11/28/95, 4FAX# 1298
 
  Understanding LED 581 in AIX 3.2 and 4.1
 
 
 
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  ABOUT THIS DOCUMENT
 
       This document describes what happens during the time that
       LED 581 is shown during boot up and what may cause an indef-
|      inite hang on LED 581.  This document applies to AIX 3.2 and
|      4.1 on a RISC System/6000.
 
  WHAT HAPPENS DURING LED 581
 
       LED 581 is shown during the time that the Configuration
|      Manager ("/usr/sbin/cfgmgr -s") configures TCP/IP and runs
       "/etc/rc.net" to do specific adapter/interface/hostname con-
       figuration.
 
       Much of what happens during this time depends on factors
       such as network traffic, valid network addresses, network
       access, network hardware/microcode, and the number and type
       of adapter/interfaces being configured.  TCP/IP over some
       interfaces (token ring, for example) will wait for replies.
       If there are no replies, it will eventually timeout on the
       attempt and mark the interface as down.  Nevertheless, this
       will take some time (possibly between three to ten minutes)
       or may hang indefinitely.
 
  PROBLEM DETERMINATION FOR LED 581 HANG
 
       To verify that the methods and procedures run by /etc/rc.net
       are causing the LED 581 hang, boot in Service mode and move
       the /etc/rc.net file to /etc/rc.net.save.  Then, reboot in
       Normal mode to see if the system continues past the LED 581
       and allows you to log in.  (Note:  The above steps assume
       that neither DNS or NIS is configured.)
 
       If you determine that the procedures in /etc/rc.net are
       causing the hang (that is, the system continued past LED 581
       when you performed the steps above), the problem may be one
       of the following:
 
       o   Ethernet or token-ring hardware problems (this is the
           cause of the majority of 581 problems).  Run diagnostics
           and check the error log.
 
 
 
                             Understanding LED 581 in AIX 3.2 and 4.1  1
 
 
                                                    11/28/95, 4FAX# 1298
 
       o   Networks not accessible.  Check gateways, nameservers,
           and NIS masters for an "up" condition.
 
       o   Bad IP addresses or masks.  Use iptrace or ipreport for
           problem determination.
 
       o   Corrupt ODM.  Methods/rules need to be established via
           reconfiguration.
 
       o   Premature name or IP address resolution.  Named,
           ypbind/ypserv, or /etc/hosts may need correction.
 
       o   Extra spaces at the ends of lines in configuration
           files.  On the /etc/filesystems file, use the "vi"
           editor with the "set list" subcommand.
 
|      o   Bad LPPs.  Reinstall the LPP.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                             Understanding LED 581 in AIX 3.2 and 4.1  2
 
 
                                                    11/28/95, 4FAX# 1298
 
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  END OF DOCUMENT (led581.tcp, 4FAX# 1298)
 
 
 
                             Understanding LED 581 in AIX 3.2 and 4.1  3