Lag spike on network with Ubiquiti Discovery enabled?

[bchur83]

I have been chasing a problem from a few customers using VoIP phones that are not under my control, they get them from their employers. They are stating consistent spikes in ping and jitter issues. I have been chasing it for about a month now and I think I may have found something of use. I posted this originally on the UBNT forum HERE and I think it may be an issue with the Discovery Protocol on my Netonix Switches. The flood of traffic I am seeing appears to be Discovery Broadcasts (UBNT and Netonix). At about the same time I noticed it started, I had installed a new WS12 switch with the latest at the time 1.4.1 firmware. I had read about some Discovery issues in previous firmware but not in this one. Everything seemed to go fine until a couple weeks later a customer complained of jitter issues with their VoIP phone. I had also upgraded a few of the other Netonix switches that are in my network as well to 1.4.1 around the same time.

So today in testing, I decided to turn off the Ubiquiti Discovery on the Netonix switches and boom, no more spikes. When using Wireshark, I still see the radio discovery broadcasts but it is a very small traffic spike, <200Kb/s compared to around 2-3Mb/s spikes before. I thought to myself, this cant be the issue, so I turned on Discovery on one Netonix switch, and boom.. its back again. Turn it off and it goes away.

So, I am just asking around to see if anyone else has experienced this issue before. Could it be a bug yet in the firmware. I have disabled discovery on the Netonix switches for now and dont really need to use it but it comes in handy sometimes.

If you want to read the whole thing, you can check out the link on the UBNT forums.

[sirhc]

Always upgrade to the latest code before reporting a possible bug as we only chase bugs reported in latest code.

But also maybe read the release notes?

FIXED
- Fixed SFP Stats for WS-10-250-AC
- Fixed Disabling Discovery Tab in the UI so it actually disables the service
- Fixed HIGH CPU utilization wen Discovery Tab was enabled
- Fixed port watt usage on the WS-8-150-DC
- Fix null switch name in emails
- Fix problem with ubnt discovery interfering with STP (we think this is fixed waiting on feed back)
- Fix for IGMP Snooping with VLANs (we think this is fixed waiting on feed back)

ENHANCEMENTS
- Added option to disable IGMP querier per VLAN if IGMP snooping is enabled
- Increased the acceptable voltage ranges to prevent false alerts
- Tweaked Pause Frame Storm Protection

KNOWN ISSUES
- Some language templates need help - please contact us to help
- Clearing Stats on SFP ports singly is broken on some models - Known broken on WS-10-250-AC and WS-12-250-XX

Released 6/15/2016