The NIC failover does not work in LBT mode

Dear community,


We met a strange behavior in our network environment while testing our new Cisco 4500 switches x 10g. If you have a TCP Session (example JJ | netcat) data transfer between two virtual machines on different host esx failover does not work on the VM receiver if a physical connection fails.

The test configuration is as follows:

|    | - 4 - switch 1 vmnic - vmnic 4-|    |

VM1 | ESX1 |                  | VSS |                    | ESX2 |-VM2

|    | - 5 - switch 2 vmnic - vmnic 5-|    |

More details:

  • The switches are configured as a cluster VSS. New version of the software
  • ESX1/2 are running the latest version 5.5
  • The two vmnic is active on a DV-switch in LBT mode
  • Exchanges are configured with "Port based on the physical NIC load."
  • VM1 and VM2 are invited linux, NICS are vmxnet3

Steps to reproduce:

  1. Beginning listening mode on VM2 (netcat-l Pei 12345 |) JJ = / dev/null)
  2. Start the transfer on VM1 (dd if = / dev/zero bs = 1 M | netcat VM2 12345)
  3. Check which link is used (in my example vmnic5 on ESX2)
  4. Unplug the ESX2 vmnic5

What you observe:

  • DD-traffic dies immediately
  • If you kill the dd on machines (it does not end by itself) and start all over again, it works immediately
  • If you ping VM1 VM2 or another system, it works
  • If you plugged vmnic5 again once the virtual machine is switched to new vmnic5-> if you didn't kill dd will continue

Now to test the reverse:

  1. Beginning listening mode on VM2 (netcat-l Pei 12345 |) JJ = / dev/null)
  2. Start the transfer on VM1 (dd if = / dev/zero bs = 1 M | netcat VM2 12345)
  3. Check which link is used (in my example vmnic4 on ESX1)
  4. Disconnect vmnic1 ESX1

What you observe:

  • Failover works like a charm
  • Failback works like a charm

Conclusion:

  • Only the virtual machine at the front desk has a problem
  • Only an already established TCP session behaves badly, work of new sessions very well (as does ping, no losses)
  • If you use LACP place LBT on uplink the problem disappeared
  • Same problem if you connect two links to Switch1
  • Same problem if you use a physical box with linux and LACP as system
  • I did the same test with two c3750x (no cluster VSS) and has not encountered the problem

Any ideas? It's really a good one.

Thank you!

Sascha



Update:

To make it clear, it doesn't have the transmission of UDP.

Post edited by: sewert1

Advertisement

I did some further testing and also involved cisco. There is no problem with the switches and network in general.

Turns out he works with Windows clients, but it does not work with Linux. But it works with Linux with adapters e1000 and e1000e but not with vmxnet3.

So I did some tests and learned that the vmxnet3 kernel module must be at least version 1.3. Version 1.1 (SLES 11 default) or 1.2 (default SLES12) does not work.

(./vmware-install.pl--clobber-noyau-modules = vmxnet3)

Tags: VMware

Similar Questions

  • Get the error, Drivermax does not work in Compatibility Mode

    I installed an updated driver called drivermax, but whenever I try to download the updates, it says does not work in compatibility mode, change back the settings to devices.exe. I don't know what they mean or how to do that, someone has an idea?

    Please make sure that you have installed the latest version of DriverMax, this problem should be solved. Anyway, please contact us at http://www.innovative-sol.com/contact/ and we will do our best to help you.

  • Restore not working - the option to restore on my machine does not work. I've highlighted the dates. Does not work in safe mode

    Original title: restoration works not

    The weight restoration on my machine does not work. I've highlighted the dates but I get... impossible to restore messages. I tried switching off my virus checker (Norton) but with the same result.

