H3C S7500 Series Operation Manual page 805

Operation Manual – NTP
H3C S7500 Series Ethernet Switches
I. NTP client mode
When an S7500 series switch operates in the NTP client mode,
The remote server identified by the remote-ip argument operates as the NTP time
server. The S7500 series switch operates as the client, whose clock is
synchronized to the NTP server. (In this case, the clock of the NTP server is not
synchronized to the local client.)
When the remote-ip argument is an IP address of a host, it cannot be a broadcast
or a multicast address, neither can it be the IP address of a reference clock.
II. NTP peer mode
When an S7500 series switch operates in NTP peer mode,
The remote server identified by the remote-ip argument operates as the peer of
the S7500 series switch, and the S7500 series switch operates as the active peer.
The clock of the S7500 series switch can be synchronized to the remote server or
be used to synchronize the clock of the remote server.
When the remote-ip argument is an IP address of a host, it cannot be a broadcast
or a multicast address, neither can it be the IP address of a reference clock.
III. NTP broadcast server mode
When an S7500 series switch operates in NTP broadcast server mode, it broadcasts a
clock synchronization packet periodically. The devices which are configured to be in the
NTP broadcast client mode will respond this packet and start the clock synchronization
procedure.
IV. NTP multicast server mode
When an S7500 series switch operates in NTP multicast server mode, it multicasts a
clock synchronization packet periodically. The devices which are configured to be in the
NTP multicast client mode will respond this packet and start the clock synchronization
procedure. In this mode, the switch can accommodate up to 1,024 multicast clients.
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Chapter 1 NTP Configuration