show platform hardware crypto
As an "M" (Maintenance) release, M7 contains cumulative bug fixes from earlier 15.8(3) versions. Users on Cisco Community C1900-universalk9-mz-spa-158-3-m7-bin
To the uninitiated, it was just a string of alphanumeric gibberish ending in .bin . But to Sarah, that filename was a promise. C1900 meant it was tailored for this specific hardware generation. Universalk9 meant it carried the full heavy lifting of strong cryptography and advanced IP services. 158-3.M7 was the specific release—the culmination of thousands of bug fixes, patched security holes, and optimized routing protocols. show platform hardware crypto As an "M" (Maintenance)
Are you trying to a router to this version, or troubleshoot one? patched security holes