Possible network loop-Help


we would like your help regarding network loops. We are using a lot of Cambium products and we are now possibly having an a network loop caused by a client connected to a 3000l radio. The radio is running on the 4.5.6 firmware.

Is there any way we can guard against such occurences? Is there any setting that will allow us to identify such a loop early on (possibly even find which client antenna broadcasts the looped packets)? Is there a way to nulify or ameliorate the effects of the network loop? We are also using cnmaestro so please let us know if we can do anything from that end.

Thank you very much!

Maybe STP or use SM in router mode?

Thank you both for your contributions.

Here’s how the network is setup:

  • The p2mp antenna is bridged

  • Client radios are bridged

  • We are using PPPoE and the authentication is done on the client’s router

If there is anything more specific you can suggest based on the info I’ve provided, it’d be great. Thank you so much again for your timely responses!

Hi brubble,

we will try it out and let you know. I have one question though regarding the “deny all” from lan interface rule: would that have no implications for the client’s internet access? Does it mean that it will block all local packets from going beyond the cpe radio and thus preventing them from affecting other clients?

Also, what are other causes of a network loop?. Could it be malware or faulty radio somehow mirroring packets (e.g., ePMP 1000 now starting to cause a LOOP)?

Thank you so much for your help!

1 Like

It is easier to just not run bridged and put the pppoe in the CPE radio unless you provide a managed wifi router, in which case that router must be the firewall point to block everything except your authentication method and use a VSA to modify the firewall once authentication is accepted.


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