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Network Mobility basic support protocol (NEMO BS) was stated by IETF to handle the mobility on a set of mobile or fixed nodes whilst it is moving. But this NEMO suffers from a number of limitations like the handoff latency and optimized path especially when a large number of mobile network nodes (MNN) inside the NEMO. To reduce the performance degradation inside and outside NEMO (i.e. egress, and ingress) interfaces, a new mechanism proposed to prioritize the user traffic inside NEMO according to user traffic class. This prioritizing to guarantee that the user with higher amount of traffic not suffers from Link drops by Corresponding Nodes (CN) when substantially insufficient resources (i.e. binding cache) allocated for binding a new request. This mechanism will increase the average throughput and reduce packet loss for user with higher amount of traffic like (VoIP).Network simulator Ns-2 has been used to validate the framework and to understand the behaviors of this mechanism.