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Operating Systems AIX AIX server problem - network connection is unstable ! Post 303044823 by RecoveryOne on Wednesday 4th of March 2020 03:35:07 PM
Old 03-04-2020
This is a pretty large box, a E870 as a matter of fact. Is the network coming from a VIO? If so: Is the VIO network setup correctly? Does the VIO have the correct resource assignments to provide services to however many lpars you have running?

I ask the above because I encountered an issue where the VIO was set up by an MSP and what was happening is every so often the active network path would switch from say c1-p1-t1 to c10-p1-t1. That would cause a momentary ping delay. Much like what you are seeing. My network team was the first to report it to me, as they would see the MAC for the etherchannel device change which port it was reporting on the switch. The item they sent me was %SW_MATM-4-MACFLAP_NOTIF. It was caused by the etherchannel on the VIO having two primary adapters and no backup adapter. Taking one of the primary adapters and moving it to the backup adapter fixed the issue. Your results may vary.

If they are dedicated adapters and not coming from the VIO, again check your AIX configuration. Something to note, your tcp_recvspace and rfc1323 are not consistent with your adapters. That might be by design, but gives me pause that network wasn't set up correctly.

Now, everything else that everyone has posted here comes into play as well, and I'm not a network admin so I cannot weigh in on the other topics presented here.

Push comes to shove, start a ticket with the IBM AIX team.
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ee(7)							 Miscellaneous Information Manual						     ee(7)

NAME
ee - Intel (82558/28559) PCI 10/100 Ethernet SYNOPSIS
config_driver ee DESCRIPTION
The ee interface supports the Intel 82558 and 82559-based Compaq adapters (including the DE60x line of adapters). These PCI bus adapters support standard 10/100 Ethernet operation, and provide equivalent service compared to the DE500-BA adapters (IEEE 802.3u Autonegotiation, full/half duplex, 10/100 Mbps). In addition to the standard features, the Compaq adapters support a hardware feature called parallel detection. This feature detects speed (10/100) and mode (full/half duplex) automatically when connecting to a repeater/switch that does NOT perform IEEE 802.3u Autonegotiation. By default, the driver uses Autonegotiation mode. This mode either connects to the remote partner with IEEE 802.3u Autonegotiation or resolves the speed and mode using parallel detection. The adapters are designed to automatically connect to all network configurations without manual intervention. However, if manual intervention is required, lan_config operations are supported (see lan_config(8) for more information). If you want to preserve your lan_config command information across system restarts, edit the /etc/inet.local file and include the appropriate commands. This information also remains the same through system version updates. This driver does NOT require new console firmware to operate in a runtime only manner. Tru64 UNIX does not use console variables to define media, mode, or speed. Booting over a network requires SRM firmware Version 5.5 or later (on most platforms). ERRORS
The following diagnostic error messages contain relevant information provided by the ee interface, and are printed on the console. Each message begins with the adapter identification, including the unit number of the adapter. The ee driver found a system that has not defined cachelinesize in the PCI configuration header. This is an informational message only, and the driver correctly defines the cache- linesize parameter. Not enough free memory exists to run the driver. The EEPROM on the board did not pass the checksum test. The board indicated in this message is unusable. The device did not pass self test. The diagnostic test that failed follows immediately after this message. The board indicated in this message is unusable. RELATED INFORMATION
Commands: lan_config(8) Files: inet.local(4) delim off ee(7)
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