NI PXI 8176 broadcasting Version 2 Spanning Tree Updates

I am not the owner of this device, but I am in IT. We had an NI PXI8176 suddenly start broadcasting version 2 spanning tree protocols over the network... this is a mystery to us. Has anyone ever seen this, or have theories why it would do this?
thanks
Nan

I'm not very familiar with spanning tree protocols, but I thought that they were for network bridges and switches.
Have you had any viruses on that PXI-8176? Think of the PXI-8176 as a laptop in a different form factor when troubleshooting this kind of stuff. This sounds like an OS/virus/network issue.
Good luck.
Jack

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    skrao

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    One thing that happens when you have a loop in a switched network is that you get a broadcast storm. Since Ethernet has not "Time To Live" field, if you have a loop in your network then the broadcasts get transmitted round the loop forever, saturating all the links.
    Spanning Tree is a protocol designed to identify the loops and to cut them. There is not really any such thing as a "Spanning Tree loop", because Spanning Tree actually prevents loops. Do NOT disable it unless you are 110% sure that you have no physical loops in your network.
    So, if you have a network that is looping, how do you identify where Spanning Tree is not working? It is made difficult by the fact that your network has stopped functioning correctly. The switches may be too busy to give you access to the management functions.
    In most cases, the loop is due to a very recent change. Usually, creating a loop makes the network go down immediately, or exactly 90 second later. What has changed recently?
    If you can access the management functions, then find out which VLAN has the traffic storm, and trace it out.
    If your access switches have redundant uplinks, then disconnect them, leaving one uplink per access switch, and see if the storm stops. You should have uplinkfast running anyway, so this should not disrupt your traffic any more than it is already.
    Know your network before the loop happens! In this case, prevention is really better than cure. If you can, put a broadcast limit on all your trunks. Enable BPDU guard on all your access ports.
    Sniff the storming broadcasts, and look at the source MAC addresses. Use these brodcasts to identify the access switch involved.
    Anyone else got any techniques they use to identify the loops?
    Kevin Dorrell
    Luxembourg

  • Spanning Tree on RV220W

    Hello,
    I'm using the RV220W in a small office. Now I would like to add two switches with spanning tree activated. I can see from the RV220W datasheet that it supports spanning tree. I also found a manual to configure it.
    http://sbkb.cisco.com/CiscoSB/ukp.aspx?login=1&pid=2&app=search&vw=1&articleid=2296
    Article ID 2296
    The problem is I can't find this settings on my router which has got the newest firmware 1.0.5.8
    Is it activated by default, or was this function deleted in later firmware versions?
    Regards
    Timo Ostendarp

    The 7ks as roots with the priority and peer-switch commands as you show above would be best practice. With that, you wouldn't have to make any non-default spanning-tree settings on the 5k switches.

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