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Why UDP ?
The generic feature for raw data transmission minimizes its side effects on protocols shipped over it:
avoided any kind of CC over CC, like TCPoverTCP
Efficiently meet the requirements for redirect message multicast
multicast for CE->FE redirected data will be a very common case for use, e.g.:
for routing protocol messages
for multicast protocol messages
Efficiently meet the requirements for heartbeat broadcast
just consider hundreds of FEs connected to a CE
Well-known and widely deployed
This is so important a point that it may affect deployment of ForCES greatly.

PPT Version