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44 ExtremeWare XOS 10.1 Concepts Guide
Managing the Switch
Users are associated with groups using the following command:
configure snmpv3 add group {hex} <group name> user {hex} <user name> {sec-model
[snmpv1| snmpv2 | usm]} {volatile}
To show which users are associated with a group, use the following command:
show snmpv3 group {{hex} <group name> {user {hex} <user name>}}
To delete a group, use the following command:
configure snmpv3 delete access [all-non-defaults | {{hex} <group name> {sec-model
[snmpv1 | snmpv2c | usm] sec-level [noauth | authnopriv | priv]}}]
When you delete a group, you do not remove the association between the group. To delete the
association between a user and a group, use the following command:
configure snmpv3 delete group {{hex} <group name>} user [all-non-defaults | {{hex}
<user name> {sec-model [snmpv1|snmpv2c|usm]}}]
Security Models and Levels. For compatibility, SNMPv3 supports three security models:
SNMPv1no security
SNMPv2ccommunity strings based security
SNMPv3USM security
The default is User-Based Security Model (USM). You can select the security model based on the
network manager in your network.
The three security levels supported by USM are:
noAuthnoPrivNo authentication, no privacy. This is the case with existing SNMPv1/v2c agents.
AuthnoPrivAuthentication, no privacy. Messages are tested only for authentication.
AuthPrivAuthentication, privacy. This represents the highest level of security and requires every
message exchange to pass the authentication and encryption tests.
When a user is created, an authentication method is selected, and the authentication and privacy
passwords or keys are entered.
When MD5 authentication is specified, HMAC-MD5-96 is used to achieve authentication with a 16-octet
key, which generates an 128-bit authorization code. This code is inserted in
msgAuthenticationParameters field of SNMPv3 PDUs when the security level is specified as either
AuthnoPriv or AuthPriv. Specifying SHA authentication uses the HMAC-SHA protocol with a 20-octet
key for authentication.
For privacy, a 16-octet key is provided as input to DES-CBS encryption protocol, which generates an
encrypted PDU to be transmitted. DES uses bytes 1-7 to make a 56 bit key. This key (encrypted itself) is
placed in msgPrivacyParameters of SNMPv3 PDUs when the security level is specified as AuthPriv.
MIB Access Control
SNMPv3 provides a fine-grained mechanism for defining which parts of the MIB can be accessed. This
is referred to as the View-Based Access Control Model (VACM).
MIB views represent the basic building blocks of VACM. They are used to define a subset of the
information in the MIB. Access to read, to write, and to generate notifications is based on the
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