Administrator Guide

Version Description
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.4.1.0 Added support for IPv6.
8.3.7.0 Introduced on the S4810.
7.7.1.0 Authentication key length increased to 42 characters.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
pre-6.2.1.0 Introduced on the E-Series.
Usage
Information
To configure any number of RADIUS server hosts for each server host that is configured, use this
command. Dell Networking OS searches for the RADIUS hosts in the order they are configured in the
software.
The global default values for the timeout, retransmit, and key optional parameters are applied,
unless those values are specified in the radius-server host or other commands. To return to
the global default values, if you configure the timeout, retransmit, or key values, include those
keywords when using the no radius-server host command syntax.
You can use duplicate host names or IP addresses among RADIUS groups. However, you cannot use
duplicate host names or IP addresses within the same RADIUS group. If a VRF is not configured on the
RADIUS group, then servers configured in the group are considered to be on the default VRF. RADIUS
servers that are configured in the CONFIGURATION mode are also considered to be on the default VRF.
You must configure the RADIUS group explicitly with the aaa radius group command in order for the
AAA servers to use the group of RADIUS servers. The 802.1x servers use the group of RADIUS servers
based on the VRF where the 802.1x request is received. As a result, it is possible that both globally
configured RADIUS servers as well as the group-configured RADIUS servers (without VRF or default
VRF) are used for processing the 802.1x requests that are received at the default VRF. The order in
which the RADIUS servers are tried depends on the order in which the RADIUS servers are configured.
Example
Dell(conf)#radius-server group group1
Dell(conf-radius-group)#radius-server host 1.1.1.1 key secret
Dell(conf-radius-group)#no radius-server host 1.1.1.1
Related
Commands
login authentication — sets the database to be checked when a user logs in.
radius-server key — sets an authentication key for RADIUS communications.
radius-server retransmit — sets the number of times the RADIUS server attempts to send information.
radius-server timeout — sets the time interval before the RADIUS server times out.
radius-server key
Configure a key for all RADIUS communications between the switch and the RADIUS host server.
Syntax
radius-server key [encryption-type] key
To delete a password, use the no radius-server key command.
Parameters
encryption-type (OPTIONAL) Enter either zero (0) or 7 as the encryption type for the key entered.
The options are:
● 0 is the default and means the key is not encrypted and stored as clear text.
● 7 means that the key is encrypted and hidden.
key Enter a string that is the key to be exchanged between the switch and RADIUS
servers. It can be up to 42 characters long.
1116 Security