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Compaq AAR04BCTE User Manual

Page 29

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MIBs Provided with TCP/IP Services

2.2 Overview of MIB II

When both the TCPIP$OS_MIBS and TCPIP$HR_MIB subagents are
running, a

get

request on the

sysORTable

is as follows. Except where

noted, the OIDs conform to RFC 1907.

1.3.6.1.2.1.1.9.1.2.1 = 1.3.6.1.4.1.36.15.3.3.1.1
1.3.6.1.2.1.1.9.1.2.2 = 1.3.6.1.4.1.36.15.3.3.1.2
1.3.6.1.2.1.1.9.1.3.1 = Base o/s agent (OS_MIBS) capabilities
1.3.6.1.2.1.1.9.1.3.2 = Base o/s agent (HR_MIB) capabilities
1.3.6.1.2.1.1.9.1.4.1 = 31 = 0 d 0:0:0
1.3.6.1.2.1.1.9.1.4.2 = 36 = 0 d 0:0:0

This example is from the MIB browser (TCPIP$SNMP_REQUEST.EXE).

Under certain conditions, a subagent makes a duplicate entry in

sysORTable

when it restarts. For example:

1.3.6.1.2.1.1.9.1.2.1 = 1.3.6.1.4.1.36.15.3.3.1.1
1.3.6.1.2.1.1.9.1.2.2 = 1.3.6.1.4.1.36.15.3.3.1.2
1.3.6.1.2.1.1.9.1.2.1 = Base o/s agent (OS_MIBS) capabilities
1.3.6.1.2.1.1.9.1.2.2 = Base o/s agent (OS_MIBS) capabilities
1.3.6.1.2.1.1.9.1.4.1 = 3256 = 0 d 0:0:32
1.3.6.1.2.1.1.9.1.4.2 = 3256 = 0 d 0:0:32

In this example, the TCPIP$OS_MIBS subagent made two entries with
different ID numbers (OIDs with the prefix 1.3.6.1.2.1.1.9.1.2) that may
show different

sysORUpTime

(1.3.6.1.2.1.1.9.1.4). The

snmp_request

program

translates the value received (in hundredths of a second) to the following,
dropping any fractions of seconds:

d n hh:mm:ss

In this format, n represents the number of days, hh represents the number of
hours, mm represents the number of minutes, and ss represents the number
of seconds.

The HR_MIB subagent has not yet successfully started and registered its
capabilities. If it starts, its entries in this example would use the next
available index number.

On systems running versions of the operating system prior to OpenVMS
7.1-2, counters for the MIB II

ifTable

do not wrap back to 9 after reaching

the maximum value (

2

32

0 1), as defined in RFC 1155. Instead, they behave

like the gauge type and remain at the maximum value until cleared by an
external event, such as a system reboot. The following counters are affected:

ifInDiscards
ifInErrors
ifInNUcastPkts
ifInOctets
ifInUcastPkts
ifInUnknownProtos
ifOutErrors
ifOutNUcastPkts
ifOutOctets
ifOutUcastPkts

Note that for SNMP Version 2, these counters are data type Counter32. The
following

ifTable

members are always -1 for OpenVMS:

ifOutDiscards

(Counter32)

ifOutQLen

(Gauge32)

MIBs Provided with TCP/IP Services 2–7