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1920s LAG Creating Network Loops and Broadcast Storm

 
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1920s LAG Creating Network Loops and Broadcast Storm

I have 4 HP 1920S (the "s" in the model number is important) switches that I'm trying to set up in a mesh configuration with LAG connections.  This is a rough diagram of what I'm trying to do:  https://imgur.com/a/IldkI

I've set up this same configuration multiple times with 1920 (without the "s") switches without problems.  But when I try to configure the same thing on these 1920s switches it creates a network loop / broadcast storm and brings the network down.  (I have these 4 switches isolated in a lab.)  I don't know what I'm doing wrong and will very much appreciate any help anyone can send my way.

These are the steps I followed to create the 6 LAGs.

*Create VLANs 100 and 200
*Add VLANS 100 and 200 to TRK1 through TRK6, set "Participation" to "Include", set "Tagging" to "Tagged"
*Add ports to TRK1 through TRK6, set "Static mode" to "Disabled".  For example SW1 and SW2 are both connected through their ports 47 and 48, so I add ports 47 and 48 to TRK1 on SW1 and SW2.  But SW2 ports 45+46 connect to SW3 ports 43+44 through TRK4, so I configure them accordingly by adding those specific ports on each switch to TRK4.  And so on...

I have 2 separate workstations, one with 10.0.0.10/24 plugged into SW1 and the other with 10.0.0.11/24 plugged into SW2.  When I connect ports 47+48 on SW1 to ports 47+48 on SW2 (which is TRK1) then both workstations can ping each other successfully.  When I connect the rest of TRK2 through TRK6 the loop gets created and the workstations cannot ping each other anymore.

Do the 1920s switches not support link aggregation?  The manual says they do, but there is no "Network -> Link Aggregation" menu option like there is on the 1920 or 1910 models. 

Thanks for any help you can give

7 REPLIES
peyrache
Respected Contributor

Re: LAG Creating Network Loops and Broadcast Storm

Right, 1920s do not support link aggregation protocol

Re: LAG Creating Network Loops and Broadcast Storm

Thanks for replying!

Can you point me to any documentation that explains that?  When I first started working on this problem I searched to verify that the 1920s model supports link aggregation, and from what I could find they do support link aggregation.  For example, the 4 links below all list link aggregation as an included feature.

  1. https://h20195.www2.hpe.com/v2/Getdocument.aspx?docname=a00001630enw
  2. https://h20195.www2.hpe.com/v2/Getdocument.aspx?docname=a00002986enw
  3. https://www.hpe.com/us/en/product-catalog/networking/networking/pip.hpe-officeconnect-1920s-switch-series.1009689650.html
  4. https://support.hpe.com/hpsc/doc/public/display?docId=emr_na-a00003485en_us

Am I misunderstanding what it meant by "link aggregation" in those 4 links?

parnassus
Honored Contributor

Re: LAG Creating Network Loops and Broadcast Storm


@peyrachewrote:
Right, 1920s do not support link aggregation protocol

Totally false. HPE OfficeConnect 1920S Switch series supports links aggregation.

Re: LAG Creating Network Loops and Broadcast Storm

Thanks parnassus

Do you know what the problem might be with my configuration?

Do you know of any guides I could use to create these link aggregation groups while not creating network loops at the same time?  I feel like I must be missing something fundamental.

peyrache
Respected Contributor

Re: LAG Creating Network Loops and Broadcast Storm

You can't firmware code in board do not know link aggragation protocol, so you can play with Spanning tree to avoid loop inside multiple link that's all for S models
JY
parnassus
Honored Contributor
Solution

Re: LAG Creating Network Loops and Broadcast Storm

Exactly. It's a matter of enabling and configuring Spanning Tree.

Please refer to HPE OfficeConnect 1920S 8G/24G/48G Switch Series Management and Configuration Guide available here.

Re: LAG Creating Network Loops and Broadcast Storm

Yes, you are correct, that's what the problem is.  Rookie mistake on my part.  I think in the past the switches I've used had STP enabled by default, or the config files I was re-using had STP included and I didn't pay attention.

Thank you for your help!