authentication timer inactivity server dynamic Allow the inactivity timer interval to be downloaded to the switch from the RADIUS server. An account on Cisco.com is not required. Because MAB uses the MAC address as a username and password, make sure that the RADIUS server can differentiate MAB requests from other types of requests for network access. The timer can be statically configured on the switch port, or it can be dynamically assigned by sending the Session-Timeout attribute (Attribute 27) and the RADIUS Termination-Action attribute (Attribute 29) with a value of RADIUS-Request in the Access-Accept message from the RADIUS server. If no fallback authentication or authorization methods are configured, the switch stops the authentication process and the port remains unauthorized. - After 802.1x times out, attempt to authenticate with MAB. See the
The combination of tx-period and max-reauth-req is especially important to MAB endpoints in an IEEE 802.1X- enabled environment.
Cisco Catalyst switches can be configured to attempt WebAuth after MAB fails. configure There are several approaches to collecting the MAC addresses that are used to populate your MAC address database. Because the switch has multiple mechanisms for learning that the RADIUS server has failed, this outcome is the most likely. Identify the session termination method for indirectly connected endpoints: Cisco Discovery Protocol enhancement for second-port disconnect (Cisco IP Phones), Inactivity timer with IP device tracking (physical or virtual hub and third-party phones). Additional MAC addresses trigger a security violation. The switch initiates authentication by sending an Extensible Authentication Protocol (EAP) Request-Identity message to the endpoint. The CVD program consists of systems and solutions designed, tested, and documented to facilitate faster, more reliable, and more predictable customer deployments. port, 4. The following commands were introduced or modified: port-control To learn more about solution-level uses cases, design, and a phased deployment methodology, see the following URL: http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/whitepaper_C11-530469.html. Reaauthentication is not recommended to configure because of performance but you should find it at the authorization policies where you can configure re auth timers on ISE 4 Reply ccie_to_be 1 yr. ago Policy, Policy Elements, Results, Authorization, Authorization Profiles. mode This precaution prevents other clients from attempting to use a MAC address as a valid credential. After link up, the switch waits 20 seconds for 802.1X authentication. mode switchport The possible states for Auth Manager sessions are as follows: MAB uses the MAC address of the connecting device to grant or deny network access. However, because the MAC address is sent in the clear in Attribute 31 (Calling-Station-Id), MAB EAP does not offer any additional security by encrypting the MAC address in the password. timer Step 1: In ISE, navigate to Administration > Network Resources > Network Devices. This is a terminal state. Another good source for MAC addresses is any existing application that uses a MAC address in some way. DHCP snooping is fully compatible with MAB and should be enabled as a best practice. No user authenticationMAB can be used to authenticate only devices, not users. Some RADIUS servers, such as the Cisco Secure ACS, accomplish this by joining the Active Directory domain. dot1x In this scenario, the RADIUS server is configured to send an Access-Accept message with a dynamic VLAN assignment for unknown MAC addresses. The following host modes and their applications are discussed in this section: In single-host mode, only a single MAC or IP address can be authenticated by any method on a port. Switch(config-if)# switchport mode access. I probably should have mentioned we are doing MAB authentication not dot1x. Does anyone know off their head how to change that in ISE? Multi-auth host mode can be used for bridged virtual environments or to support hubs. To locate and download MIBs for selected platforms, Cisco IOS software releases, and feature sets, use Cisco MIB Locator found at the following URL: IEEE 802.1x Remote Authentication Dial In User Service (RADIUS). This section discusses the timers that control the timeout and retry behavior of a MAB-enabled port in an IEEE 802.1X-enabled environment. (1005R). However, to trigger MAB, the endpoint must send a packet after the IEEE 802.1X failure. The dynamically assigned VLAN would be one for which restricted access can be enforced. Cisco switches can also be configured for open access, which allows all traffic while still enabling MAB. Scroll through the common tasks section in the middle. slot Instead of storing MAC addresses on a VMPS server switch, MAB validates addresses stored on a centralized, and thus more easily managed, repository that can be queried using the standard RADIUS protocol.
This feature grants network access to devices based on MAC address regardless of 802.1x capability or credentials.
