Restrict deletion of interface operations on all SDX devices

Deletion of an interface or an LA channel after the VPX has been created on an SDX may cause renumbering of the interfaces after a reboot. The renumbering may cause the SVM to not be able to contact that VPX instance and the SVM will display the instance in Down state.

Affected Versions and Builds: 13.0 build 71.x and later or release 12.1 build 60.x and later.

Example of a Deletion operation: An ADC being provisioned with LA/1 and LA/2 channels each comprising of 10/1, 10/2 and 10/3, 10/4 virtual interfaces respectively. When the User goes to unbind and edit the Citrix ADC to remove to LA/1 channel, this will cause a reboot. (the edit of the ADC config happens after it reboots, while it is rebooting it still has the old config, but the underlying interfaces have shifted numbering). After boot up the LA/1 is removed but LA/2 VFs (virtual interface on VPX) which originally had 10/3 and 10/4 have shifted to 10/1 and 10/2.

Impact: The SVM can now no longer reach the VPX and the instance state will be reported as Down. Customers cannot go and renumber the instance themselves.


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