[nsp] ipv6 resources ?

[Stephen J. Wilcox]

I've not seen any docs but I'd imagine any such carving up depends on your 
requirements. Heres my take..

IPv6 is usually allocated in /32 blocks to providers, and each customer is 
supposed to be assigned a /48 regardless of their requirement (whether they need 
10 or 10000 addresses). This gives you 16 bits to play with as an ISP.

16 bits = 65536 /48 customers.

My own way of doing this is to allocate blocks to each POP and assign
infrastructure and customers from that. A /48 per POP should be enough to
accomodate all the internal infrastrure - LANs, P2Ps, loopbacks etc. So you just
need to decide how many assignments per pop you need ie whether you choose to
split the above into 256 * 256 /48s or 16 * 4096 /48s etc.. and thats going to
depend on you.. if you make the blocks small enough you can always assign more
than one per pop for efficiency. My goal in this was to ensure there is enough
capability for aggregation to not have 65536+ routes in the IGP and yet not have
large amounts of space unassigned in smaller pops and ever be in a situation
where we need more space but have too much unassigned.

Realising you have 16 bits to play with is probably the first thing you have to 
do, and then realising that each customer will only get 1 of the /48s and you 
dont need to be thinking in terms of individual IPs (as per v4) but only of /48 
blocks - if that makes sense.

Steve

On Thu, 8 Jul 2004, matthew zeier wrote:

> 
> I'm looking for a good resource on ipv6, specifically something that covers
> subnetting and "how to best carve up a /32 or /48 for downstream customer
> use".
> 
> My mind still works in v4 so anything that can help me better understand
> this would be great.
> 
> 
> 
> --
> matthew zeier, Sr. Network Engineer  | "Nothing in life is to be feared.
> InteleNet Communications, Inc.       |  It is only to be understood."
> (949) 784-7904                       |       - Marie Curie
> 
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