    Some tools Anti Virus 'protect' your system so that they will not allow a restore of the system work properly.
    For example, if you use Norton/Symantec products, you will see a message like this:
    Restoration incomplete. Your computer cannot be restored...
    It is also a popular Symantec problem (well, I'll be polite and call an "undocumented feature"...), they wrote an article about it:
    According to what you use for malware protection, you may need to disable the product temporarily, do the system restore and then turn the products light up again when the system restore is complete.
    Sometimes you need start your system in Mode safe and so that your protection programs are not running, and then do the system restore.

    Tips from Microsoft in some of their articles that if the system restore does not restore your computer, start in Safe Mode, and then run the system restore.

    It works for some configurations.

  • As I installed the latest OS 10.0.1 on my iPhone, the Pandora app does not work.

    As I installed the latest OS 10.0.1 on my iPhone, the Pandora app does not work.

    Have you installed the latest update of Pandora (version 7.6), posted on September 13, 2016?

  • How to copy and paste into the search engine does not work?

    How to copy and paste into the search engine does not work?

    It should be.

    Restart your Mac and try again.

    Other than that, make sure that OS X is updated.

    Open the App Store, and then select the updates menu.

  • When in my wordpress dashboard, the Visual Editor does not work?

    Regularly when I'm in my wordpress dashboard, the Visual Editor does not work. Sometimes, not all the time. I tried the following:
    Disabled individual plug-ins
    Theme modified
    cache cleared
    uninstalled, then reinstalled Firefox
    'disable the Visual Editor' unchecked

    Thanks a lot for any help

    When this happens, you are totally unable to type/edit in the edit box, or are there limited functionality? The toolbar appear?

  • my browser cannot open google and facebook and other https sites that it does not open even the app store does not work, I tried to change my DNS google DNS and disable IPv6 but still no use, help PLZ!

    my browser cannot open google and facebook and other https sites that it does not open even the app store does not work, I tried to change my DNS google DNS and disable IPv6 but still no use, help PLZ!

    You may have installed one or more variants of the malware "VSearch' ad-injection. Please back up all data, and then take the steps below to disable it.

    Do not use any type of product, "anti-virus" or "anti-malware" on a Mac. It is never necessary for her, and relying on it for protection makes you more vulnerable to attacks, not less.

    Malware is constantly evolving to work around defenses against it. This procedure works now, I know. It will not work in the future. Anyone finding this comment a couple of days or more after it was published should look for a more recent discussion, or start a new one.

    Step 1

    VSearch malware tries to hide by varying names of the files it installs. It regenerates itself also if you try to remove it when it is run. To remove it, you must first start in safe mode temporarily disable the malware.

    Note: If FileVault is enabled in OS X 10.9 or an earlier version, or if a firmware password is defined, or if the boot volume is a software RAID, you can not do this. Ask for other instructions.

    Step 2

    When running in safe mode, load the web page and then triple - click on the line below to select. Copy the text to the Clipboard by pressing Control-C key combination:

    /Library/LaunchDaemons

    In the Finder, select

    Go ▹ go to the folder...

    from the menu bar and paste it into the box that opens by pressing command + V. You won't see what you pasted a newline being included. Press return.

    A folder named "LaunchDaemons" can open. If this is the case, press the combination of keys command-2 to select the display of the list, if it is not already selected.

    There should be a column in the update Finder window. Click this title two times to sort the content by date with the most recent at the top. Please don't skip this step. Files that belong to an instance of VSearch will have the same date of change for a few minutes, then they will be grouped together when you sort the folder this way, which makes them easy to identify.

    Step 3

    In the LaunchDaemons folder, there may be one or more files with the name of this form:

    com Apple.something.plist

    When something is a random string, without the letters, different in each case.

    Note that the name consists of four words separated by dots. Typical examples are:

    com Apple.builins.plist

    com Apple.cereng.plist

    com Apple.nysgar.plist

    There may be one or more items with a name of the form:

    com.something.plist

    Yet once something is a random string, without meaning - not necessarily the same as that which appears in one of the other file names.

