The ExtremeXOS software supports 4-byte AS numbers, which can be entered and displayed in the ASPLAIN and ASDOT formats, which are described in RFC 5396, Textual Representation of Autonomous System (AS) Numbers.
Note
When entering an AS number in a policy file, you must enter a unique 2-byte or 4-byte AS number. The transition AS number, AS 23456, is not supported in policy files.