3Com 5500-SI Configuration Manual page 495

Table 563 Configure NTP Time Server
Operation
Configure NTP time server ntp-service unicast-server ip-address [ version
Cancel NTP server mode
NTP version number
number
key ID ranges from 0 to 4294967295;
keyid
specifies the IP address of an interface, from which the source IP
interface-number
address of the NTP packets sent from the local Switch to the time server will be taken;
indicates the time server will be the first choice.
priority
Configuring NTP Peer Mode
Set a remote server whose ip address is
equipment. In this case, the local equipment operates in symmetric active mode.
specifies a host address other than a broadcast, multicast or reference
ip-address
clock IP address. In this mode, both the local Switch and the remote server can
synchronize their clocks with the clock at the opposite end.
Perform the following configurations in System View.
Table 564 Configure NTP Peer Mode
Operation Command
Configure NTP peer
ntp-service unicast-peer ip-address [ version number
mode
] [ authentication-key keyid ] [ source-interface {
interface-name | interface-type interface-number } ]
[ priority ]
Cancel NTP peer mode undo ntp-service unicast-peer ip-address
NTP version number
number
key ID ranges from 0 to 4294967295;
keyid
specifies the IP address of an interface, from which the source IP
interface-number
address of the NTP packets sent from the local Switch to the peer will be taken;
indicates the peer will be the first choice for the time server.
priority
Configuring NTP Broadcast Server Mode
Designate an interface on the local Switch to transmit NTP broadcast packets. In this
case, the local equipment operates in broadcast mode and serves as a broadcast
server to broadcast messages to its clients regularly.
Perform the following configurations in the VLAN interface view.
Table 565 Configure NTP Broadcast Server Mode
Operation
Configure NTP broadcast server
mode
Cancel NTP broadcast server mode undo ntp-service broadcast-server
NTP version number
number
key ID ranges from 0 to 4294967295. This command can only be configured
keyid
on the interface where the NTP broadcast packets will be transmitted.
Command
number ] [ authentication-keyid keyid ] [
source-interface { interface-name |
interface-type interface-number } ] [ priority ]
undo ntp-service unicast-server ip-address
ranges from 1 to 3 and defaults to 3; the authentication
interface-name
ip-address
ranges from 1 to 3 and defaults to 3; the authentication
interface-name
Command
ntp-service broadcast-server [
authentication-keyid keyid version number ]
ranges from 1 to 3 and defaults to 3; the authentication
NTP Configuration 495
or
interface-type
as the peer of the local
or
interface-type