Model: MTS200 (1U)
Doc. Ref. no. : - m08/om/201
Issue no.: 03
Page 149 of 195
User’s Manual
Now, once user has accessed MTS200 console through ssh, user can run console based configuration
utility program “start” as explained in section 9.2.
After, user finished MTS200 configuration over ssh, user should close the ssh session by giving
command “exit” on MTS200 console. This will close ssh session with MTS200. This is necessary to
prevent unauthorized access to device because if ssh session is not closed, user who is not authorized
can take access and change the device configurations without the knowledge of operator.
13.3 SNMP
SNMP protocol is capable of managing multiple network devices remotely via devices configuration and
its monitoring. SNMP communication is operated on application layer in network devices. SNMP
architecture mostly resembles server-client architecture as SNMP devices are configured as either SNMP
Manager or SNMP agent device. SNMP Manager can configure as well as monitor SNMP agent as per
configured parameter in SNMP MIB files. MIB (Management Information Base) files are the configuration
files which contain details about variables (identified as OID-object identifiers) which can be configured
and monitored by SNMP Manager in SNMP agent device. SNMP protocol also provides the flexibility to
send the alarms as SNMP traps from SNMP agent to the configured SNMP Manager.
mas
TER
T-Sync
device act as SNMP agent and support SNMP version 1, 2 and 3 for its configuration and
monitoring of run time variables. Also, it can send SNMP traps in mentioned versions to configured SNMP
managers. It is capable to handle single or multiple variables walk, get or set requests. It also provides
the flexibility to configure max. 2 SNMP managers each in either of version with read / read-write options.
It has its own customized MIB database for variables allowed to be configured in device.
The elements (objects / variables) are organized in data structures called Management Information Base
(MIB).The agent is also responsible for controlling the database of control variables defined in the
product‟s MIB.
13.3.1 SNMP Addressing:
SNMP addressing is structured as a very large tree database. A root node address is an integer value
that ranges from 0 to some very large number. Conceptually, there are no limits to the numbers of sub
nodes either. SNMP addressing is written in “dotted decimal” notation. For example, the address of
mas
TER
T-Sync
model MTS200
product name Enterprise MIB variable is “1.3.6.1.4.1.38306.1.1.0”, this is
also known as OID (Object Identifier). The address fragment 1.3.6.1.4.1 is fixed by the IANA (Internet
Assigned Number Authority) and is the
address of the SNMP Private Enterprise MIB‟s. The 38306 is the
address assigned by IANA to
masibus
for our Enterprise MIB‟s.
masibus
assigns the addresses after
that at our discretion and design.
13.3.2 Protocol Detail:
SNMP operates in the Application Layer of the Internet Protocol Suite. The manager may send requests
from any available source port to port 161 to the agent. The agent will response back to the manager
address on port 162. The manager receives notifications (Traps and Inform-Requests) on port 162.
SNMPv1 specifies five core protocol data units (PDUs). Two other PDUs, Get-Bulk-Request, and Inform-
Request were added in SNMPv2. The seven SNMP protocol data units (PDUs) are as follows:
i) GET-Request:
This PDU is used to get the values of a list of variables from a particular host.
ii) Get-Next-Request:
This PDU is used to Get the next value for multi-valued data-items (for
example the entries in a routing table). The manager specifies one or more variables for
value, and the agent returns the current value for each of the requested variables.
iii) Set-Request:
This PDU is used to set the values of a list of variables for a particular host.
iv) Get-Bulk-Request:
This PDU is optimized version of Get-Next-Request, used to request
multiple iteration of Get-Next-Request. It allows the caller to specify
– non-repeaters, range of
variables which are single valued, max-repetition, no of values to be returned by the call.
