3Com Switch 7754, Configuration Manual

Page: 756 / 940

756 C
HAPTER
70: NTP C
ONFIGURATION
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.
Broadcast mode
Figure 195 NTP implementation mode: broadcast mode
Multicast mode
Figure 196 NTP implementation mode: multicast mode
Table 601 describes how the above mentioned NTP modes are implemented on a
Switch 7750.
Table 601 NTP implementation modes on a Switch 7750
NTP implementation mode Configuration on Switch 7750
Client/Server mode Configure the Switch 7750 to operate in the NTP
server mode. In this case, the remote server
operates as the local time server, and the Switch
7750 operates as the client.
Peer mode Configure the Switch 7750 to operate in NTP peer
mode. In this case, the remote server operates as
the peer of the Switch 7750, and the Switch 7750
operates as the active peer.
Client
Broadcast clock synchronizati on
packets periodically
Network
Server
Initiates a client/server mode
request
after receiving the
first broadcast packet
Works in the server mode
automatically and sends
response packets
Client/server mode
reques
Response packet
Obtains the delay between the
client and server and works in
the broadcast client mode
Receives broadcast packets and
synchronizes the local clock
Broadcast clock synchronizati on
packets periodically
Client
Multicast clock synchronizati on
packets periodically
Network
Server
Initiates a client/server mode
request
after receiving the
first multicast packet
Works in the server mode
automatically and sends
response packets
Client/server mode
reques
Response packet
Obtains the delay between the
client and server and works in
the multicast client mode
Receives multicast packets and
synchronizes the local clock
Multicast clock synchronizati on
packets periodically