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UDEV will rename interfaces from whatever the kernel called them to eX before converting them to ethX during init. In current VyOS, the second renaming operation can run into a lock on the adapter preventing altering its name. As a result, the adapter will remain in the eX configuration, preventing proper execution of subsequent scripts and configuration stanzas. The initial renaming step has to remain as it is needed to work around other issues, which leaves the somewhat hacky approach of delaying the second renaming step slightly in an effort to let the device lock holders settle, releasing it for rename to ethX. This is accomplished by a kernel commandline paramter (3s), which can be tweaked to reduce impact or wait longer as needed on different devices - udev.exec_delay=3