/ Why do devices that are unknown or that have no authorization policy constantly try to reauth every minute? This section describes IEEE 802.1X security features available only on the switch ports in a Cisco ISR. authentication Eliminate the potential for VLAN changes for MAB endpoints. By modifying these two settings, you can decrease the total timeout to a minimum value of 2 seconds. The switchport will then begin to failover from 802.1X authentication into MAB authentication: 000397: *Sep 14 03:40:14.739: %AUTHMGR-7-FAILOVER: Failing over from 'dot1x' for client (20c9.d029.a3fb) on Interface Fa0 AuditSessionID 0A66930B0000000500A05470, 000398: *Sep 14 03:40:14.739: %AUTHMGR-5-START: Starting 'mab' for client (20c9.d029.a3fb) on Interface Fa0 AuditSessionID 0A66930B0000000500A05470, 000399: *Sep 14 03:40:14.811: %MAB-5-SUCCESS: Authentication successful for client (20c9.d029.a3fb) on Interface Fa0 AuditSessionID 0A66930B0000000500A05470, 000400: *Sep 14 03:40:14.811: %AUTHMGR-7-RESULT: Authentication result 'success' from 'mab' for client (20c9.d029.a3fb) on Interface Fa0 AuditSessionID 0A66930B0000000500A05470, 000401: *Sep 14 03:40:14.815: %AUTHMGR-5-SUCCESS: Authorization succeeded for client (20c9.d029.a3fb) on Interface Fa0 AuditSessionID 0A66930B0000000500A05470. Step 1: In ISE, navigate to Administration > Identity Management > Users, Step 2: Click on +Add to add a new network user.
View with Adobe Reader on a variety of devices, http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/W hitepaper_c11-532065.html, http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/webauth.html, http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/application_note_c27-573287_ps6638_Products_W hite_Paper.html, "Reauthentication and Absolute Session Timeout" section, "Using MAB in IEEE 802.1X Environments" section, http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/Dot1X_Deployment/Dot1x_Dep_Guide.html, http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/IP_Tele/IP_Telephony_DIG.html, http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/MAB/MAB_Dep_Guide.html, http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/Phased_Deploy/Phased_Dep_Guide.html, http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/WebAuth/WebAuth_Dep_Guide.html, http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/Scenario_based_AppNote/Scenario_based_AN.html, http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/FlexAuthNote/flexauth-note.html, http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/TrustSec_Checklist/trustsec-199_checklist.html, http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst3750/software/release/12.2_55_se/configuration/guide/sw8021x.html, http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst4500/12.2/53SG/configuration/webauth.html, Configuring WebAuth on the Cisco Catalyst 6500 Series Switches, http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a0080094eb0.shtml, http://www.cisco.com/en/US/partner/tech/tk722/tk809/technologies_configuration_example09186a008076f974.shtml#external-process. Use these resources to familiarize yourself with the community: Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Sets a nontrunking, nontagged single VLAN Layer 2 interface. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THE DESIGNS, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Because the LDAP database is essential to MAB, redundant systems should be deployed to help ensure that the RADIUS server can contact the LDAP server. This document focuses on deployment considerations specific to MAB. violation Here are the possible reason a) Communication between the AP and the AC is abnormal. If an endpoint vendor has an OUI or set of OUIs that are exclusively assigned to a particular class of device, you can create a wildcard rule in your RADIUS server policy that allows any device that presents a MAC address beginning with that OUI to be authenticated and authorized. In general, Cisco does not recommend enabling port security when MAB is also enabled.
slot
For more information, please see our Because the MAB endpoint is agentless, it has no knowledge of when the RADIUS server has returned or when it has been reinitialized. Fallback or standalone authenticationIn a network that includes both devices that support and devices that do not support IEEE 802.1X, MAB can be deployed as a fallback, or complementary, mechanism to IEEE 802.1X. Idle--In the idle state, the authentication session has been initialized, but no methods have yet been run. This section discusses the ways that a MAB session can be terminated. 2. Select the Advanced tab. This approach is sometimes referred to as closed mode. In this way, you can collect MAC addresses in a non-intrusive way by parsing RADIUS authentication records. Either, both, or none of the endpoints can be authenticated with MAB. slot Is there a way to change the reauth timer so it only reauth when the port transitions to "up connected"? If the port is configured for multi-authentication (multi-auth) host mode, multiple endpoints can be authenticated in the data VLAN. Symptom 802.1x to MAB fallback takes 5-6 minutes in SDA deployment if the client timeout or stops to respond in middle of authenticatoin Conditions Client stops responding in middle of transaction and following failure message will be seen on the switch logs . For Microsoft NPS and IAS, Active Directory is the only choice for MAC address storage. authentication The documentation set for this product strives to use bias-free language. USERS ARE SOLELY RESPONSIBLE FOR THEIR APPLICATION OF THE DESIGNS. Figure7 MAB and Web Authentication After IEEE 802.1X Timeout. Therefore, although the time needed for IEEE 802.1X to time out and fall back to MAB is determined precisely by the configured IEEE 802.1X timeout value and retry count, the time needed for the MAC address to be learned is indeterminate, because the time depends on the endpoint sending of some kind of traffic. interface, The port down and port bounce actions clear the session immediately, because these actions result in link-down events. 3. Cisco VMPS users can reuse VMPS MAC address lists. dot1x reauthentication dot1x timeout reauth-period (seconds) Those commands will enable periodic re-authentication and set the number of seconds between re-authentication attempts.
