We compare the service received by TCP and UDP flows when they share either a link or a Multiprotocol Label Switching(MPLS) traffic trunk. Since MPLS traffic trunks allow non-shortest path links also to be used, the total network throughput goes up with proper traffic engineering. If UDP and TCP flows are mixed in a trunk, TCP flows receive reduced service as the UDP flows increase their rates. Also, we found that in order to benefit from traffic engineering, MPLS trunks should be implemented end-to-end(first router to last router). If some part of the network is MPLS trunk-unaware, the benefits are reduced or eliminated.
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