Use the radius-server host Global Configuration mode command to configure a RADIUS server host. Use the no form of the command to delete the specified RADIUS server host.

Syntax

radius-server host {ip-address | hostname} [auth-port auth-port-number] [acct-port acct-port-number] [timeout timeout] [retransmit retries] [deadtime deadtime] [key key-string] [priority priority] [usage {login | dot1.x | all}]

encrypted radius-server host {ip-address | hostname} [auth-port auth-port-number] [acct-port acct-port-number] [timeout timeout] [retransmit retries] [deadtime deadtime] [key encrypted-key-string] [priority priority] [usage {login | dot1.x | all}]

no radius-server host {ip-address | hostname}

Parameters

• ip-address—Specifies the RADIUS server host IP address. The IP address can be an IPv4, IPv6 or IPv6z address.

• hostname—Specifies the RADIUS server host name. Translation to IPv4 addresses only is supported. (Length: 1–158 characters. Maximum label length of each part of the hostname: 63 characters)

• auth-port auth-port-number—Specifies the port number for authentication requests. If the port number is set to 0, the host is not used for authentication. (Range: 0–65535)

• acct-port acct-port-number—Port number for accounting requests. The host is not used for accountings if set to 0. If unspecified, the port number defaults to 1813.

• timeout timeout—Specifies the timeout value in seconds. (Range: 1–30)

• retransmit retries—Specifies the number of retry retransmissions (Range: 1–15)

• deadtime deadtime—Specifies the length of time in minutes during which a RADIUS server is skipped over by transaction requests. (Range: 0–2000)

• key key-string—Specifies the authentication and encryption key for all RADIUS communications between the device and the RADIUS server. This key must match the encryption used on the RADIUS daemon. To specify an empty string, enter "". (Length: 0–128 characters). If this parameter is omitted, the globally-configured radius key will be used.

• key encrypted-key-string—Same as key-string, but the key is in encrypted format.

• priority priority—Specifies the order in which servers are used, where 0 has the highest priority. (Range: 0–65535)

• usage {login | dot1.x | all}—Specifies the RADIUS server usage type. The possible values are:

  login—Specifies that the RADIUS server is used for user login parameters authentication.

  dot1.x—Specifies that the RADIUS server is used for 802.1x port authentication.

  all—Specifies that the RADIUS server is used for user login authentication and 802.1x port authentication.

Default Configuration

The default authentication port number is 1812.

If timeout is not specified, the global value (set in the command) is used.

If retransmit is not specified, the global value (set in the command) is used.

If key-string is not specified, the global value (set in the command) is used.

If the usage keyword is not specified, the all argument is applied.

Command Mode

Global Configuration mode

User Guidelines

To specify multiple hosts, this command is used for each host.

Example

The following example specifies a RADIUS server host with IP address 192.168.10.1, authentication request port number 20, and a 20-second timeout period.

switchxxxxxx(config)# radius-server host 192.168.10.1 auth-port 20 timeout 20

Use the radius-server key Global Configuration mode command to set the authentication key for RADIUS communications between the device and the RADIUS daemon. Use the no form of this command to restore the default configuration.

Syntax

radius-server key [key-string]

encrypted radius-server key [encrypted-key-string]

no radius-server key

Parameters

• key-string—Specifies the authentication and encryption key for all RADIUS communications between the device and the RADIUS server. This key must match the encryption used on the RADIUS daemon. (Range: 0–128 characters)

• encrypted-key-string—Same as the key-string parameter, but the key is in encrypted form.

Default Configuration

The key-string is an empty string.

Command Mode

Global Configuration mode

Example

The following example defines the authentication key for all RADIUS communications between the device and the RADIUS daemon.

switchxxxxxx(config)# radius-server key enterprise-server

Use the radius-server retransmit Global Configuration mode command to specify the number of times the software searches the list of RADIUS server hosts. Use the no form of this command to restore the default configuration.

Syntax

radius-server retransmit retries

no radius-server retransmit

Parameters

• retransmit retries—Specifies the number of retry retransmissions (Range: 1–15).

Default Configuration

The software searches the list of RADIUS server hosts 3 times.

