We will see in detail how the 4 bytes (32 bits) autonomous system numbers work, how this new numbering interact with systems that only support 2 bytes ASN and the operation of new capabilities, attributes, etc.

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Initially, the AS number field was only 2 bytes (0-65535). Using a 'capability', it's extended to 4 bytes (4.294.967.296).

Backwards compatibility is available for systems that only support 2 Bytes AS numbers. For 4 Bytes AS numbers, new attributes (Optional Transitive) are in use: AS4_PATH y AS4_AGGREGATOR and a reserved AS (23456).

The AS numbers starting from 64512 to 65535 are reserved for private use.



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