Multicast Mode - 3Com 4200G 12-Port Configuration Manual

294 C 35: NTP C
HAPTER ONFIGURATION
Broadcast mode
Figure 92 NTP implementation mode: broadcast mode
Server Server Server Server
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

Multicast mode

Figure 93 NTP implementation mode: multicast mode
Server Server Server Server
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
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
Client/Server mode
Peer mode
Broadcast mode
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
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
Configuration on S4200G switches
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.
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.
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.
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 work as client and the server and work as client and the server and work as client and the server and work 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 w ork client and the server and w ork client and the server and w ork client and the server and w ork
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