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I see this confirmed in the fact that even not all pmds implement this function (e.g. virtio) and that some pmds call the link_up function in their start function. However I am a bit confused by this example code: https://doc.dpdk.org/api/examples_2ip_pipeline_2link_8c-example.html#a20 in which there is a call to rte_eth_dev_set_link_up after the start. In what cases is it needed to call rte_eth_dev_set_link_up right after rte_eth_dev_set_link_up? Thanks John