    These names consist of three words separated by dots. Typical examples are:

    com.semifasciaUpd.plist

    com.ubuiling.plist

    Sometimes there are items (usually not more than one) with the name of this form:

    com.something .net - preferences.plist

    This name consists of four words (the third hyphen) separated by periods. Typical example:

    com.jangly .net - preferences.plist

    Drag all items in the basket. You may be prompted for administrator login password.

    Restart the computer and empty the trash.

    Examples of legitimate files located in the same folder:

    com.apple.FinalCutServer.fcsvr_ldsd.plist

    com Apple.Installer.osmessagetracing.plist

    com Apple.Qmaster.qmasterd.plist

    com Apple.aelwriter.plist

    com Apple.SERVERD.plist

    com Tether.plist

    The first three are clearly not VSearch files because the names do not match the above models. The last three are not easy to distinguish by the name alone, but the modification date will be earlier than the date at which VSearch has been installed, perhaps several years. None of these files will be present in most installations of Mac OS X.

    Do not delete the folder 'LaunchDaemons' or anything else inside, unless you know you have another type of unwanted software and more VSearch. The file is a normal part of Mac OS X. The "demon" refers to a program that starts automatically. This is not inherently bad, but the mechanism is sometimes exploited by hackers for malicious software.

    If you are not sure whether a file is part of the malware, order the contents of the folder by date modified I wrote in step 2, no name. Malicious files will be grouped together. There could be more than one such group, if you attacked more than once. A file dated far in the past is not part of the malware. A folder in date dated Middle an obviously malicious cluster is almost certainly too malicious.

    If the files come back after you remove the, they are replaced by others with similar names, then either you didn't start in safe mode or you do not have all the. Return to step 1 and try again.

    Step 4

    Reset the home page in each of your browsers, if it has been modified. In Safari, first load the desired home page, then select

    ▹ Safari preferences... ▹ General

    and click on

    Set on the current Page

    If you use Firefox or Chrome web browser, remove the extensions or add-ons that you don't know that you need. When in doubt, remove all of them.

    The malware is now permanently inactivated, as long as you reinstall it never. A few small files will be left behind, but they have no effect, and trying to find all them is more trouble that it's worth.

    Step 5

    The malware lets the web proxy discovery in the network settings. If you know that the setting was already enabled for a reason, skip this step. Otherwise, you should undo the change.

    Open the network pane in system preferences. If there is a padlock icon in the lower left corner of the window, click it and authenticate to unlock the settings. Click the Advanced button, and then select Proxies in the sheet that drops down. Uncheck that Auto Discovery Proxy if it is checked. Click OK, and then apply.

    Step 6

    This step is optional. Open the users and groups in the system preferences and click on the lock icon to unlock the settings. In the list of users, there may be some with random names that have been added by the malware. You can remove these users. If you are not sure whether a user is legitimate, do not delete it.

  • can't connect to my home internet income james ashley forgot it the link password does not work and the password I was given does not fit into the password box

    can't connect to my home internet income james ashley forgot it the link password does not work and the password I was given does not fit into the password box

    Are you sure that you do not have to register on this site through the usual way and what you should be used elsewhere on the site?

    Have you tried to contact them to help this topic or to check if they have a FAQ on this subject?

    I found this in another thread that you created [*]:

    I'm not sure do I bought a home income internet james ashley program and I copied the login info I was given and the password does not fit into the window of password and I forgot the link password does not work I sent emails, but do not receive an answer im don't know what to do is anyway you can help me to recover my info or help me change the password?

    I assume that you have downloaded and installed this program and need to use this password in this program or only you can use these data to download the program from the site james ashley?

  • The CD/DVD does not work with El Capitan 10.11.5 on Macbook Pro

    Hello everyone, I spent the time to research on the here and the other site on why the CD/DVD does not work with El Capitan 10.11.5 on MacBook Pro mid 2009. This discussion forum has said that he will not work with the El Capitan software. Any idea or suggestion? Back to Marverick or Yosemite? I tried to use SMC reset, restart, recovery and still the same issue.

