Dynamic ARP entries Switching to Static

Every once and a while all the dynamic arp entries in my arp table for my core switch ( hp a5120 IRF stack ) get switched to static.

I am unable to figure out why this is happening.  I have not set any of the static arp entries.

My ARP aging is set to the default 20min'ss.  

My mac aging time is set to 10sec's.

Anyone have this issue or a cure?

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Joey YungSenior Network EngineerCommented:
Do you have enable the DHCP snooping with Dynamic ARP protection?
adminjamAuthor Commented:
DHCP Snoopoing is enabled.
Dynamic ARP protection is not.
Joey YungSenior Network EngineerCommented:
Um... so do you have the static binding like this:

vlan 100
device ip
device mac aabbccddeeff
port 1

ip source binding 100 aabbccddeeff 1
adminjamAuthor Commented:
Fixed with firmware upgrade

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adminjamAuthor Commented:
I did a firmware upgrade on the a5120 and the issue went away.
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