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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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atmsetup(8)						      System Manager's Manual						       atmsetup(8)

NAME
atmsetup - Configures Asynchronous Transfer Mode (ATM) adapters and services SYNOPSIS
/usr/sbin/atmsetup [-old] OPTIONS
Invokes the atmsetup script. This option is for backward compatibility, and will be removed in a future release. DESCRIPTION
The atmsetup command by default invokes the SysMan ATM Configuration application. This application enables you to configure and run ATM on your system. Specifically, you can configure network adapters and logical interfaces on the adapters for the following environments: Clas- sical IP, LAN Emulation, and IP Switching. Compaq recommends you use the SysMan application. Note Support for IP Switching will be retired in a future release. Do not use it to develop new applications. During the adapter configuration, you specify the adapter name, the Endpoint System Identifiers (ESIs), pacing options, the type of network physical layer, and whether to enable flow control, Integrated Local Management Interface (ILMI), signaling, and virtual circuit (VC) accounting. In addition, you specify the User-Network Interface (UNI) version. During logical interface configuration, you specify information related to each ATM environment. For Classical IP, you choose whether the system is an ATMARP client or server and whether to configure permanent virtual circuits (PVCs). For LAN Emulation, you choose which emu- lated LAN to join and how to join the emulated LAN. For IP Switching, you specify the Subnetwork Attachment Point (SNAP) VCI number and VCI limits. In all three cases, you change only those default values that your configuration requires. See Asynchronous Transfer Mode for information on configuring ATM and the ATM configuration application online help for more information. Before invoking the atmsetup command, make sure that your system is connected to a switch, the network software is configured and running, ATM is configured into the kernel, and the ATM subsets are installed. After running atmsetup, you must configure the ATM interfaces with the correct IP address and netmask. Select Configure Interfaces from the SysMan menu. See sysman(8) for more information. atmsetup Script If you specify the -old option, the atmsetup script is invoked. This script prompts you for all information that you need to enter in order to configure ATM. The script creates and maintains a directory hierarchy /etc/atm, which contains all the ATM configuration information. The atmsetup script configures the driver and signaling on an ATM end system. In addition, you can configure your system to operate in a Classical IP or Local Area Network (LAN) emulation environment. See Asynchronous Transfer Mode for additional information on configuring ATM on your system. RESTRICTIONS
You must be superuser to use this command. The atmsetup script (-old option) has the following restrictions: You can configure only lis interfaces to support SVCs and elan inter- faces. It supports boot-time configuration only. FILES
Specifies the command pathname The path name containing ATM commands to execute when the system is booted The path name containing ATM com- mands to execute when the system is shut down ATM Configuration Help Volume (SysMan) SEE ALSO
Commands: atmarp(8), atmconfig(8), atmelan(8), atmsig(8), sysman(8), sysman_station(8) Network Administration Asynchronous Transfer Mode atmsetup(8)
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