Reference Guide

Security
This chapter describes several ways to provide access security to the Dell Networking system.
For details about all the commands described in this chapter, refer to the Security chapter in the Dell Networking OS Command
Reference Guide.
Topics:
• Role-Based Access Control
• AAA Accounting
• AAA Authentication
• Obscuring Passwords and Keys
• AAA Authorization
• RADIUS
• TACACS+
• Protection from TCP Tiny and Overlapping Fragment Attacks
• Enabling SCP and SSH
• Telnet
• VTY Line and Access-Class Configuration
Role-Based Access Control
With Role-Based Access Control (RBAC), access and authorization is controlled based on a user’s role. Users are granted
permissions based on their user roles, not on their individual user ID. User roles are created for job functions and through those
roles they acquire the permissions to perform their associated job function.
This section contains the following sections:
● Overview of RBAC
● Privilege-or-role Mode versus Role-only Mode
● Configuring Role-based Only AAA Authorization
● System-Defined RBAC User Roles
● User Roles
● Role Accounting
● AAA Authentication and Authorization for Roles
● Display Information About User Roles
Overview of RBAC
With Role-Based Access Control (RBAC), access and authorization is controlled based on a user’s role. Users are granted
permissions based on their user roles, not on their individual user ID. User roles are created for job functions and through those
roles they acquire the permissions to perform their associated job function. Each user can be assigned only a single role. Many
users can have the same role.
The Dell Networking OS supports the constrained RBAC model. With a constrained RBAC model, you can inherit permissions
when you create a new user role, restrict or add commands a user can enter and the actions the user can perform. This allows
for greater flexibility in assigning permissions for each command to each role and as a result, it is easier and much more efficient
to administer user rights. If a user’s role matches one of the allowed user roles for that command, then command authorization
is granted.
47
Security 651