Akamai Servers: Normal or Weird?

Is something funny happening with them lately or is it normal to see 45Mbps of UDP traffic between akamai servers (45Mps peak, average for the past 24 hours is around 15Mbps. Prior to that it wasn't enough to show up in our graphs). More information: Our akamai farm is the one recieving all of the data - its coming into our various akamai hosts on port 1455. I've never looked at this traffic before so I don't know if this is normal or not. I understand that the servers have to talk to each other to distribute content but why UDP and why consume so much bandwidth? Chris