802.1x Protocol - NVIDIA Docs

The 802.1x (dot1x) standard describes a way to authenticate hosts (or supplicants) and to allow connection only to a list of allowed hosts pre-configured on an authentication server. The authentication is performed by the switch (authenticator) which negotiates the authentication with a RADIUS server (authentication server). This allows to block traffic from non-authenticated sources.

The 802.1x protocol defines the following roles:

Supplicant – the host. It provides the authentication credentials to the authenticator and awaits approval.
Authenticator – the device that connects the supplicant to the network, and checks the authentication with the authentication server. The authenticator is also in charge of blocking and isolating of new client till authenticated and allowing communication once the client has passed the authentication. The switch acts as an authenticator.
Authentication server – a RADIUS server which can authenticate the user.

Warning

The 802.1x is available only on access physical ports. It is not available on LAG and MLAG ports.

Warning

A local analyzer port cannot support 802.1x protocol.

Warning

802.1x cannot be activated on router port interfaces.

Warning

802.1x cannot run on a port configured to switchport trunk or hybrid.

Warning

Management interfaces cannot be configured as 802.1x port access entity (PAE) authenticators.

802.1x Operating Modes

The following operating modes are supported in 802.1x:

Single host – only one supplicant can communicate through the port.Once authentication of the supplicant is accepted by the authentication server, the switch allows it access. If the supplicant logs off or the port state is changed, the port becomes unauthenticated. And if a different supplicant tries to access through this port, its bidirectional traffic is discarded (including authentication traffic).

Note

An exception to this is multicast and broadcast traffic which do get transmitted over the interface once authenticated and are exposed to an unauthorized supplicant if it exists.
Multi-host mode – allows connection of multiple hosts over a single port. Only the first supplicant is authenticated. Subsequent hosts have network access without the need to authenticate.

Configuring 802.1x

Enable 802.1x protocol.

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            switch (config) # protocol dot1x

Enable the system as authenticator.

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            switch (config) # dot1x system-auth-control

Configure RADIUS server parameters.

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            switch (config) # dot1x radius-server host 10.10.10.10 key my4uth3nt1c4t10nk3y retransmit 2 timeout 3

Enter the configuration mode of an Ethernet interface.

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            switch (config) # interface ethernet 1/1
switch (config interface ethernet 1/1) #

Configure the interface as a port access entity authenticator.

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            switch (config interface ethernet 1/1) # dot1x pae authenticator

Configure the interface to perform authentication on ingress traffic.

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            switch (config interface ethernet 1/1) # dot1x port-control auto

Verify 802.1x configuration.

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            switch (config interface ethernet 1/1) # show dot1x interfaces ethernet 1/1
 
Eth1/1
  PAE Status:                      Enabled
  Configured host mode:            Multi-host
  Configured port-control:         Auto
  Authentication status:           Unauthorized
  Re-Authentication:               Disabled
  Re-Authentication period (sec):  -
  Tx wait period (sec):            30
  Quiet period (sec):              60
  Max request retry:               2
  Last EAPOL RX source MAC:        00:00:00:00:00:00

Dot1x Commands

protocol dot1x

	protocol dot1x no protocol dot1x Enables 802.1x EAPOL protocol. The no form of the command disables 802.1x EAPOL protocol.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config
History	3.4.2008
Example	switch (config)# protocol dot1x
Related Commands
Notes

dot1x clear-statistics

	dot1x clear-statistics Resets the 802.1x counters on all or a specific port.
Syntax Description	N/A
Default	N/A
Configuration Mode	config config interface ethernet
History	3.4.2008
Example	switch (config)# dot1x clear-statistics
Related Commands
Notes

dot1x pae authenticator

	dot1x pae authenticator no dot1x pae authenticator Configures the port as a 802.1x port access entity (PAE) authenticator. The no form of the command disables the port from being a 802.1x PAE authenticator.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config interface ethernet
History	3.4.2008
Example	switch (config interface ethernet 1/2)# dot1x system-auth-control
Related Commands
Notes

