When a node experiences saturation with respect to incoming packets, what general strategies may be used?

What general strategies should be done while one has saturation with respect to incoming packets?
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"Two general strategies can be adopted. The first such strategy is to discard any incoming packet for which there is no available buffer space. The alternative is for the node that is experiencing these problems to exercise some sort of flow control over its neighbors so that the traffic flow remains manageable."
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"The received packets at the input could be discarded. "
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