Black Box LRA 2900, Справочное руководство

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18 • SNMP Model LRA2900A RAS Administrators’ Reference Guide
223 Using SNMP with the Access Server
Figure 75. Parameter format
Finding the section of the MIB tree in which the SNMP parameter resides
Refer to figure 76 on page 225 and look at the Model LRA 2900 MIB tree. There two sections in the tree:
• The Internet standards section, identified by the shaded box surrounding it. In this section are MIBs (Man-
agement Information Base) that deal with Internet standards such as SNMP, IP, ICMP, Frame-Relay, and
Ethernet. It contains parameters that could potentially be on any machine that implements these features.
• The private Black Box MIB—In this section are MIB variables that are specific to Black Box products. This
section is further divided into:
– Those variables valid for a group of products
– Those variables valid for a Model LRA2900A
Active Calls is a product specific parameter.
Now, the OID can start to be built up. Choose the nodes that will take you to the private Black Box MIB
(these nodes are shaded red in figure 76 on page 225). All private Black Box MIB variables will begin with this
series (1.3.6.1.4.1.1768).
Finding the branch where the SNMP parameter resides
On the SNMP web page are links to the Black Box MIB definitions. Most of the MIBs are common to all
Black Box access server products, therefore the parameter is likely to be found in the Enterprise MIB. Click on
Enterprise MIB and open the file. Search for the SNMP name diActive that maps to Active Calls. The follow-
ing entry is listed:
diActive OBJECT-TYPE
SYNTAX INTEGER
ACCESS read-write
STATUS mandatory
DESCRIPTION "The total number of active calls."
::= { calldialin 25 }
The entry includes the name, the type, the access available, and the description of the parameter. The last line
gives another part of the OID. There the diActive parameter is identified as parameter 25 under the calldialin
branch. Looking at the MIB tree, the calldialin node is labeled as branch 5 (shaded green in figure 76 on
page 225).
Note
For the purpose of this example, figure 76 on page 225 shows param-
eter identifier 25 (diActive). Normally, a MIB tree shows only
branches and nodes, it will not show the myriad of parameters that
come under each node. Therefore, while you can use the MIB dia-
grams in Appendix B, “MIB trees” to map out the OID through the
Enterprise node level, you will need to refer to section “Using SNMP