z/OS Communications Server: ACF/TAP Trace Analysis Handbook
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LAN line trace reports

z/OS Communications Server: ACF/TAP Trace Analysis Handbook
GC27-3645-00

The selection parameter is NTPRT.

This topic contains LAN line trace reports. See the following figures:

This topic contains a legend for interpreting LAN line trace report information.

ACF/TAP formats data for the user-specified logical line address if either the DA and DSAP data, or the SA and SSAP data, matches the values specified on the LLN parameter. You can specify 1 logical line address or ALL.

Table 1 describes the column headers and the trace data contained in this report type. To locate this information about the sample reports, reference the numbers (n) listed in this table to the corresponding numbers (n) shown in the sample reports.

Table 1. LAN line trace report
Reference number (n) Report column headers and the trace data
1 The page heading contains the report name, report parameter, and the date the report was printed or displayed.
2
RECORD/ELEMENT
Cross-reference to the data with the line trace detail and the SYSPRINT reports.
3
LINE ADDRESS/TYPE
The address of the physical line and the type of element traced:
  • For ESS data, the following addresses apply:
    • ENET ARP
    • ENET IP
    • 802.3
    • 802.3 ARP
    • 802.3 IP
  • For NTRI data, the following addresses apply:
    • NTRI PHY
    • NTRI LOG
  • For IP data, the following addresses apply:
    • T-R ARP
    • T-R IP
4
R/T
Indicates whether the element is a receive (R) or transmit (T) element.
5
DA Destination address
This destination address and the destination system access point (DSAP) make up the logical destination address.
6
SA Source Address
This source address and the source system access point (SSAP) make up the logical source address.
7
DSAP
This is the destination system access point. For ESS data, this field contains X'AA' for 802.3 snap encapsulated; otherwise it is blank. For IP data, this field also contains X'AA'.
8
SSAP
This is the source system access point. For ESS data, this field contains X'AA' for 802.3 snap encapsulated; otherwise, it is blank. For IP data, this field also contains X'AA'
9
NS
Transmitter send-sequence number valid only for I-frames. For ESS or IP data, this field is blank.
10
NR
Transmitter receive-sequence number valid only for I-frames and S-frames. For ESS or IP data, this field is blank.
11
RI
Indicates whether routing information is present. For ESS data, this field is blank.
Y=
Represents Yes, and the routing information is present.
N=
Represents No, and the routing information is not present.
12
C/R
This field indicates whether the data is a command (C) or response (R). For ESS data or IP data, this field is blank.
13
P/F
An S in this field indicates the poll or final bit are set; otherwise, the field is blank. For ESS or IP data, this field is blank.
14
CMD
Interpretation of a U-frame or S-frame command or response. For ESS or IP data, this field is blank.
15
TIME
The chronological order for frames that have been processed. This is an NCP internal time and not the system time. The format is mmm:ss.t, where mmm is minutes, ss is seconds, and t is tenths of seconds.
Because the TIME stamp is contained in a 2–byte field, the highest possible value is 109:13.5. A time stamp one-tenth of a second later wraps to 0:00.0.

The TIME value appears only in LAN line trace data for logical lines.

16
HEX
A hexadecimal dump of the trace element.

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