[AfriNIC-rpd] Anycast prefix's

[Andrew Alston]

Hi All,

 

Before I actually type up and submit a policy proposal, I wanted some
opinions on the adoption of a policy regarding the allocation of /24
prefix's for the purpose of anycast.

 

This could be done in two ways, either through a modification of the
current v4 allocation policy or through the addition of an overriding
policy, I think the former makes more sense however.

 

Very basic concept:

 

Because you cannot announce anything smaller than a /24 into the global
tables, in order to provide for anycast you need to announce an entire
/24, and in an anycast situation this is announced from multiple asn's.
AfriNIC's current v4 policy states that the minimum allocation size on
initial is a /22.  To use a /22 for anycast when you potentially are
only using 3 addresses in the block is a huge waste.

 

Also, with anycast prefix's it is potentially possible to have multiple
anycast blocks that are using only 2 or 3 addresses in the prefix (see
ASN 112 192.175.48.0/24 prefix that uses 3 address in the /24).  This
means that a company that utilizes general allocation /24 space for the
purposes of anycast could be in trouble when applying for more space due
to lack of space usage.

 

To my knowledge RIPE also has a policy that allows for this kind of
allocation.  

 

If people think this is viable, I'll type up a proposed policy or a
proposed modification and send it through, just trying to get a sense of
what the feeling is.  If anyone wants more details on anycast before
commenting on the policy, feel free to drop me an email as well.

 

Thanks

 

Andrew Alston 

TENET - Chief Technology Officer

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