Command Mode

Global Configuration mode

Example

The following example configures the number of times the software searches all RADIUS server hosts as 5.

switchxxxxxx(config)# radius-server retransmit 5

Use the radius-server host source-interface Global Configuration mode command to specify the source interface whose IPv4 address will be used as the Source IPv4 address for communication with IPv4 RADIUS servers. Use the no form of this command to restore the default configuration.

Syntax

radius-server host source-interface interface-id

no radius-server host source-interface

Parameters

• interface-id—Specifies the source interface.

Default Configuration

The source IPv4 address is the IPv4 address defined on the outgoing interface and belonging to next hop IPv4 subnet.

Command Mode

Global Configuration mode

User Guidelines

If the source interface is the outgoing interface, the interface IP address belonging to next hop IPv4 subnet is applied.

If the source interface is not the outgoing interface, the minimal IPv4 address defined on the source interface is applied.

If there is no available IPv4 source address, a SYSLOG message is issued when attempting to communicate with an IPv4 RADIUS server.

OOB cannot be defined as a source interface.

Example

The following example configures the VLAN 10 as the source interface.

switchxxxxxx(config)# radius-server host source-interface vlan 100

Use the radius-server host source-interface-ipv6 Global Configuration mode command to specify the source interface whose IPv6 address will be used as the source IPv6 address for communication with IPv6 RADIUS servers. Use the no form of this command to restore the default configuration.

Syntax

radius-server host source-interface-ipv6 interface-id

no radius-server host source-interface-ipv6

Parameters

• interface-id—Specifies the source interface.

Default Configuration

The IPv6 source address is the IPv6 address defined on the outgoing interface and selected in accordance with RFC6724.

Command Mode

Global Configuration mode

User Guidelines

If the source interface is the outgoing interface, the source IPv6 address is an IPv6 address defined on the interfaces and selected in accordance with RFC 6724.

If the source interface is not the outgoing interface, the source IPv6 address is the minimal IPv6 address defined on the source interface and matched to the scope of the destination IPv6 address is applied.

If there is no available source IPv6 address, a SYSLOG message is issued when attempting to communicate with an IPv6 RADIUS server.

Example

The following example configures the VLAN 10 as the source interface.

switchxxxxxx(config)# radius-server host source-interface-ipv6 vlan 100

Use the radius-server timeout Global Configuration mode command to set how long the device waits for a server host to reply. Use the no form of this command to restore the default configuration.

Syntax

radius-server timeout timeout-seconds

no radius-server timeout

Parameters

• timeout timeout-seconds—Specifies the timeout value in seconds. (Range: 1–30).

Default Configuration

The default timeout value is 3 seconds.

Command Mode

Global Configuration mode

Example

The following example sets the timeout interval on all RADIUS servers to 5 seconds.

switchxxxxxx(config)# radius-server timeout 5

Use the radius-server deadtime Global Configuration mode command to configure how long unavailable RADIUS servers are skipped over by transaction requests. This improves RADIUS response time when servers are unavailable. Use the no form of this command to restore the default configuration.

Syntax

radius-server deadtime deadtime

no radius-server deadtime

Parameters

• deadtime—Specifies the time interval in minutes during which a RADIUS server is skipped over by transaction requests. (Range: 0–2000).

Default Configuration

The default deadtime interval is 0.

Command Mode

Global Configuration mode

Example

The following example sets all RADIUS server deadtimes to 10 minutes.

switchxxxxxx(config)# radius-server deadtime 10

Use the show radius-servers Privileged EXEC mode command to display the RADIUS server settings.

Syntax

show radius-servers

Command Mode

Privileged EXEC mode

Example

The following example displays RADIUS server settings:

switchxxxxxx# show radius-servers
IP address  Port Port Time                Dead    Deadtime
            Auth Acc  Out   Retransmission time     status     Priority Usage
----------  ---- ---- ----  ------------- ------    ------    -------- -----
172.16.1.1  1812 1813  125  Global        Global     Dead        1      All
172.16.1.2  1812 1813  102  8             Global      Up         2      All
Global values
--------------
TimeOut: 3
Retransmit: 3
Deadtime: 0
Source IPv4 interface: vlan 120
Source IPv6 interface: vlan 10

Use the show radius-servers key Privileged EXEC mode command to display the RADIUS server key settings.

Syntax

show radius-servers key

Command Mode

Privileged EXEC mode

Example

The following example displays RADIUS server key settings.