BGP ILLEGAL MESSAGE DETECTION METHOD AND APPARATUS

PROBLEM TO BE SOLVED: To provide a BGP illegal message detection method and apparatus in which an illegal message of BGP and illegal AS can be detected easily.SOLUTION: A BGP illegal message detection apparatus includes a message extraction section 101 which extracts an Announce message of BGP, a fluctuation detection section 102 which detects attribute fluctuation announced by the message, a sorting section 103a which sorts attribute fluctuation detected messages for each attribute fluctuation, a shared AS detection section 103b which detects a shared AS that a plurality of messages pass through together, and an illegal message notification section 103c which outputs an illegal message notice including identification information of the detected shared AS.