These changes provide for the automatic shutdown of NIF ports on LC when an ungraceful reboot scenario occurs. Reboot and panic notifier hooks are now registered so that callback occurs from the kernel and NIF ports are subsequently shut down.
Why I did it
To facilitate the timely movement of traffic away from a crashed LC when its peers recognize that the associated links have gone down.
How I did it
Linux kernel reboot and panic notifier hooks are used to register a callback routine that, when invoked, stuffs all present transceiver modules into reset.
How to verify it
Cause an ungraceful reboot (whether via /usr/sbin/reboot or by causing a kernel panic) and verify that all LC native NIF links are brought down at reboot/panic time (on the way down). It may be necessary to monitor the LC link peer(s) in order to verify in real-time.
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