Automatic VLAN Monitoring and Alerting

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  • Updated 3 years ago
Recently I had a situation where the guest network at a remote location wasn't working. The problem was due to a config change done about a month ago (trunk port was removed from the default BR100 config). The employees wifi kept working because they use the default vlan. However, the guest network sat unused for some time and it wasn't reported broken until there was a training session at that location.

Now for the question:
Is there any way to have the APs check the availability of the VLANs they are supposed to be trunking and fire off a report with failed connections?

Automate the VLAN Probe tool?
Some report in Hivemanager I'm not aware of?
Supplemental CLI?
Feature request?
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Will Rhodes

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Posted 3 years ago

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Nick Lowe, Official Rep

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Hi Will,

An AP may not know which VLANs it may end us using, often that is returned dynamically by a RADIUS server. In that scenario, an AP has no prior knowledge of all the VLAN ids that may be used. (It's just a stateless tag after all.)

It would certainly, however, be conceptually possible to configure a list/range of VLANs ids that you wish to monitor along with the IP of an expected default gateway (or use DHCP). The ARP table (passive) or gratuitous ARPs (active, where necessary), for each of the expected L2 broadcast domains, could then be used to ensure this remains as expected without resorting to ICMP.

(It would also be conceptually possible to snoop in on all VLAN ids, to warn when unexpected broadcast domains become exposed to an AP.)

At the moment, this is not possible in HiveOS so it would be a feature request.

Cheers,

Nick
(Edited)
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Nick Lowe, Official Rep

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I meant to write ARP requests, not gratuitous ARPs. Jeeze :(
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Will Rhodes

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Thanks Nick