Strange IPSEC traffic

[Shawn L via NANOG <nanog () nanog org>]

Is anyone else seeing a lot of 'strange' IPSEC traffic?  We started seeing logs of IPSEC with invalid spi on Friday.  
We're seeing it on pretty much all of our PE routers, none of which are setup to do anything VPN related.  Most are 
just routing local customer traffic.
 
decaps: rec'd IPSEC packet has invalid spi for destaddr=X.X.X.X, prot=50, spi=0x9D2D0000(2636972032), 
srcaddr=211.112.195.167, input interface=TenGigabitEthernet0/0/11
 
decaps: rec'd IPSEC packet has invalid spi for destaddr=Y.Y.Y.Y, prot=50, spi=0x14690000(342425600), 
srcaddr=74.116.56.244, input interface=TenGigabitEthernet0/0/5
 
The destination address is always one of our customer's ip addresses.  The source seems to be all over the place, 
mostly Russia, Korea, China or south east asia.  It's not really impacting anything at the moment, just rather annoying.
 
Thanks
 
Shawn