Apple Devices Casuing intermittent network outages

[Thomas_Randolph]

We have recently started rolling Apple devices at one of our locations. Approximately 1200 iPads. They are connecting to via an Aerohive wireless solution. That solution has 1 point of entry to my network at a B5 switch that is also doing layer 3 for that site to our WAN. When the iPads starting ramping up, it has seemed to cause frequent intermittent network outages. Devices on the rest of lan in different vlans stop communicating and then will come back within 5-10 seconds. This happens anywhere from 1-50 minutes during every hour of the day including overnight when no users are onsite. After extensive troubleshooting, we still have not identified the cause of the problem but believe it is possibly something with the B5G124-48P2. From one of my switches at the local site, when the problem happens, I cannot reach my default gateway, which is the IP address of that vlan interface configured on the B5. Since affects all vlans, we suspect the B5. The routing is all static and RIP is disabled. Also when this is happening, the system CPU is not excessive, it is usually around 26-45% but I have seen it spike very shortly up to 60-80%. I have debug logging enable and the have no logs indicating that system resources are taxed. The only recurring log entry I get is "DHCPRELAY[265701448]: relay_main.c(315) 568089 This is from manager 1 %% Request could not be relayed to Server". I have also checked my DHCP server, however it is supporting all 14 of my sites with no issues anywhere else. I checked the mac tables and we usually sit at just under 4000 entries, but according to the specs for the B5 it can support up to 24,000. I appreciate any help or suggestions.

[Thomas_Randolph]

The rmon stats show clean 0 errors or drops. We did check spantree too. We actually disabled it as a test, but did not change the result.

[Joseph_Burnswor]

Could you tell us what REV of code is on the B5?

[Joseph_Burnswor]

How does the AeroHive handle all of the mDNS from the iPads? Sounds like the multicast is over running the switch. Are the AP's and the wireless networks on different VLANs from the workstations?

[Jeremy_Gibbs]

That's the version of code we are running.. It's been rock solid so far.

[Thomas_Randolph]

Hw:BCM56514 REV 1

Bp:02.02.51

Fw:06.81.05.0003

BuFw:06.81.01.0027

PoE:2_1