Here's the definitive way to get the stinking serial number: sh inventory | i SN show inventory (pipe character) i (search term after i) SN Here's the output: PID: ASA5506 , VID: V06 , SN: JMX23XXXX (I've replaced numbers with X's for security). PID: ASA5506-SSD , VID: N/A , SN: xxxxxxxxx (I've replaced numbers with X's for security). God knows why Cisco couldn't make this simpler. My show run and the chassis match but they are for the "child" serial number. The "real" serial number or "parent" serial number required for support is on the show inventory near keyword SN.
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