Implementing Cisco IP Switched Networks (SWITCH v2.0) :: 300-115 Real Exam Questions | Pass4sure Braindumps | VCE Practice Test

Cisco Implementing IP Switched Networks (SWITCH v2.0)

Implementing Cisco IP Switched Networks (SWITCH v2.0)
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MAB with Non-Cisco Switches

i am sure Cisco would love to be the handiest community machine that its consumer have, and to be sincere, there are many agencies the place that is right. however, it just isn't the truth of a hundred% of agencies that install Cisco ISE or ACS.

One merchandise in selected that i am requested about generally is MAC Authentication pass (MAB).  here's the method of a non-authenticating gadget (a tool devoid of an 802.1X supplicant operating on it) connecting to a network with 802.1X enabled.  considering there is no supplicant to answer the EAP id requests from the authenticator (switch, wireless controller, and so on) the authenticator will generate the authentication request FOR the endpoint using the endpoint's MAC handle because the username/password for the access-Request message.

background on MAB

Take a glance at figure-1.  This photo is showing a printer w/ a mac handle of which is connected to a switch that has 802.1X enabled on its ports and sends the authentication requests to a RADIUS server.

MAB ExampleAaron Woland

figure-1: MAB example

In figure-1, the printer did not have a supplicant, and hence is unable to participate within the 802.1X identification alternate.  therefore the switch sends a RADIUS access-Request to the RADIUS server, which determines if the machine is allowed on the network.  Assuming it is allowed on the community, the server sends a RADIUS entry-accept message to the switch, allowing the printer to participate on the network.

it's important to notice that while 802.1X is a common, MAB isn't. MAB is whatever that each vendor could implement in another way in the event that they so select, simply provided that the RADIUS verbal exchange complies with the regular for RADIUS.

How does a change (authenticator) comprehend when the endpoint that is plugged into it doesn't have a supplicant? Following the 802.1X usual, the formulation is with ease a timeout. The authenticator is intended to send EAP over LAN id request frames each 30 seconds by means of default. After three timeouts (a period of ninety seconds through default) it is assumed that the endpoint must now not have a supplicant. As with most Cisco change points, timers are adjustable. determine-2 shows the timeouts taking place thrice earlier than MAB begins.

802.1X TimeoutsAaron Woland

figure-2:  802.1X Timeouts

take into account that MAB is inherently no longer a comfy know-how. When implementing MAB you're bypassing the enhanced safety of 802.1X through allowing certain MAC addresses to profit access without authentication. When the usage of MAB, always follow a defense-in-depth method. This means a tool that has been licensed to use the network from a MAB request should be granted access to the networks and features that machine is required to speak to simplest.

In other phrases: don’t give full access to gadgets which have been MAB’d, in its place offered them with an authorization that is extra constrained. considering the fact that MAB is a typical RADIUS authentication and the authorization determination is being sent from the authentication server (ISE), there really aren't any obstacles to the classification of authorization consequences that can be despatched to the authenticator.

Examples are:

  • Downloadable ACLs (dACLs)
  • Dynamic VLAN project (dVLAN)
  • URL-redirection
  • protection community Tag (SGT)
  • sensible port macros
  • Many greater
  • keep in mind that if an endpoint does not have a supplicant, it isn't counseled to trade its VLAN. When changing a VLAN assigned to an endpoint, that endpoint should know (by some means) to renew its IP tackle. The premiere answer is to not use VLAN changes on open networks, as a result of there is nothing on the client to detect the VLAN alternate & trigger the DHCP renewal. When the network makes use of 802.1X, there is a supplicant on the endpoint to do the VLAN exchange detection (is gateway reachable, etc.) & trigger the DHCP renewal.

    in case you still decide to change the VLAN on open networks, then you definately have simplest a couple of decisions (none are considered a most desirable-follow). you could set the DHCP lease time to some thing VERY low, so it is going to renew the handle frequently. there is additionally an option to use an ActiveX or Java Applet on the portal on the way to do the VLAN change detection in lieu of a supplicant.

    Cisco and non-Cisco MAB

    As mentioned in the past: there isn't any ordinary for MAB. diverse carriers will put in force MAB in alternative ways, using diverse RADIUS values.  there is a key RADIUS attribute it truly is used to determine what category of authentication request is being despatched:  provider-classification.  Some normal values for service-type with Cisco network entry instruments are listed right here:

  • carrier-class=Framed (indicators an 802.1X authentication)
  • service-type=Login (signals WebAuth)
  • carrier-class=call-verify (indicators MAB)
  • on the grounds that MAB isn't a typical, some providers will ship a RADIUS service-classification of “Login” with MAB, some will send a RADIUS provider-category of “framed”.  So, why would Cisco use service-type of "name-investigate" if no other seller does? Why does Cisco operate MAB in a different way than every person else? short reply: safety.

    a long time ago, earlier than Cisco launched Cisco ISE or the Cisco ACS 5.x server, there became a probable security vulnerability with MAB. That security vulnerability remains feasible with other options and other network instruments. The issue changed into/is the shortcoming of differentiation between a MAC Authentication pass request and a native internet Authentication request. both requests will come from the community machine with the identical carrier-type and the same layout. There turned into no database separation of consumer-id’s from endpoint-identification’s (mac-addresses). As displayed in figure-3, a malicious consumer could enter a mac-handle into the username and password fields of a web authentication or possibly even into the endpoint supplicant, and benefit access to the network.

