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GNS-3 Lab: 4-byte Autonomous System Number - interactions between 32 and 16 bit speaking BGP routers - Pierky's Blog
Such as IPv4 addresses, 2-byte pool of Autonomous System (AS) Numbers is going to be exhausted soon. By the time I’m writing, it seems Internet will run out of 16-bit AS Number on 26-Sep-2012. To prevent this situation, IANA extended the AS Number field to 32 bits and, on 2007, RIRs started assigning them… or, …