Hitachi GR2000 Series Configuration Commands page 355

Related Standards
The NTP specifications of GR2000 are based on RFC1305.
Precautions
Depending on the type of the connected NTP server, the usable authentication
key length may be shorter than 32 bits. In such a case, adjust the key contents to
match the usable key length of the connected NTP server.
If a host name is specified to the <address> parameter where applicable (e.g.,
peer, server, and broadcast) and such host name is wrong, no error checking
will be performed. Once the definition operation is complete, make sure that the
host name specified with this object is displayed on the console. Incidentally, if a
host name is initially specified with this ntp object and thereafter another host
name is added with the hosts object, the change does not promptly take effect.
To force the change to take effect, restart the NTP server with the command
string GR2000 Operations Commands, Vol. 1, restart ntp command.
If the difference of internal clocks between the referenced server and this GR2000
router is 1000 seconds (approx. 16 minutes) or more, the time data
synchronization does not take place because the server is regarded as invalid. If
the server's time (i.e., the time of the host containing the time server to which this
router references as the time source) turns out to be correct, then adjust the
router's time to the server's time using GR2000 Operations Commands, Vol. 1, set
calendar or rdate command.
In a configuration where this router references multiple time servers and any
time difference among the time servers is 16 seconds or more, this router can
synchronize with its time servers but devices subordinately connected to this
router cannot synchronize with this router acting as their time server. In such a
case, make sure that the said configuration is as expected and see if the time
settings of the defined time servers are correct.
When this router and multiple time servers employ peer-to-peer connections,
there may be cases when a very long time is required before this router completes
time synchronization with all these time servers. If this could happen, it is
recommended to decrease the number of peers.
When this router refers to multiple time servers and one time server fails to
provide time data within the allowable range (less than 1000 seconds), the server
for the time synchronization target automatically switches to any other server
available. If such occurrence is left without an appropriate action, however, the
synchronization target will be eventually disconnected. To avoid this, you must
disable the router's referencing the failing time server. Incidentally, while the said
synchronization is off and the failing time server setting is adjusted to fall within
the allowable range, the synchronization with the time server is automatically
recovered.
This function can be used only with IPv6. Therefore, if the host name with the
IPv6 only defined is specified with hosts (host name information) in the peer
server, the peer server is nullified.
If this command is inputted in the cases where changes are made on the IP
routing protocol information, the IP multicast protocol information, and the
MPLS information, and the apply command is not being executed, the apply
subcommand is executed before the command is executed, and the changed IP
routing protocol information, IP multicast routing protocol information, and
MPLS information are reflected to the operation.
If using this device as NTP server, set the number of synchronized clients at a
maximum of 10.
GR2K-GA-0014
Ver. 07-02
Operation Management Information
4-25