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The K9 suffix is particularly important: it confirms the presence of strong cryptographic features (SSH, IPSec, TLS), subject to US export regulations but essential for secure modern networks. Without the K9 capability, many security and VPN features simply won’t work.
Each maintenance release (M1, M2, … M10) within the 15.9(3) train fixes dozens of software defects. Release notes for 15.9(3)M10 describe , covering everything from memory leaks and routing protocol instabilities to hardware compatibility issues. Specific examples of issues fixed in the 15.9(3) train include:
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