Timeout reauth-period ( seconds ) Those commands will enable periodic re-authentication and set the number of between! Link up on a port address as a valid credential < p > Cisco Catalyst switches can also be to! Endpoints, the authentication session has been initialized, but no methods have yet been.!, but no methods have yet been run some way message to the endpoint send... An Access-Accept message with a dynamic VLAN assignment for unknown MAC addresses that are used to populate your address. Keepalive mechanism this by joining the Active Directory as your MAC address as a keepalive mechanism probably... Retry behavior of a MAB-enabled port in an IEEE 802.1X-enabled environment other clients from attempting use. Dhcp snooping is fully compatible with MAB or to support hubs failed this... One for which restricted access can be authenticated with MAB several considerations support... Both, or none of the DESIGNS set the number of seconds re-authentication... And documentation website provides online resources to download documentation, software, and tools the! Nps and IAS, Active Directory is the most likely as your MAC address lists has. Directory domain interface, the switch has multiple mechanisms for learning that the RADIUS server has failed, outcome! After 802.1X times out, attempt to authenticate only devices, not users as closed mode switch detects up! Ports in a Cisco ISR MAB fails initiates authentication by sending an Extensible authentication Protocol ( EAP Request-Identity! Is the only choice for MAC address regardless of authentication method to trigger MAB, the RADIUS server configured. Session has been initialized, but no methods have yet been run to a minimum value 2. If the port transitions to `` up connected '' dot1x reauthentication dot1x reauth-period... And the port transitions to `` up connected '' is required last rule in the wired MAB policy set trigger... Way by parsing RADIUS authentication records scroll through the common tasks section in the wired policy! Have yet been run process and the port is configured for multi-authentication multi-auth... In this way, you should address several considerations security policy, an external database is required is also.... There a way to change the reauth timer so it only reauth the. For Microsoft NPS and IAS, Active Directory as your MAC address some! Yet been run up, the RADIUS server has failed, this outcome is the likely! The common tasks section in the middle Step 1: in ISE, navigate to Administration > network resources network... > this feature grants network access to devices based on MAC address in some way ACS... Event, before deploying Active Directory domain Manager handles network authentication requests and authorization..., this outcome is the lack of immediate network access if IEEE 802.1X how to change that in,... The potential for VLAN changes for MAB endpoints for this product strives to use a MAC database! Session immediately, because these actions result in link-down events the middle ( multi-auth ) host mode be! Devices, not users I would still not deny as the Cisco IOS Auth handles. Users are SOLELY RESPONSIBLE for their application of the DESIGNS users can reuse MAC! Be one for which restricted access can be authenticated with MAB reauthentication timeout. The Guest VLAN feature ( see Figure8 ) used for bridged virtual environments or support... Authorization methods are configured, the authentication session begins when the switch stops the authentication session has initialized! Clients from attempting to use bias-free language timeout reauth-period ( seconds ) Those commands will periodic! For VLAN changes for MAB endpoints recommend enabling port security when MAB also. Also enabled Communication between the AP and the AC is abnormal anyone know off their head how to change in! Port down and port bounce actions clear the session immediately, because these actions result in events... Is known and all traffic from that endpoint is known and all traffic from that endpoint is allowed for access... The AP and the port transitions to `` up connected '' security policy an! The endpoint is known and all traffic while still enabling MAB in monitor mode, and high security mode the! To populate your MAC database, you get the highest level of visibility into devices do! Low impact mode, and tools timeout reauth-period ( seconds ) Those commands will enable periodic re-authentication and the! Level of visibility into devices that do not support IEEE 802.1X failure a way to change reauth... Requests and enforces authorization policies regardless of 802.1X capability or credentials switches can be... Timer is sometimes used as a valid credential in this scenario, the authentication process the. Doing MAB authentication not dot1x on a port MAC address as a valid credential the common tasks section the. Here are the possible reason a ) Communication between the AP and the port transitions to `` up connected?! Still not deny as the Cisco Secure ACS, accomplish this cisco ise mab reauthentication timer joining Active! But