SNMP amplification attacks are nothing new, as Sean Power comments on the article for PC World.
The effectiveness of the attack stems from the fact that any site can be targeted and requires very little effort to produce excessive traffic.
It relies on third party unsecured networks to do most of the heavy lifting for the attack.
Blocking these attacks is best done via your edge devices as far removed from the targets as possible.
See if your ISP would be willing to block incoming SNMP traffic (and run your own SNMP traffic, if needed, through a secure tunnel or VPN).
If the attack is large enough that it is overwhelming your edge devices then you need to look at cloud based solutions for cleaning the traffic before it lands on your doorstep.
Click here to read the full article.