Brocade ICX 6650 Administration Guide 159
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User-based security model 6
User-based security model
SNMP version 3 (RFC 2570 through 2575) introduces a User-Based Security model (RFC 2574) for
authentication and privacy services.
SNMP version 1 and version 2 use community strings to authenticate SNMP access to
management modules. This method can still be used for authentication. In SNMP version 3, the
User-Based Security model of SNMP can be used to secure against the following threats:
•Modification of information
•Masquerading the identity of an authorized entity
•Message stream modification
•Disclosure of information
SNMP version 3 also supports View-Based Access Control Mechanism (RFC 2575) to control
access at the PDU level. It defines mechanisms for determining whether or not access to a
managed object in a local MIB by a remote principal should be allowed. (refer to “SNMP v3
configuration examples” on page169.)

Configuring your NMS

In order to use the SNMP version 3 features.
1. Make sure that your Network Manager System (NMS) supports SNMP version 3.
2. Configure your NMS agent with the necessary users.
3. Configure the SNMP version 3 features in Brocade ICX 6650 devices.

Configuring SNMP version 3 on Brocade ICX 6650 devices

Follow the steps given below to configure SNMP version 3 on Brocade devices.
1. Enter an engine ID for the management module using the snmp-server engineid command if
you will not use the default engine ID.Refer to “Defining the engine id” on page159.
2. Create views that will be assigned to SNMP user groups using the snmp-server view command.
refer to “SNMP v3 configuration examples” on page169 for details.
3. Create ACL groups that will be assigned to SNMP user groups using the access-list command.
4. Create user groups using the snmp-server group command.Refer to “Defining an SNMP group”
on page 160.
5. Create user accounts and associate these accounts to user groups using the snmp-server user
command.Refer to “Defining an SNMP user account” on page161.
If SNMP version 3 is not configured, then community strings by default are used to authenticate
access.

Defining the engine id

A default engine ID is generated during system start up. To determine what the default engine ID of
the device is, enter the show snmp engineid command and find the following line:
Local SNMP Engine ID: 800007c70300e05290ab60