Dead with ISE server access

Hello
I´d would like to know how to give access to users when ISE is dead.
I m requesting because I m using pre authentication ACL, so even with the order of authentication server dead action events allow vlan XX access will be limited, will it not?

My pre authentication ACLs allow access only to ISE, DNS and DHCP requests.

Kind regards.

André-

I'm afraid that you don't have a lot of options here. I have encountered this problem before during my deployments. The problem is that the ISE is necessary in order to signal the switch to remove the pre authorization ACL using a DACL. However, since ISE is not available, the switch can allow endpoints to a VLAN, but not you need another method to remove the ACL of pre approval. In the past, I've accomplished this via one of the following:

1 script EEM that reconfigures the switch and sets the pre authorize "license ip any any" ACL (or remove the ACL of pre approval all together) when / if the ISE servers become unavailable. I thought that this required functionality of the IP Services, but by looking at the following doc looks like you could do with IP Base too. I guess you can give it a try and see what happens :)

http://www.Cisco.com/c/en/us/products/collateral/iOS-NX-OS-software/IOS-software-releases-12-2-special-early-deployments/product_bulletin_c25-614546.html

example of script EEM:

http://www.alcatron.NET/Cisco%20Live%202013%20Melbourne/Cisco%20Live%20Content/security/BRKSEC-3040%20%20Advanced%20ISE%20and%20Secure%20Access%20Deployment.PDF

2. the second method requires a switch to converged access (3850, 3650). These switches can be configured with the profiles where the pre authorization ACL can be replaced by an ACL critical interruption of the ISE.

I hope this helps!

Thank you for evaluating useful messages!

Tags: Cisco Security

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