I consistantly get utilzation spikes way above 100%.  Here is the relevant part of the rotuer config:   

 

 

ip flow-cache timeout inactive 30
ip flow-cache timeout active 1

interface Serial0/1/0
 description XXXXXXXXXXX

 ip address X.X.X.X X.X.X.X 
 ip nbar protocol-discovery
 ip flow ingress
 ip flow egress
 encapsulation ppp

 

snmp-server ifindex persist

For the interface setup in ManageEngine Netflow i have it set to 1536000 bits/sec and the circuit is a full T1. 

 

Does anybody have any suggestions on how to fix this?