47528c67ef
- Warn, don't exit, when SIOCSLAGGPORT returns an error. When we exit with an error during lagg creation, a single failed NIC (which no longer attaches) can prevent lagg creation and other configuration, such as adding an IPv4 address, and thus leave a machine unreachable. - Preserve non-EEXISTS errors for exit status from SIOCSLAGGPORT, in case scripts are looking for it. Hopefully this can be extended if other parts of ifconfig can allow a "soft" failure. - Improve the warning message to mention what lagg and what member are problematic. Reviewed by: jtl, glebius Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D15046
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