32-Bit AS-Numbers in German HAMNET

IP-Koordination Germany assigns as-numbers and ip-networks under the following policies:

• POLICY: Every autonomous system (AS) must include several locations (Sites)¹⁾.
• POLICY: Every autonomous system (parent-AS) has been assigned a 16-bit-AS-number.
• POLICY: Every parent-AS has been assigned a block of 100 32-bit as-numbers derived from the last 3 digits of the 16-bit as-number.
• POLICY: Every parent-AS has been assigned different ip-subnetworks for backbone and user/services.
• POLICY: Every site within the parent-AS gets a 32-bit as-number out of the parent-AS pool.
• POLICY: There has to be „site-to-site eBGP routing“ within the parent-AS.

According to the X.121 Dokument of ITU, Germany has got the four county-codes 262 to 265. According to the proposal for assigning private 32-bit-as-numbers in AMPRNet^tm, Germany has four blocks of as-number-range, with 100000 32-bit-as-numbers each(status: 01.01.2020).

This is a huge amount of numbers! At the moment in German HAMNET only the first 32-bit-as-block has been used. IP-Coordination Germany assigns 32-bit-numbers in blocks with 100 each (see digits yy=0-99) to the existing parent-AS. Assignment of digits XXX follows a principle called „as-based numbers“.

In this variant the last 3 digits of the 16-bit parent-as-number are placed into the first of the five available digits of the new 32-bit as-block. The last 2 digits of the new 32-bit as-number are freely available for usage at sites within the parent-as. The as-maintainers are free to decide how the 32-bit-numbers are used at the local sites within their parent-as.

AS64625    the last 3 digits are 625
possible 32-bit-AS-range within AS64625:
42 262 625 yy --> from 4226262500 to 4226262599 

advantages:

• no central registry neded for 32-bit as-numbers
• maintainer of parent-as can use them immediately
• no doubles possible in other parent-as
• affiliation to the right 16-bit parent-as is human readable
• no effort in administration when ip-networks are transferred
• AS-numbers remain at their location when ip-networks must be transferred
• mapable to the structure of HamnetDB without any problems

disadvantages:

• „only“ 100 32-bit-as-numbers available for each 16-bit parent-as
• ???

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