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FCSP DH-CHAP provides absolute protection against WWN spoofing on a compromised port , even when physical security of the switch has been compromised and a rogue device has been installed on the same physical switch port as that of the rightful host . Normally a link that moves between an UP and DOWN state will cause the Layer 3 routing protocol to re-converge resulting in potential packet drops . Business is a delightful mindset that makes one person 's difficulties another 's opportunity . The mindset and techniques spread throughout the automotive and software industries during the late 1980s and early 1990s . Significant attrition problems in critical account and product management roles have left customers to fend for themselves against a failing software development operation that has no embedded recruiting expertise . Note : The community string used at the time of switch discovery is later used by ECC to do any write operations .