ARP-storm. 1910-8G

[Votion]

Good day. 

I really need your help cause I have no idea what it is and how i can fix it.

In my network i have about 10 HP Procurve 2510, 2610 and other and 2 HP 1910-8G (192.168.7.238, 192.168.7.239)

I have some strange problems with these Hp Procurve 1910-8G. Sometimes (5-10 times in the day) these HP 1910-8G send a lot (10000-15000 packets per second) of unicast ARP packets.  Source - It's my HP 1910, Destination - some computers in my network (which are shut down in this moment). 

As I know It's unicast arp poll - "Unicast Poll -- Actively poll the remote host by periodically sending a point-to-point ARP Request to it, and delete the entry if no ARP Reply is received from N successive polls. Again, the timeout should be on the order of a minute, and typically N is 2."

Typically.. but no in my situation. Could you explain me this strange behaviour and how can i fix it? 

Hope for your help. Thanks in advance. 

In the attachment - screenshot from the Wireshark in the moment of ARP storm and actually wireshark file *.pcapng

1. First HP 1910-8G

Device Name
HP 1910-8G Switch JG348A

Product Information
HP 1910-8G Switch Software Version Release 1513

Software Version 
5.20 Release 1513

Hardware Version 
REV.A

Bootroom version

158

2. Second HP 1910-8G

Device Name
HP 1910-8G Switch JG348A

Product Information
HP 1910-8G Switch Software Version Release 1513P81

Software Version 
5.20 Release 1513P81

Hardware Version 
REV.A

Bootroom version

169

[Richard Brodie_1 · Accepted solution]

The 1910s seem to want to refresh their ARP cache after a topology change. I haven't seen anything like the scale of ARP flooding that you have though: there's no possibility that you have a transitory loop at the same time?

I managed to reduce the problem by disabling the gratuitous ARP learning function, which reduced the size of the ARP table.

[Votion]

Richard Brodie_1

Thanks a lot for your attention. After reading your post i've used "loop-protect" in my others HP Procurve switches and found out that i really have some loops in my network. So i think there are no problem in HP 1910-8G.. Hope after removing loops everything will be ok. Thank you for your help.