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Bank-Verlag: Linux Migration and SAP System Operation by Pironet NDH PresseBox (Pressemitteilung)(abonnement), Germany - 25 minutes ago Whereas the server that was hitherto in use employed the Unix operating system, the new hardware runs under the Linux Distribution from Red Hat. ...
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llc2_loop(1M) System Administration Commands llc2_loop(1M)NAME
llc2_loop - loopback diagnostics to test the driver, adapter and network.
SYNOPSIS
/usr/lib/llc2/llc2_loop2 [-v] ppa
/usr/lib/llc2/llc2_loop3 ppa sap frames
/usr/lib/llc2/llc2_loop3 ppa type frames
/usr/lib/llc2/llc2_loop4 [-v] ppa
DESCRIPTION
Loop 2
The loop2 test sends a NULL XID frame to the broadcast (all 1's) destination MAC address. The source SAP (Service Access Point) value used
is 0x04 (SNA's SAP). Therefore, if SNA is running on the system, the loop2 test will fail. The destination SAP value is the NULL SAP(0x00). This test finds out who is listening and can receive frames sent out from a node. The verbose (-v) option displays the MAC address
of responding nodes. All possible responders may not be displayed, since the loop2 test only waits for responses for 2 seconds, but during
this time 50-200 nodes may be displayed. The most likely error is:
Unexpected DLPI primitive x, expected y.
where x = 5 and y = 6. From /usr/include/sys/dlpi.h, the expected return value from one of the DLPI primitives is 6 (DL_OK_ACK), but
instead a 5 (DL_ERROR_ACK) was received. This can occur for two reasons:
o The loop2 command was issued to a non-existent PPA (Physical Point of Attachment).
o The SAP(0x04) is already in use (for example, the SNA subsystem is up).
Loop 3
The loop3 test sends 1,495 byte Unnumbered Information (UI) frames to the NULL (all 0's) destination MAC address. This should be used
along with data capture either on the local node or another node on the same LAN to verify the transmission of data. The ppa argument spec-
ifies the adapter on which to run the test. The ppa is the relative physical position of the adapter and may be ascertained by viewing
the adapter configuration (see llc2_config(1)). For Token Ring or Ethernet, specify an even sap value from 2 through 254, or, for Ethernet
only, any type value from 1519(0x05ef) through 65535(0xffff). It is advised to pick a value that is easily recognized when the data cap-
ture output is viewed.
frames is the decimal number of 1,495 bytes packets to transmit. The test will only display a message if a failure occurs.
Loop 4
The loop4 test sends a TEST frame (no information field) to the broadcast (all 1's) destination MAC address. The source SAP value used is
0x04 (SNA's SAP). Therefore, if SNA is running on the system, the loop4 test will fail. The destination SAP value is the NULL SAP(0x00).
This test finds out who is listening and can receive frames sent out from a node. The verbose (-v) option displays the MAC address of
responding nodes. All possible responders may not be displayed since the loop4 test only waits for responses for 2 seconds, but during
this time 50-200 nodes may be displayed. The loop4 test displays information similar to the following example if other nodes are listening
and respond (verbose mode):
-Attaching
-Binding
-Sending TEST
-Responders
1-0000c0c12449
2-08000e142990
3-08000e142a51
4-0000c0450044
5-0000c0199e46
-Unbinding
-Detaching
5 nodes responding
The errors displayed are the same as for loop2.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWllc |
+-----------------------------+-----------------------------+
SEE ALSO llc2_config(1), llc2(4), attributes(5), llc2(7D)NOTES
For information about how to start the service, see llc2(7D)SunOS 5.10 18 May 1999 llc2_loop(1M)
