Decision Data 3000 Series, Руководство пользователя

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10SNMP Management
SNMP (Simple Network Management Protocol) agent functionality, allows SNMP
management of the Model 3494 and its devices, in Token-Ring and Ethernet attachment.
The SNMP manager can control and monitor statistics counters, node port status, status of
the devices and communication lines. The Controller sends the manager alerts called
TRAPs, if there are any unusual events it should be informed of such as downed or
problematic lines.
The set of variables that controller supports is called MIBs (Management Information Base).
The MIB consists of several parts including the Standard MIBII, specified as part of the
SNMP, and the Private MIB that is specifically defined for particular applications.
Private MIBs enable the manager to recognize and graphically display the 3494 controller,
and its device attachment. The display consists of graphical representation of each
controller slot indicating its activity, and its port assignment.
When configuring for SNMP management, the IP address and Subnet address are essential
parameters and must be defined; the rest of the parameters are optional.
10.1
TCP/IP Network Description
Define each LAN according to its class and internet structure, taking into account its
expected development. The network IP address consists of 32 binary bits divided into four
groups of 8-bits each. The groups provide the following information:
Class type , Network
and Host address.
Class type
The first three address bits determine the Class type. The network is classified according to
its size and expected growth structure into: Class A, Class B or Class C. The IP address
allocates a number of bits for the local network address and a number of bits for the host
address. The partition of the host and local network address bits depend on the class type.
Class A
0
1 0 netid hostid
1 1 0
hostid
netid
netid
hostid
Class B
Class C
Class A internet consists of few networks with many hosts. Accordingly, its address
consists of three network-bits and fifteen host-bits, allowing up to 8 networks with 8192
hosts per network.
Class B internet is an intermediate network and is assigned an equal number of bits for
networks and hosts--8-bits each. This allows it develop up to 256 networks with 256 hosts
per network.
1