Worked Example – ISP Address Plan in an IPAMs

[Olayemi Amao]

Can we get a subnet above /24 from RIR, like /20, /16, /12 based on estimation from our design from customer level up to the City level?

[Zeinab Mohamed]

🚧Question on Hierarchical Asymmetry – Worked Example 🚧

Case Overview:

I am working through an IPv6 addressing plan for an organization with the following structure:

Level 1 (Regional): 25 Cities. Borrowing 8 bits to accommodate this (2^8 = 256 max), resulting in a /36 per city.

Level 2 (Local): 7 Campuses per city. Borrowing 4 bits (2^4 = 16 max), resulting in a /40 per campus.

End Level: 5 Departments per campus, supporting ~5,000 devices using /64 subnets.

Network Prefix from AFRINIC = /32
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The Crucial Question:

In this architecture, Level 1 uses a larger “bit-slice” (x=8) than Level 2 (y=4). Is it a best practice for a higher level in the hierarchy to have a smaller “bits borrowed” value than a lower level, or should the bit-allocation ideally follow a descending or equal pattern?

Does having a larger bit-allocation at the top level (Cities) create unnecessary sparse density, or is it preferred to allow for more significant regional growth compared to local campus growth?

Another Question about End Level, I initially choose /60 to fit the requirement then I thought /64 will be a bit better and more align with the recommended guideline we have during the course? Can you confirm this point too?

Looking forward for your replies Fellows

[Vincent Onyango]

well explained

[Kumbirai Andrew Mawisire]

srs help please

[Kumbirai Andrew Mawisire]

please help with that question [lease