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If NPDA recognizes the block identification from the 3708, normal problem
determination is available, including recommended action screens and detail
description screens.
NetView is required for the user to perform full problem determination. For a
description of the alerts that the 3708 generates, refer to IBM 3708 Network
Conversion Unit Problem Determination.
Sending Alerts to the SNA Hosts
The 3708 always sends alerts unsolicited to the SNA host. There are three categories
of events that result in the generation of problem determination information (alert
messages) that are transmitted to the host (NetView) by the 3708:
• Internal alert
• Downstream alert (modem/interface errors). For downstream link errors,
NMVT 0025 (traffic and error counters) accompanies the alert.
• Security violations.
A fourth event causes the NMVT 0025 problem determination vector to be
transmitted unaccompanied to NetView is counter overflow (for downstream ports).
The user can connect the 3708 to SNA hosts and ASCII hosts.
If
the 3708 is
connected to multiple SNA hosts, it sends an alert to the SNA host that owns the
resource for that alert. If the 3708 is connected to an ASCII host, problem
determination for the 3708 consists of logging a generated alert at the control
terminal and transmitting the alert to all active SNA hosts. The 3708 does not send
an alert to an ASCII host connection.
The 3708 SNA alert function provides problem determination information, collected
by the 3708 or entered by a control operator, to NetView. Existing versions of
NPDA support the 3708 through default processing; only the text associated with the
general cause and specific component codes are displayed on the Alerts Dynamic
display.
Alert Message Formats
The 3708 uses Network Management Vector Transport (NMVT) records to send
alerts and traffic data to SNA hosts.
The 3708 sends all alerts in the same specific NMVT (0000) format. Only the last
three vectors (the detail qualifiers) vary in number, depending on the alert. For
communication errors on downstream ports, another NMVT (0025) follows the alert.
This NMVT contains the downstream traffic and error counters for the port on
which the error was detected. In cases where the downstream traffic or error
counters reach a threshold (as configured in the 3708 port definition), the NMVT
(0025) is sent unsolicited to NetView for statistical processing.
The following sections list the 0000 and 0025 NMVT formats used by the 3708.
Chapter 8. Network Management and Problem Determination
8-7
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