dot1x host-mode

	dot1x host-mode [multi-host \| single-host] no dot1x host-mode Configures the authentication mode to either multi-host or single-host. The no form of the command resets the parameter to its default.
Syntax Description	multi-host	Sets the interface to operate in a port-based mode
Syntax Description	single-host	Sets the interface to operate in a MAC-based mode with support of a single supplicant per interface
Default	single-host
Configuration Mode	config interface ethernet
History	3.4.2008
History	3.4.2300	Added “single-host” option
Example	switch (config interface ethernet 1/2)# dot1x host-mode single-host
Related Commands
Notes

dot1x port-control

	dot1x port-control [auto \| force-authorized \| force-unauthorized] no dot1x port-control Configures 802.1x port access entity (PAE) port-control. The no form of the command resets the parameter to its default.
Syntax Description	auto	The authenticator uses PAE authentication services to allow or block the port traffic
	force-authorized	Allows traffic on this port regardless of supplicant authorization
	force-unauthorized	Blocks traffic on this port regardless of supplicant authorization
Default	Force-authorized
Configuration Mode	config interface ethernet
History	3.4.2008
Example	switch (config interface ethernet 1/2)# dot1x port-control auto
Related Commands
Notes

dot1x radius-server host

	dot1x radius-server host <IP address> [enable \| auth-port <port> \| key <password> \| prompt-key \| retransmit <retries> \| timeout <seconds>] no dot1x radius-server host <IP address> enable Configure 802.1x RADIUS server IP address. The no form of the command disables 802.1x RADIUS server.
Syntax Description	auth-port	Sets 802.1x RADIUS port to use with this server Range: 1-65535
	enable	Sets 802.1x RADIUS as administratively enabled
	key	Configures 802.1x global RADIUS shared secret for servers
	prompt-key	Prompts for key, rather than entering on command line
	retransmit	Configure 802.1x global RADIUS retransmit count for servers Range: 0-5 seconds
	timeout	Configures 802.1x global RADIUS timeout value for servers Range: 1-60 seconds
Default	auth-port: 1812 key: empty string retransmit: 1 timeout: 3
Configuration Mode	config
History	3.4.2008
Example	switch (config)# dot1x radius-server host 10.10.10.10 auth-port 65535 prompt-key enable
Related Commands
Notes	The no form of the various parameters resets them to their default values as indicated in the Default section above It is possible to configure up to 5 RADIUS servers It is possible to configure only 1 authentication port per RADIUS server IP

dot1x reauthenticate

	dot1x reauthenticate no dot1x reauthenticate Enables supplicant re-authentication according to the configuration of command “dot1x timeout reauthentication”. The no form of the command disables supplicant re-authentication.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config interface ethernet
History	3.4.2008
Example	switch (config interface ethernet 1/2)# dot1x reauthenticate
Related Commands
Notes

dot1x system-auth-control

	dot1x system-auth-control no dot1x system-auth-control Enables the system as authenticator. The no form of the command disables the system as authenticator.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config
History	3.4.2008
Example	switch (config)# dot1x system-auth-control
Related Commands
Notes

dot1x timeout reauthentication

	dot1x timeout reauthentication <period> no dot1x timeout reauthentication Configures the number of seconds between re-authentication attempts. The no form of the command resets the parameter to its default.
Syntax Description	period	Time in second Range: 1-65535
Default	3600 seconds
Configuration Mode	config interface ethernet
History	3.4.2008
Example	switch (config interface ethernet 1/2)# dot1x timeout reauthentication 3600
Related Commands
Notes

dot1x timeout quiet-period

	dot1x timeout quiet-period <period> no dot1x timeout quiet-period Configures the number of seconds that the authenticator remains quiet following a failed authentication exchange with the supplicant. The no form of the command resets the parameter to its default.
Syntax Description	period	Time in second Range: 1-65535
Default	60 seconds
Configuration Mode	config interface ethernet
History	3.4.2008
Example	switch (config interface ethernet 1/2)# dot1x timeout quiet-period 60
Related Commands
Notes