    I thank in advance.

    ~ Mike

    I have my doubts that the (10.11.5) software is the problem.  Are you sure that the DVD player is simply not defective?  Have you tried to clean the lens?  What is the State of the disc?

    Your best option may be a date at a bar in engineering of the Apple store for a FREE evaluation.

    Ciao.

  • The new tab (+) does not work, or the file/new tab feature

    The new tab (+) does not work. The function of the file/new tab does no more work. Both had worked correctly until noon today. I haven't added any software, plug-ins or extensions today, I do not have the Ask toolbar. I tried several of the suggestions made on this site, nothing helps.

    This problem may be caused by an extension that does not work in the current version of Firefox.

    Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem (switch to the DEFAULT theme: Firefox/tools > Modules > appearance).

    • Do not click on the reset button on the start safe mode window or make changes.
  • Firefox automatically updated itself, would not add new bookmarks, then deleted all mine, will not always add new, now the back button does not work. I'm Livid.

    I think I'm on Firefox 13.0. He put itself as part of the update of my computer up to date (at least I guess that's what happened, because it has changed). I noticed yesterday that he would not favorite Web sites, but I thought it was just the website or bookmarks have been full-time or something. Today, I tried to remove a few bookmarks to make more, but they would not remove. I tried to register a new site, and it wouldn't work. I tried to close/exit firefox and re-opening of the program. While the program was closed, I installed the next set of updates on my computer. When I have opened firefox, all my favorites, and the tab menu (or what you call personal small bar on the actual tabs) were gone. I can't always favorite of new sites, so I can't even re-do all my favorites (and I got a lot, all of them arranged so it's a big loss and incredibly annoying). Then I realized that the back button does not work. And the cursor remains on the typing that I symbol, it does not change the arrow, when I click on a link.

    One possible cause is a problem with the places.sqlite file that stores the bookmarks and history.

    You can also try to repair the database of places with this extension:

  • The scroll feature does not work on my mouse.  I installed new batteries, but it still does not.

    The scroll feature does not work on my mouse.  I installed new batteries, but it still does not.

    Look in the system Prefereces - mouse and make sure the scrolling feature is set up how you want. If the action still does not work, please reset the SMC and the PRAM by iMac SMC and the PRAM reset

  • Firefox 6 is a disaster, not only the google toolbar does not work but also yahoo toolbar

    I've updated to firefox 6 and now my yahoo toolbar does not work. It was first the google toolbar is not compatible with firefox 5 now the yahoo toolbar does not work HELP?

    See this - http://help.yahoo.com/l/us/yahoo/toolbar/toolbar2ff/troubleshootff/;_ylt=Akw3jVWwVDlujfQI3kFVqduJsHdG

    Check and tell if you are able to solve the problem.

  • When I enter a Web site in the url of the Enter key does not work. I have to click on the arrow at the end of the line. Is this a configuration problem?

    The Enter key does not work in the line of the URL. If I go says:
    www.Bing.com
    and then press the Enter key, nothing happens.
    I have to click the arrow at the end of the field in order to activate the link.
    If I am anywhere else on any page the Enter key works as it should.

    Please click the button of resolved next to the answer that solved your problem of Firefox support, when you are connected.

  • Satellite A10 S203: the CPU fan does not work properly?

    I have toshiba satellite a10 s203 and the cpu fan does not work correctly. What can I do about it?

    Hi SACRIFICE them.

    Here are some possible solutions to this problem of fan.

    1. When you have installed a base installation of MS (not the Toshiba Recovery CD) you need to install the Toshiba Power Saver and others utilities from the CD tools & utilities. The energy saver is responsible for the control of the fan.

    2. If you have a recovery based OS, you can update the energy saver of http://eu.computers.toshiba-europe.com site Web Toshiba under Support & Downloads - Download Driver

    If please check this and an answer then follow the next step!

    CAMPino

Maybe you are looking for