IBM 3708 Description page 250

Network conversion unit
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NMVT 0025 Alert Format
The 3708 uses an NMVT (0025) record to send unsolicited data-link traffic counters
to SNA hosts. The NMVT (0025) vector sends error and traffic counters in the 3708
downstream ports to the NetView or NPDA data base.
The NMVT 25 vector contains the Transmit Data Threshold, Transmit Error
Threshold, Receive Data Threshold, and Receive Error Threshold counters. It is
transmitted unsolicited to the host when any of these counters are exceeded or when
the session ends abnormally. Each counter is reset when a new session begins. The
value 00000 disables each of these functions.
How NetView Uses Traffic Statistics:
NetView or NPDA uses the error and traffic
statistics to compute a current error-to-traffic ratio. NetView or NPDA then
compares the ratio to a NetView or NPDA threshold, which can be defined in one
of the following ways:
• Specified by an initialization parameter
• Changed dynamically by a NetView command or by a NPDA command
• Set to accept a NetView default or a NPDA default.
If the threshold is exceeded, NetView or NPDA creates a performance threshold
exceeded (PERF) event record and records the original data as a statistic.
The Most Recent Statistical Data screen at the host displays the error and traffic
counters.
If NetView or NPDA recognizes the PERF event records as alerts, NetView or
NPDA does the following as soon as the PERF event occurs:
• Records data about the alert
• Sends the data to the NetView or NPDA alerts-dynamic display terminals that
recognize PERF events as alerts.
NetView or NPDA can warn the network operator of possible resource failures when
the frequency of temporary errors is greater than an installation-defined threshold
value.
The basic format of the NMVT (0025) record is shown below, and details are listed
in Table 8-2. A description of the major fields in the record follows the table.
TH RH RU
NMVTHEADER
Length to End of RU
Product Set ID Subvector
Product ID Subvector
Hardware Product ID Subfield
Emulated Hardware Product ID Subfield
Relative time Subvector
Hierarchy Names Subvector
Counter ID Subvector.
Chapter 8. Network Management and Problem Determination
8-13

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