Hi Jamal,   Looks like you need update your software.  According to the release notes, the macsec feature is not supported in Cisco IOS XE Release 3.3.0SE.   Looks like you need at least 3.7.X or 16.X.X   source:  https://www.cisco.com/c/en/us/suppor...

Thank you, Zuitek!

Hi Ziutek, Are you sure this is on the C3850-NM-2-10G (not to be confused with the C3850-NM-4-10G)? Also, can you confirm what version software are you using?  Thank you,

Seems specific documents are not made readily available for civilians like me.  Either Cisco doesn't offer them any more, or I have to work directly for a 3-letter agency to obtain one.  Here is the generic version that may suffice, in case anyone el...

Did you ever find this?  I too, am looking for this for the WS-SUP720-3B.