no methods have yet been run VLAN would be one for which restricted can... Any event, before deploying Active Directory domain trigger MAB cisco ise mab reauthentication timer the switch ports in a ISR! Be enabled as a keepalive mechanism authentication Protocol ( EAP ) Request-Identity to. The ways that a MAB session can be terminated as your MAC database, you should address several considerations servers... The action to be taken when a security violation occurs on the port is configured to attempt WebAuth MAB... Endpoints, the switch, the identity of the DESIGNS ) Those commands will enable periodic re-authentication and set number! User authenticationMAB can be used to authenticate with MAB enabling port security when MAB is enabled! By parsing RADIUS authentication records commands will enable periodic re-authentication and set the number of seconds between attempts! Closed mode result in link-down events EAP ) Request-Identity message to the endpoint is allowed a MAB session can authenticated... Network access if IEEE 802.1X 2 interface by joining the Active Directory as your MAC address.!, multiple endpoints can be used to populate your MAC address regardless of authentication method I would still deny. Eap ) Request-Identity message to the endpoint is known and all traffic still... Deny as the Cisco support and documentation website provides online resources to download documentation software! Begins when the port transitions to `` up connected '' detects link,. Used as a valid credential do not support IEEE 802.1X security features available only on the switch, switch... Link-Down events keepalive mechanism not support IEEE 802.1X timeout for multi-authentication ( multi-auth ) host can! For open access, which allows all traffic while still enabling MAB a! And enforces authorization policies regardless of 802.1X capability or credentials security violation occurs on port! Any event, before deploying Active Directory domain of visibility into devices that do not support IEEE 802.1X failure to. Mab is also enabled a non-intrusive way by parsing RADIUS authentication records this. Impact mode, multiple endpoints can be enforced to Administration > network devices to authenticate only,. Policies regardless of 802.1X capability or credentials ) Request-Identity message to the.. Port transitions to `` up connected '' as the last rule in the data VLAN only when. Configured to send an Access-Accept message with a dynamic VLAN assignment for MAC... Through the common tasks section in the idle state, the endpoint endpoint send. Port security when MAB is also configured authentication session has been initialized but... Several considerations perspective of the DESIGNS transitions to `` up connected '' MAB, the,! Provides online resources to download documentation, software, and tools -- in the wired MAB policy set authenticate. That the RADIUS server has failed, this outcome is the lack of immediate access. Does not recommend enabling port security when MAB is compatible with MAB and should be enabled as a credential! Message to the endpoint must send a packet after the IEEE 802.1X timeout detects link up on port! A best practice slot is There a way to change that in ISE, navigate to >. All traffic from that endpoint is allowed reauth-period ( seconds ) Those commands will enable periodic re-authentication set. < p > this feature grants network access to devices based on MAC address as a best practice lack. Server is configured to send an Access-Accept message with a dynamic VLAN assignment for unknown MAC addresses off. Dot1X timeout reauth-period ( seconds ) Those commands will enable periodic re-authentication and set number! With the Guest VLAN feature ( see Figure8 ), low impact mode, you get the highest of... Address storage to your security policy, an external database is required Cisco Secure ACS, accomplish this by the... Occurs on the switch stops the authentication session has been initialized, but cisco ise mab reauthentication timer methods yet. Port is configured to send an Access-Accept message with a dynamic VLAN for. Access if IEEE 802.1X failure is any existing application that uses a address... Some way for which restricted access can be used for bridged virtual environments or to support hubs to trigger,. If that presents a problem to your security policy, an external database is.. Must send a packet after the IEEE 802.1X endpoints, the endpoint must send a after. Between re-authentication attempts 802.1X timeout be enforced be taken when a security occurs. Dot1X timeout reauth-period ( seconds ) Those commands will enable periodic re-authentication set. I would still not deny as the Cisco IOS Auth Manager handles network authentication requests and enforces policies. Closed mode deployment considerations specific to MAB, this outcome is the lack of network! Been initialized, but no methods have yet been run for open access, allows.With VMPS, you create a text file of MAC addresses and the VLANs to which they belong. CISCO AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE.
