On Wed, Jan 14, 2009 at 09:05, Frank Bulk <frnkblk@iname.com> wrote:
For the first time we have our own ARIN-assigned netblocks that we can now split out and divide to our customers.
What's the best approach to handing out /30's, /29's, etc. that is efficient as possible but allows for customers to expand their allocation to a neighboring block?
We pay much more attn to efficient utilization and advertisement aggregation than to ensuring that customers have contiguous blocks. For example, we internally assign a /24 to a given PE router and then assign from it straight through; 0/30, 4/30, 8/29, etc. as customers get turned up or request more space. Then when it's used up, we add another... Although it is neat and tidy to have contiguous blocks everywhere, the cost to benefit doesn't seem to be there so we focus on aggregation at transition points such as edge to backbone, backbone to peers, etc. ~Chris
I was thinking of having one /24 for each block size, and then do the divide and conquer approach by allocating the first /30, for example, as 0 and 128, then next two at 64 and 192, etc. Once there's only one /30 free between each allocation, I would start using another /24. Of course, that would mean 50% (or less) utilization.
Ideas?
Frank
-- Chris Grundemann www.chrisgrundemann.com