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Example of Enabling Authentication from the RADIUS Server
Dell(config)# aaa authentication enable default radius tacacs
Radius and TACACS server has to be properly setup for this.
Dell(config)# radius-server host x.x.x.x key <some-password>
Dell(config)# tacacs-server host x.x.x.x key <some-password>
To use local authentication for enable secret on the console, while using remote authentication on VTY lines, issue the
following commands.
Example of Enabling Local Authentication for the Console and Remote Authentication for VTY Lines
Dell(config)# aaa authentication enable mymethodlist radius tacacs
Dell(config)# line vty 0 9
Dell(config-line-vty)# enable authentication mymethodlist
Server-Side Configuration
● TACACS+ — When using TACACS+, Dell Networking OS sends an initial packet with service type SVC_ENABLE, and then
sends a second packet with just the password. The TACACS server must have an entry for username $enable$.
● RADIUS — When using RADIUS authentication, Dell Networking OS sends an authentication packet with the following:
Username: $enab15$
Password: <password-entered-by-user>
Therefore, the RADIUS server must have an entry for this username.
Configuring Re-Authentication
Starting from Dell EMC Networking OS 9.11(0.0), the system enables re-authentication of user whenever there is a change in
the authenticators.
The change in authentication happens when:
● Add or remove an authentication server (RADIUS/TACACS+)
● Modify an AAA authentication/authorization list
● Change to role-only (RBAC) mode
The re-authentication is also applicable for authenticated 802.1x devices. When there is a change in the authetication servers,
the supplicants connected to all the ports are forced to re-authenticate.
1. Enable the re-authentication mode.
CONFIGURATION mode
aaa reauthentication enable
2. You are prompted to force the users to re-authenticate while adding or removing a RADIUS/TACACS+ server.
CONFIGURATION mode
aaa authentication login method-list-name
Example:
DellEMC(config)#aaa authentication login vty_auth_list radius
Force all logged-in users to re-authenticate (y/n)?
3. You are prompted to force the users to re-authenticate whenever there is a change in the RADIUS server list..
CONFIGURATION mode
radius-server host IP Address
Security
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