The ARP packet rate(89pps) exceeded the rate limit (50pps) on interface...

[Kjartan]

I came across this problem couple of weeks ago, my loggs were flooded with ARP packet rate messages and also had a high CPU load. Turned out to be due to Tc flooding and after going for RSTP in instead of PVST the problem went away. I now have the occasional message. This was in a mixed Cisco, HP enviroment.

Kjartan

[DavidYerger]

I saw ARP packet rate exceeding the default rate on all the link agg'ed interfaces as well as TCs and duplicate IP addresses logged yesterday where the core switch side of a 20G linkagg had one of the members taken out of the link aggregation group to an IDF by a consultant.   

Simply adding 

port link-aggregation group 5

back into the interface configuration got everything OK again.