3Com 5500-SI Configuration Manual page 497

Multicast IP address
ip-address
configured on the interface where the NTP multicast packets will be received.
Configuring NTP ID Authentication
Enable NTP authentication, set MD5 authentication key, and specify the reliable key. A
client will synchronize itself by a server only if the server can provide a reliable key.
Perform the following configurations in System View.
Table 569 Configure NTP Authentication
Operation
Enable NTP authentication
Disable NTP authentication
Setting NTP Authentication Key
This configuration task is to set NTP authentication key.
Perform the following configurations in System View.
Table 570 Configure NTP Authentication Key
Operation
Configure NTP authentication
key
Remove NTP authentication key undo ntp-service authentication-keyid number
Key number ranges from 1 to 4294967295; the key
number
ASCII characters.
Setting Specified Key as Reliable
This configuration task is to set the specified key as reliable.
Perform the following configurations in System View.
Table 571 Set the Specified Key as Reliable
Operation
Set the specified key as reliable
Cancel the specified reliable key.
Key number key-number ranges from 1 to 4294967295.
Designating an Interface to Transmit NTP Message
If the local equipment is configured to transmit all the NTP messages, these packets
will have the same source IP address, which is taken from the IP address of the
designated interface.
Perform the following configurations in System View.
Table 572 Designate an Interface to Transmit NTP Message
Operation
Designate an interface to transmit
NTP message
defaults to 224.0.1.1. This command can only be
Command
ntp-service authentication enable
undo ntp-service authentication enable
Command
ntp-service authentication-keyid number
authentication-mode md5 value
Command
ntp-service reliable authentication-keyid
key-number
undo ntp-service reliable
authentication-keyid key-number
Command
ntp-service source-interface {
interface-name | interface-type
interface-number }
NTP Configuration 497
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value