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Port bounce only when Role changes

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  • 1.  Port bounce only when Role changes

    Posted 2 days ago

    Hello,

    We have the following scenario.

    1) all non authenticated device we are providing vlan "parking" with CPPM (default role) with limited access applied on the VLAN FW. On this vlan we have rules to allow only traffic to permit the devices to be compliant to be authenticated after. For example download the Cert, etc.

    2) Every 60 min defined by the "parking" role the sw is doing the reauth to check if the device is now "compliant"

    3) if the device is compliant it will now provide the correct role / vlan.

    The issue is when cppm provides the new vlan the device will mantain the IP from the old vlan. The solution seems to port bounce on the Enforcement profile.

    The only issue is we are doing a reauth via profile every day on compliant devices and we don´t want to port bounce in this case.

    Is there any solution to port bounce only if the vlan/role changes?



  • 2.  RE: Port bounce only when Role changes

    EMPLOYEE
    Posted 2 days ago

    Only option I can only think of off-hand is to tag the endpoint with last known state and only bounce when the state changes, similar to a grace period for OnGuard.

    Better option would be to utilize an ACL or firewall/role integration so that a port bounce isn't necessary as the IP address wouldn't change.



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    Carson Hulcher, ACEX#110
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  • 3.  RE: Port bounce only when Role changes

    Posted 2 days ago

    Hello

    Thank you for your answer. Can you provide more details about the this tag?

    Regarding the better option, we don´t want to start implementing ACL on the SW, we cannot use DUR and for that it will became a mess to deal with all the rules on the SW. Regarding the integration we will do that in future with Palo Alto but some devices we don´t have a way to provide the vlan without any information. On that case the CN of the cert. So if the device is not compliant we cannot distinguist the vlan. It could work for our CAM vlan , printers vlans using profilling, 




  • 4.  RE: Port bounce only when Role changes

    EMPLOYEE
    Posted 2 days ago

    The best answer for this is to use OnGuard and profiling, that way you can utilize a posture check for the computers and implement profiling for everything else.

    For a tag you'd add an attribute to the endpoint entry.



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    Carson Hulcher, ACEX#110
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  • 5.  RE: Port bounce only when Role changes

    Posted 2 days ago

    unfortunately we donºt have OnGuard license :( 

    For tagging you mean everytime I authenticate a device cppm will update the atribute with the role, And on the roles I compare if the role is the same. Good point :)
    But now the question? How can I update the tag after the authentication? 




  • 6.  RE: Port bounce only when Role changes

    EMPLOYEE
    Posted 2 days ago

    If you don't have OnGuard, next best option is to make use of user roles on Aruba switches.

    Create and use an endpoint update enforcement policy to set an attribute value.  This is the same thing that a guest setup does when tagging the endpoint with the MAC auth cache expiry value.



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    Carson Hulcher, ACEX#110
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  • 7.  RE: Port bounce only when Role changes

    Posted 4 hours ago

    What Carson is reffering is:

    1. Create an attribute under Administration / Dictionaries / Dictionary Attributes like that:



    2. Under Configuration / Enforcement / Profiles define two enforcement profiles. One to set the value of attribute to True and one to set it to False.



    3. When new device is detected, without this attribute, you can set it in Enforcement policy. Use your specific conditions to detect new devices.

    4. Then you can use this attribute in Role Mapping to set appropriate Role and use this role (or attribute directly) in Enforcement Policy to mark the new device as "Unknown Device" and if value is true bounce the port and set value to false. Don't forget to check your other required conditions before you set this attribute to False.

    Best, Gorazd



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    Gorazd Kikelj
    MVP Guru 2024
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