Cisco released a set of tool to investigate Cisco devices

https://tools.cisco.com/security/center/resources/iosxe_forensic_guide

https://tools.cisco.com/security/center/resources/ios_forensic_investigation

https://tools.cisco.com/security/center/resources/ftd_forensic_investigation

https://tools.cisco.com/security/center/resources/asa_forensic_investigation

https://tools.cisco.com/security/center/tacticalresources.x

https://tools.cisco.com/security/center/resources/asa_forensic_investigation

Digital Forensics Tool Catalog  https://toolcatalog.nist.gov/search/index.php?ff_id=16