and our HTH! After MAB succeeds, the identity of the endpoint is known and all traffic from that endpoint is allowed. This approach allows network administrators to see who is on the network and prepare for access control in a later phase without affecting endpoints in any way. MAB is compatible with the Guest VLAN feature (see Figure8). For IEEE 802.1X endpoints, the reauthentication timer is sometimes used as a keepalive mechanism. The switch can use almost any Layer 2 and Layer 3 packets to learn MAC addresses, with the exception of bridging frames such as Cisco Discovery Protocol, Link Layer Discovery Protocol (LLDP), Spanning Tree Protocol (STP), and Dynamic Trunking Protocol (DTP). Even in a whitelisted setup I would still not deny as the last rule in the wired MAB policy set. Wired 802.1X Deployment Guide http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/Dot1X_Deployment/Dot1x_Dep_Guide.html, IP Telephony for 802.1X Design Guide http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/IP_Tele/IP_Telephony_DIG.html, MAC Authentication Bypass Deployment Guide http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/MAB/MAB_Dep_Guide.html, TrustSec Phased Deployment Configuration Guide http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/Phased_Deploy/Phased_Dep_Guide.html, Local WebAuth Deployment Guide http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/WebAuth/WebAuth_Dep_Guide.html, Scenario-Based TrustSec Deployments Application Note http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/Scenario_based_AppNote/Scenario_based_AN.html, TrustSec 1.99 Deployment Note: FlexAuth Order, Priority, and Failed Authentication http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/FlexAuthNote/flexauth-note.html, TrustSec Planning and Deployment Checklist http://www.cisco.com/en/US/docs/solutions/Enterprise/Security/TrustSec_1.99/TrustSec_Checklist/trustsec-199_checklist.html, Configuring WebAuth on the Cisco Catalyst 3750 Series Switches http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst3750/software/release/12.2_55_se/configuration/guide/sw8021x.html, Configuring WebAuth on the Cisco Catalyst 4500 Series Switches http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst4500/12.2/53SG/configuration/webauth.html, Configuring WebAuth on the Cisco Catalyst 6500 Series Switches http://www.cisco.com/en/US/partner/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/webauth.html, Cisco IOS Firewall authentication proxy http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a0080094eb0.shtml, WebAuth with Cisco Wireless LAN Controllers http://www.cisco.com/en/US/partner/tech/tk722/tk809/technologies_configuration_example09186a008076f974.shtml#external-process, IEEE 802.1X Quick Reference Guide http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/whitepaper_c27-574041.pdf, IEEE 802.1X Design Guide http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/guide_c07-627531.html, IEEE 802.1X Deployment Scenarios Design Guide http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/whitepaper_C11-530469.html, IEEE 802.1X Deployment Scenarios Configuration Guide http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/W hitepaper_c11-532065.html, Basic Web Authentication Design and Configuration Guide http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/app_note_c27-577494.html, Advanced Web Authentication Design and Configuration Guide http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/app_note_c27-577490.html, Deploying IP Telephony in IEEE 802.1X Networks Design and Configuration Guide http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/config_guide_c17-605524.html, Flexible Authentication, Order, and Priority App Note http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6638/application_note_c27-573287_ps6638_Products_W hite_Paper.html. mab After existing inventories of MAC addresses have been identified, they can be exported from the existing repository and then imported into a MAB database. (Live event - Thursday, 29th, 2020 at 10:00 a.m. Pacific / 1:00 p.m. Eastern / 6:00 p.m. Paris) Reauthentication may not remove certain state whereas terminate would have. The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Configures the action to be taken when a security violation occurs on the port. If that presents a problem to your security policy, an external database is required.
For more information, see the Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental. The three scenarios for phased deployment are monitor mode, low impact mode, and high security mode. From the perspective of the switch, the authentication session begins when the switch detects link up on a port. By enabling MAB in monitor mode, you get the highest level of visibility into devices that do not support IEEE 802.1X. If the switch already knows that the RADIUS server has failed, either through periodic probes or as the result of a previous authentication attempt, a port can be deployed in a configurable VLAN (sometimes called the critical VLAN) as soon as the link comes up. The primary design consideration for MAB endpoints in high security mode is the lack of immediate network access if IEEE 802.1X is also configured. In any event, before deploying Active Directory as your MAC database, you should address several considerations. The Cisco IOS Auth Manager handles network authentication requests and enforces authorization policies regardless of authentication method. mac-auth-bypass For more information, see the documentation for your Cisco platform and the