Couple things regarding ARP
Suppose a situation PE-Cloud-CE, where something happens to CE and it needs to be replaced. I've noticed that more often than not, I do not need to clear arp on PE.
Is this because of Gratuitous ARP CE is sending once it brings its interface up?
If so, is it treated the same way as ARP Resulotion, in that it can update the PE's arp cache, regardless if there is already an entry?
Lastly, is there a GARP timer or is it event triggered, ie link up?