Applications
61
Simple Network Time Protocol (SNTP)
The Simple Network Time Protocol (SNTP) feature on the Perle
Routers support the client side of the protocol as described in RFC
2030. The router will be able to obtain its time from a NTP or SNTP
server and then can be synchronized amongst other network devices.
Additionally, the router can also be configured to support various time
variations features such as local time zone and adjustments for daylight
savings time.
When the Perle router has SNTP enabled it will periodically send NTP
packets to the NTP/SNTP server which will respond with the network
time. The router will synchronize its internal clock with the response
from the NTP/SNTP server. The method in which the router sends or
receives the NTP packets from the NTP/SNTP server is configurable
in three modes: unicast, multicast and anycast.
In unicast mode, the router will have to be configured with the IP
Address of the NTP server and will periodically send a request packet
to the NTP server. The NTP server will then respond directly to this
request with the current time. The Perle router supports a primary and
a secondary IP Address for NTP servers.
In multicast mode, the router does not initiate the request packets but
waits to receive the periodic broadcasts from the NTP server with the
current time. Once the router receives an NTP packet from the server,
it will then synchronize its internal clock with the current time.
In anycast mode, the router will send out a request packet as a
broadcast on the LAN to get a response from any NTP server. When
the first response is received from an NTP server, the internal clock of
the router is synchronized. The router will learn the IP Address of the
NTP server that responded and then operate in unicast mode.
The Perle router supports time variation feature of local time zones
and daylight savings time regardless if the internal clock is
synchronized with an NTP server. The local time zone feature allows
the router to offset the internal clock by a configurable time from the
UTC time. The configurable time zone off set can be specified in hours
(0 to 23) and minutes (0 to 59) and can also be specified by a specific
name up to 4 characters.
Adjustments to the internal clock for daylight saving time (Summer-
time) can be enabled and specified for one time within the year or
Summary of Contents for PERLE P850
Page 6: ......
Page 21: ...Installation 15 Figure 1 4 Front View of the P850 router Tx Rx Power ...
Page 83: ...Octet Locations on Ethernet Frames 77 Octet Locations on a Bridged XNS Frame ...
Page 101: ...Servicing Information 95 ...
Page 106: ...100 Router A PC used for TFTP transfers Link 1 Link 2 Router B Router C ...