Cisco Cisco IOS Software Release 12.2(54)SE

You should review this section before you begin working with the switch. These are known limitations 
that will not be fixed, and there is not always a workaround. Some features might not work as 
documented, and some features could be affected by recent changes to the switch hardware or software.

If you create a BFD session between two switches and then create an ACL that includes the permit 
ip any any log-input access-list configuration command, when you attach the ACL to one of the 
connecting interfaces, the BFD session goes down. If you remove the ACL from the interface, BFD 
comes back up.

The workaround is to not use a permit ACL entry with the log option on interfaces participating in 
BFD. (CSCtf31731)

A static IP address might be removed when the previously acquired DHCP IP address lease expires. 

This problem occurs under these conditions:

When the switch is booted without a configuration (no config.text file in flash memory).