Symptom
The minimum value for BFD timer on IPN facing interface is 250ms.
When value less than 250 ms is configured, BFD timer value is always 250ms.
Conditions
ACI-OS version is 15.2(5c) or later.
Further Problem Description
The default timer value and minimum timer value for bidirectional forwarding detection (BFD) over IS-IS has been changed to 250ms.
However, there is no description about IPN facing interfaces on the document.
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Cisco Nexus 9000 ACI-Mode Switches Release Notes, Release 15.2(5)
Changes in Behavior
https://www.cisco.com/c/en/us/td/docs/dcn/aci/apic/5x/release-notes/cisco-aci-nx-os-release-notes-1525.html#ChangesinBehavior
The default timer value and minimum timer value for bidirectional forwarding detection (BFD) over IS-IS are both now 250ms.
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