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Knowledge Base

Smarts IP: What modes of encryption are supported for SNMP v3 discovery? AES, DES, 3DES or AES256? (358463)

Last Updated: 3/13/2019Categories: TroubleshootingTotal Views: 8323Language:
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Symptoms

Is AES 128-bit encryption supported for SNMP v3 discovery in Smarts IP?

What other protocols are supported for Smarts snmp v3 including the snmpwalk v3 command?

Purpose

Currently the snmpwalk --help does not list all of the supported protocols as shown below

SNMP Version 3 specific

-a PROTOCOL           set authentication protocol (MD5|SHA)

-A PASSPHRASE         set authentication protocol pass phrase

-e ENGINE-ID          set security engine ID (e.g. 800000020109840301)

-E ENGINE-ID          set context engine ID (e.g. 800000020109840301)

-l LEVEL              set security level (noAuthNoPriv|authNoPriv|authPriv)

-n CONTEXT            set context name (e.g. bridge1)

-u USER-NAME          set security name (e.g. bert)

-x PROTOCOL           set privacy protocol (DES|AES)

-X PASSPHRASE         set privacy protocol pass phrase

Cause

Our current documentation from the IP 9.2. Confguration Guide lists AES only and this is known as AES128 which is defined in RFC 3826

Impact / Risks

None

Resolution

Yes, AES 128-bit encryption is supported by default.

Smarts 9.4.2.x and newer also support the following protocols for snmp v3:

DES/3DES/AES/AES128/AES192/ AES256 / NONE

See the additional notes below regarding DES and 3DES from CISCO

Related Information

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/snmp/configuration/xe-3s/asr903/snmp-xe-3s-asr903-book/nm-snmp-encrypt-snmp-support.pdf

The AES Cipher Algorithm in theSimple Network ManagementProtocol (SNMP) User-basedSecurity Model (USM) draft describes the use of AES with 128-bit key size. However, the other options are also implemented with the extension to use the USM. There is no standard for generating localized keys for 192- or 256-bit size keys for AES or for 168-bit size key for 3-DES. There is no authentication protocol available for longer keys. Support for SNMP Version 3 USM is compliant 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 supports the selection of privacy protocols through the CLI and the MIB. A new standard MIB, SNMP-USM-AES-MIB, provides support for the 128-bit key in the Advanced Encryption Standard (AES). The extended options of AES with 192- or 256-bit keys and 3-DES are supported as extensions to the SNMP-USM-MIB in the Cisco-specific MIB—CISCO-SNMP-USM-EXT-MIB

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