Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 1764)

SNMP Introduction
Software Reference for x310 Series Switches
67.6 AlliedWare Plus TM Operating System - Version 5.4.4C C613-50046-01 REV A
Instances
Objects are just templates for data types. An actual value that can be manipulated by an
NMS is an instance of an object. An instance is named by appending an instance identifier
to the end of the object’s object identifier. The instance identifier depends on the object’s
data type:
■ If the object is not a column in a table, the instance identifier is 0 (zero). For example,
the instance of the sysDescr object is:
sysDescr.0
or 1.3.6.1.2.1.1.1.0
■ If the object is a column in a table, the method used to assign an instance identifier
varies. Typically, the value of the index column or columns is used.
The object ifTable in MIB-II contains information about interfaces and is indexed by the
interface number, ifIndex. The instance of the ifDescr object for the first interface is:
ifDescr.1
or 1.3.6.1.2.1.2.2.1.2.1
If the index column is an IP address, the entire IP address is used as the instance identifier.
The object ipRouteTable in MIB-II contains information about IP routes and is indexed by
the destination address, ipRouteDest. The instance of the ipRouteNextHop object for the
route 131.203.9.0 is:
ipRouteNextHop.131.203.9.0
or 1.3.6.1.2.1.4.21.1.7.131.203.9.0
If the table has more than one index, the values of all the index columns are combined to
form the instance identifier. The object tcpConnTable in MIB-II contains information about
existing TCP connections and is indexed by the local IP address (tcpConnLocalAddress),
the local port number (tcpConnLocalPort), the remote IP address (tcpConnRemAddress)
and the remote port number (tcpConnRemPort) of the TCP connection. The instance of
the tcpConnState object for the connection between 131.203.8.36,23 and
131.203.9.197,1066 is:
tcpConnState.131.203.8.36.23.131.203.9.197.1066
or 1.3.6.1.2.1.6.13.1.1.131.203.8.36.23.131.203.9.197.1066