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The AES and 3-DES Encryption Support for SNMP Version 3feature enhances the encryption capabilities of SNMP version 3. This support for Simple Network Management Protocol (SNMP) version 3 User-Based Security Model (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 Advanced Encryption Standard (AES) 128-bit encryption in compliance with RFC 3826. RFC 3826 extensions have been included in the SNMP-USM-AES-MIB. In addition, Cisco-specific extensions to support Triple-Data Encryption Algorithm (3-DES) and AES 192-bit and 256-bit encryption have been added to the CISCO-SNMP-USM-MIB. Additional information can be found in the Internet-Draft titled Extension to the User-Based Security Model (USM) to Support Triple-DES EDE in “Outside” CBC Mode, which can be found at the following URL: http://www.snmp.com/eso/draft-reeder-snmpv3-usm-3desede-00.txt.
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
The architecture for describing Internet Management Frameworks contained in RFC 3411 describes the SNMP engine as composed of the following components:
Applications make use of the services of these subsystems. It is important to understand the SNMP architecture and the terminology of the architecture to understand where the Security Model fits into the architecture and interacts with the other subsystems within the architecture. The information is contained in RFC 3411 and your are encouraged to review this RFC to obtain an understanding of the SNMP architecture and subsystem interactions.
In the AES and 3-DES Encryption Support for SNMP Version 3 feature the Cipher Block Chaining/Data Encryption Standard (CBC-DES) is the privacy protocol. Originally only DES was supported (as per RFC 3414). This feature adds support for AES-128 (as per RFC 3826) and AES-192, AES-256 and 3-DES (as per CISCO-SNMP-USM-OIDS-MIB).
The AES Cipher Algorithm in the SNMP User-based Security Model 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 currently 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 with longer keys.
The AES and 3-DES Encryption Support for SNMP Version 3AES and 3-DES Encryption Support for SNMP Version 3 feature supports the selection of privacy protocols through the CLI and the Management Information Base (MIB). A new standard MIB, SNMP-USM-AES-MIB, provides support for the 128-bit key in 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-OIDS-MIB.
1. enable
2. configure terminal
3. snmp-server user username group-name [remote host [udp-port port]] {v1 | v2c | v3 [encrypted] [auth {md5 | sha} auth-password]} [priv {des | 3des | aes {128 | 192 |256}} privpassword] [access [ipv6 nacl] {acl-number | acl-name}]
To display information about the configured characteristics of Simple Network Management Protocol (SNMP) users, use the show snmp user command in privileged EXEC mode.
Note |
The show snmp user command displays all the users configured on the router. However, unlike other SNMP configurations, the snmp-server user command will not appear on the “show running” output. |
1. enable
2. show snmp user [username
Step 1 | enable Enters privileged EXEC mode. Enter your password when prompted. |
Step 2 | show snmp user [username The following example specifies the username as abcd, the engine ID string as 00000009020000000C025808, and the storage type as nonvolatile: Example: Router# show snmp user abcd User name: abcd Engine ID: 00000009020000000C025808 storage-type: nonvolatile active access-list: 10 Rowstatus: active Authentication Protocol: MD5 Privacy protocol: 3DES Group name: VacmGroupName Group name: VacmGroupName |
Related Topic |
Document Title |
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Cisco software commands |
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Cisco Network Management commands |
Cisco IOS Network Management Command Reference |
SNMP configuration |
“ Configuring SNMP Support ” chapter in the Cisco Network Management Configuration Guide |
SNMP Support for VPNs |
SNMP Notification Support for VPNs |
Standard |
Title |
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None |
-- |
MIB |
MIBs Link |
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To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFC |
Title |
---|---|
RFC 1441 |
Introduction to version 2 of the Internet-standard Network Management Framework |
RFC 1442 |
Structure of Management Information for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 1443 |
Textual Conventions for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 1444 |
Conformance Statements for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 1445 |
Administrative Model for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 1446 |
Security Protocols for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 1447 |
Party MIB for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 1448 |
Protocol Operations for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 1449 |
Transport Mappings for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 1450 |
Management Information Base for version 2 of the Simple Network Management Protocol (SNMPv2) |
RFC 2571 |
An Architecture for Describing SNMP Management Frameworks |
RFC 2576 |
Coexistence between Version 1, Version 2, and Version 3 of the Internet-standard Network Management Framework |
Description |
Link |
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The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
---|---|---|
AES and 3-DES Encryption Support for SNMP Version 3 |
Cisco IOS XE Release 2.1 |
The AES and 3-DES Encryption Support for SNMP Version 3 feature enhances the encryption capabilities of SNMP version 3. 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. The following commands were introduced or modified by this feature: show snmp user , snmp-server user |