78 Chapter4
Troubleshooting 10/100Base-TX/9000
Diagnostic Flowcharts
Flowchart 7 Procedures
A. Execute: linkloop to remote host. Enter the PPA
(NMID) of your 10/100Base-TX card and link level
address (station address) of the remote host in
hexadecimal form (preceded by “0x”). Execute lanscan
(1M) on the local system to find the PPA (NMID) and
obtain the link level address (station address) of the
remote host. For more information on linkloop, refer to
the linkloop(1M) online man page.
B. linkloop successful? If the test was successful, go to
flowchart 1 to verify that the problem is solved.
Network connectivity is o.k. through the Link Layer
(OSI Layer 2). If not successful, note which error was
returned and continue with this flowchart.
C. Loopback failed: Address has bad format. The
link level address is not correct. Go to F.
D. Loopback failed: Not an individual address. The
link level address is not correct. The first hexadecimal
digit has itshigh order bit set (ifthe value is equal to or
greater than 8, it isset). This means it is a multicast or
broadcast address, which is not allowed. The address
must be unique to one remote host. Go to F.
F. Loopback failed. The remote host did not respond.
Go to G.
Correct the link address parameter. Change the
link level address to an allowed value and start again
with flowchart 7.
G. Choose a different remote host; re-execute
linkloop. Restart flowchart 7 using a different remote
host.
H. linkloop successful? If the test was successful, go to
step I. Network connectivity is o.k. through the Link
Layer (OSI Layer 2). If not successful, the problem
may be with the remote system. Go to flowchart 6.
I. Check remote host's connectivity to
10/100Base-TX. Contact the node manager of the
remote host. Check that the host is configured
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