3Com Switch 7750 Configuration Guide Guide

700 CHAPTER 66: NTP CONFIGURATION
NTP client mode
When the Switch 7750 Family operates in the NTP client mode,
■ The remote server identified by the remote-ip argument operates as the NTP
time server. The Switch 7750 Family 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.
NTP peer mode
When the Switch 7750 Family operates in NTP peer mode,
■ The remote server identified by the remote-ip argument operates as the peer of
the Switch 7750, and the Switch 7750 operates as the active peer. The clock of
the Switch 7750 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.
NTP broadcast server mode
When the Switch 7750 operates in NTP broadcast server mode, it broadcasts a
clock synchronization packet periodically. The devices which are configured to be
Configure to operate in the
NTP peer mode
ntp-service unicast-peer {
remote-ip | peer-name } [
authentication-keyid key-id
| priority | source-interface
interface -type
interface-number | version
number ]*
Optional
By default, no Ethernet switch
operates in the NTP peer
mode
Enter VLAN interface view
interface interface -type
interface-number
-
Configure to operate in the
NTP broadcast client mode
ntp-service
broadcast-client
Optional
By default, no Ethernet switch
operates in the NTP broadcast
client mode
Configure to operate in the
NTP broadcast server mode
ntp-service
broadcast-server [
authentication-keyid key-id
| version number ]*
Optional
By default, no Ethernet switch
operates in the NTP broadcast
server mode
Configure to operate in the
NTP multicast client mode
ntp-service multicast-client
[ ip-address ]
Optional
By default, no Ethernet switch
operates in the NTP multicast
client mode
Configure to operate in the
NTP multicast server mode
ntp-service
multicast-server [ ip-address
] [ authentication-keyid
keyid | ttl ttl-number |
version number ]*
Optional
By default, no Ethernet switch
operates in the NTP multicast
server mode
Table 543 Configure NTP implementation modes
Operation Command Description