hi this is a very interesting topic
On 9-aug-2005, at 19:24, Cody Lerum wrote:
Here is our current plan, but we are looking for suggestions from people who have been down this road before. The plan is to break out a /48 for our organization. Then break out the first /64 for loopbacks, and the next /64 for point-to-point connections. The PTP /64 then breaks out further into 1 /80 for core links, and 1 /80 for each of our distribution sites. Within these /80's are individual /112's for PTP links. What this will allow us to do is aggregate each sites PTP connections into /80's within our IGP.
Hm, I would keep the first /48 apart for your own services. Addresses in that first /64 are nice and short.
agree. i would keep the first "several" /48s though, in case your network grows. what we do is we don't use anything greater than a /64. (excluding loopbacks) main reason is because it becomes too much of a hassle to keep track of any prefixs greater than that. the first few /48 blocks are reserved for own services and networks and data centers. within these /48s we divide them into /56s and define what they mean example: 2001:db8:a::/48 data center "a" 2001:db8:a::/56 routers, ptp links etc 2001:db8:a:0100::/56 ntp's dns's, etc. 2001:db8:a:0200::/56 hosted streaming servers 2001:db8:a:0300::/56 hosted web servers and so on we did this because its easier to notice problems this way. when an alarm is detected on our NMS at 2001:db8:a:0200::/56 we know right away that there is a problem at the streaming zone. our main business is being an ISP for consumers, so this might differ if you mainly serve corporate customers.
If you use /64s for router links, you can use eui-64 addressing within those, which has the advantage that you don't have to keep track of which router has the ...1 and which router has the ...2 address. If you use a lot of vlans in your own network (as opposed to customer links) you may also want to endcode the vlan id in bits 48 - 63. Makes everything really simple to debug!
i think this is the most important thing in deploying IPv6 networks. make it simple to debug, and that will make life a whole lot easier. --- seiichi