    Security Issue without Call-CheckAaron Woland

    determine-3:  protection problem with out call-verify

    so as to shut this protection hole, and make MAB a little bit more relaxed, Cisco modified the way it does MAB. the important thing adjustments are listed here:

  • For authentication requests to be processed as MAB (by default), carrier-type ought to be call-investigate
  • RADIUS Servers (ACS & ISE) hold a separate Endpoint Database
  • The calling-station-identity is the price that should be compared to the Endpoint Database, ignoring the username and password fields of the MAB request
  • figure-four illustrates the thought of a Cisco compliant MAB.  A packet capture is listed on the left aspect to spotlight the fields of importance.

    Cisco MABAaron Woland

    figure-four: Cisco MAB

    All supported Cisco network access gadgets will use a service-type of “name-assess” for MAB requests. they will also make certain the calling-station-identity is populated with the mac-handle of endpoint. lastly, Cisco ISE uses a simple assess-container within the allowed-protocols configuration as one other components to let or deny the entry into the endpoint database for the MAB request, as viewed in figure-5.

    Allowing Non-Cisco MABAaron Woland

    figure-5: allowing Non-Cisco MAB

    Configuring Cisco ISE for 3rd birthday celebration MAB

    while Cisco ISE makes it possible for for the acceptance of non-Cisco MAB, it is not usually some thing make sure to or would are looking to do for all incoming requests, best the place fully vital.  i like to recommend that you separate this out through the use of a different policy set for non-Cisco switches. I always do that through creating a network equipment community (NDG) for all NADs that are non-Cisco, as considered in determine-6.

    NDG's for Non-CiscoAaron Woland

    determine-6: NDG's for Non-Cisco

    after you have your NDG's setup and the non-Cisco NADs added to those NDG's; that you would be able to then construct the new policy set.  determine-7 suggests the policy set, and the rule of thumb that matches the coverage set, which is translated as: "if NDG begins-with ThirdParty then use the ThirdParty coverage set".

    ThirdParty Policy SetAaron Woland

    figure-7: ThirdParty policy Set

    every network equipment may have distinct capabilities with sending usernames/passwords and even filling in the calling-station-identification container with the MAC handle of the endpoint.  In my own tests I actually have discovered the following:

  • Juniper EX swap:  depart both Calling-Station-identification and Password alternate options checked.
  • HP (H3C) change:  Uncheck Calling-Station-identity.  leave Password alternative checked.
  • RuggedCom change:  Uncheck Calling-Station-identification.  leave Password choice checked.
  • Avaya (Nortel) switch:  Uncheck each Calling-Station-id and Password options.
  • Alcatel change:  Uncheck each Calling-Station-id and Password alternate options.
  • next, you are going to need to have an "Allowed Protocols" set it truly is configured for the third celebration product you are the use of.  You could need to create one for each and every supplier, which often is the most explicit and secure method to configure the alternatives. determine-8 indicates an example third celebration Allowed Protocol set that could work for Juniper EX switches (in my checking out

    Example Allowed Protocols setAaron Woland

    determine-8: illustration Allowed Protocols set

    after you have created the entire "Allowed Protocol" sets that you simply need, you're going to then create the authentication rule(s) for each and every one.  figure-9 illustrates an authentication rule that could work for each Nortel and Alcatel switches, in line with my trying out.

    Nortel & Alcatel AuthC RulesAaron Woland

    determine-9: Nortel & Alcatel AuthC rules

    determine-10 illustrates an authentication rule that would work for Juniper EX Switches, in line with my trying out outcomes.  It also includes the new default rule on the bottom of the ThirdParty policy set that deny's all non-matching traffic.

    Juniper EX Switch AuthC RulesAaron Woland

    determine-10: Juniper EX switch AuthC suggestions

    well that about covers MAB with 3rd celebration contraptions.  i'm hoping you discovered this weblog put up advantageous!  As always, I appear forward to analyzing & responding to any comments you may additionally have. 

    See you subsequent time.

    this text is published as part of the IDG Contributor community. wish to be part of?

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