Cisco Cisco IOS Software Release 12.4(2)T

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AES and 3-DES Encryption Support for SNMP 
Version 3

12.4(2)T 
12.2(33)SRB

The AES and 3-DES Encryption Support for SNMP Version 
3 feature enhances the encryption capabilities of SNMP 
version 3. DES support was introduced in Cisco IOS 
Release 12.0 and expanded in Cisco IOS Release 12.1. This 
support for SNMP version 3 USM is complaint with RFC 
3414, which defines DES as the only required method of 
message encryption for SNMP version 3 authPriv mode. 

The AES and 3-DES Encryption Support for SNMP Version 
3 feature adds AES 128-bit encryption in compliance with 
RFC 3826. 

AES and 3-DES Encryption Support for SNMP Version 3 
was introduced in Cisco IOS Release 12.4(2)T.

AES and 3-DES Encryption Support for SNMP Version 3 
was integrated into Cisco IOS Release 12.2(33)SRB.