization
packets periodically
request after receiving the
first broadcast packet
Response packet
Obtain the delay betw een the
client and the server and work as
Broadcast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Receive broadcast packets and
synchronize its local clock
Netw ork
ClientServer
Multicast clock synchronization
packets periodically
Client/Server model request
Initiate a client/server mode
request after receiving the
first multicast packet
Response packet
Multicast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Obtain the delay betw een the
client and the server and work
as a client in multicast mode
Receive multicast packets and
synchronize its local clock
Netw ork
ClientServer
Multicast clock synchronization
packets periodically
Client/Server model request
request after receiving the
first multicast packet
Response packet
Multicast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Obtain the delay betw een the
client and the server and work
Receive multicast packets and
synchronize its local clock
Netw ork
ClientServer
Multicast clock synchronization
packets periodically
Client/Server model request
Initiate a client/server mode
request after receiving the
first multicast packet
Response packet
Multicast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Obtain the delay betw een the
client and the server and work
as a client in multicast mode
Receive multicast packets and
synchronize its local clock
Netw ork
ClientServer
Multicast clock synchronization
packets periodically
Client/Server model request
request after receiving the
first multicast packet
Response packet
Multicast clock synchronization
packets periodically
Work as a server
automatically and
send response
packets
Obtain the delay betw een the
client and the server and work
Receive multicast packets and
synchronize its local clock