dot1x timeout tx-period

	dot1x timeout tx-period <period> no dot1x timeout tx-period Configures the maximum number of seconds that the authenticator waits for supplicant response of EAP-request/identify frame before retransmitting the request. The no form of the command resets the parameter to its default.
Syntax Description	period	Time in second Range: 1-65535
Default	30 seconds
Configuration Mode	config interface ethernet
History	3.4.2008
Example	switch (config interface ethernet 1/2)# dot1x timeout quiet-period 30
Related Commands
Notes

dot1x max-req

	dot1x max-req <retries> no dot1x max-req Configures the maximum amount of retries for the authenticator to communicate with the supplicant over EAP. The no form of the command resets the parameter to its default.
Syntax Description	retries	The number of request retries Range: 1-10
Default	2
Configuration Mode	config interface ethernet
History	3.4.2008
Example	switch (config interface ethernet 1/2)# dot1x max-req 2
Related Commands
Notes

show dot1x

	show dot1x Displays 802.1x information on all interfaces.
Syntax Description	N/A
Default	N/A
Configuration Mode	Any command mode
History	3.4.2008
Example
switch (config)# show dot1x System authentication is enabled --------------------------------------------------------------------- Port Pae Host-mode Port-control Status --------------------------------------------------------------------- Eth1/1 Enabled multi-host auto unauthorized Eth1/2 Disabled multi-host force-authorized down Eth1/3 Disabled multi-host force-authorized down Eth1/4 Disabled multi-host force-authorized down Eth1/5 Disabled multi-host force-authorized down Eth1/6 Disabled multi-host force-authorized down Eth1/7 Disabled multi-host force-authorized down Eth1/8 Disabled multi-host force-authorized down Eth1/9 Disabled multi-host force-authorized down ...
Related Commands
Notes

show dot1x interfaces ethernet

	show dot1x interfaces ethernet <slot>/<port> Displays 802.1x interface information.
Syntax Description	<slot>/<port>	Ethernet interface
Default	N/A
Configuration Mode	Any command mode
History	3.4.2008
Example	switch (config)# show dot1x interfaces ethernet 1/2 Eth1/2 PAE Status: Enabled Configured host mode: Multi-host Configured port-control: Auto Authentication status: Unauthorized Re-Authentication: Enabled Re-Authentication period (sec): 3600 Tx wait period (sec): 30 Quiet period (sec): 60 Max request retry: 2 Last EAPOL RX source MAC: 00:00:00:00:00:00
Related Commands
Notes

show dot1x interfaces ethernet statistics

	show dot1x interfaces ethernet <slot>/<port> statistics Displays 802.1x interface information.
Syntax Description	<slot>/<port>	Ethernet interface
Default	N/A
Configuration Mode	Any command mode
History	3.4.2008
Example
switch (config)# show dot1x interfaces ethernet 1/2 statistics Eth1/2 EAPOL frames received: 3 EAPOL frames transmitted: 2 EAPOL Start frames received: 1 EAPOL Logoff frames received: 0 EAP Response-ID frames received: 2 EAP Response frames received: 0 EAP Request-ID frames transmitted: 2 EAP Request frames transmitted: 0 Invalid EAPOL frames received: 0 EAP length error frames received: 0 Last EAPOL frame version: 1 Last EAPOL frame source: 00:1a:a0:02:e9:8e
Related Commands
Notes

show dot1x radius

	show dot1x radius Displays 802.1x RADIUS settings.
Syntax Description	N/A
Default	N/A
Configuration Mode	Any command mode
History	3.4.2008
Example	switch (config)# show dot1x radius 802.1x RADIUS defaults: Key: ******** Timeout: 3 Retransmit: 1 No 802.1x RADIUS servers configured.
Related Commands
Notes

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