revalidate previously profiled endpoints of ISE

Hello

I had a peek at MAC spoofing with ISE 2.1.0.474

I use RADIUS/SNMP trap and queries and probes DHCP. A Cisco 7911 phone correctly is profiled as "Cisco-IP-Phone-7911. Endpoint in ISE shows all the correct details of cdp/lldp/dhcp

When I connect my windows laptop (MAC spoofing phones), the laptop computer is authenticated as the phone. Endpoint is always profiled as "Cisco-IP-Phone-7911" - endpoint shows details of correct dhcp for the laptop but retains the cdp/lldp profile phone details previously. I checked the n and cache device sensor has no cdp/lldp details for the laptop connected and accounting device sensor sends only mobile dhcp from tlv to ISE.

If I delete the end point of the ISE and connect my laptop (even once, spoofing phones MAC), ISE profiles properly the laptop as "Microsoft-workstation.

When I disconnect the laptop and reconnect the phone, ISE re-profiles the end as a "Cisco-IP-Phone-7911" based on newly learned information from cdp/lldp point.

ISE can learn new details of endpoint by the probes and reporter endpoint as shown above. I reason to say that ISE postpone endpoint based on the fact that some attributes (for example cdp/lldp) kept from appearing - when new attributes are learned?

Thank you
Andy

Hello Andy,

What you are experiencing is correct and should the behavior with the current mechanisms of ISE. There is an enhancement request that was put in place some time, but he has not seen much traction:

https://BST.cloudapps.Cisco.com/bugsearch/bug/CSCur48184

The only time wherever a device would move one profile to another group is when a profiling rule with certainty factor higher is reached. For example, if you create a custom CF rule of 100 and this rule is struck then a device profile will never move to another rule which has CF which is<= to="">

As you can tell, profiling is not the test. This is why it is recommended to restrict access to the network for targeted devices. For example, IP phones should just join the subnets of the voice and the PBX, printers should only need to access the print servers on specific ports, etc.

I hope this helps!

Thank you for evaluating useful messages!

Tags: Cisco Security

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