Now we will look at how to design an address plan for a simple campus. We will be using our campus from the fiber pricing exercise. As you can see on the screen we have six buildings with a server LAN and a core and border router. The following table shows you the host allocation for each part of that campus as you can see on the screen the border route of the core router contains two devices and so on to the wireless network which contains 350 devices the university will be using the following ip address space 2 0 0 1 colon db 8 column 8 slash 48 for its ipv6 address log you will now use this attracts blocks to design an ipv6 address plan for the campus So how we're going to do this for IPv6 we're going to repeat the same thing that we did previously for IPv4. Remember only now that the subnet size is slash 64. Temember the smallest prefix for IPv6 is a slash 64. So this is very easy. So as you can see on the screen we're going to show you the same table that we showed you previously with the number of devices water to core router you have two devices remember you're allowed to use point-to-point links in ipv6 everything else gets a slash 64. you can see that the server network which has 23 devices all the way to the wireless network which has 350 devices all get a slash 64. remember that the campus gets a slash 48 prefix so we're not going to think like ipv4 when we design our plan now remember that the prefix allocated was 2 0 0 1 column db 8 column eight column we're going to use xx yy double colon slash 48 as the template for assigning ib addresses xx can be used to count functions this gives us a total of 256 56 in the campus and we're going to use yy to be used to count subnets within that function this gives us another total of 256 64 in that function each function might be a faculty or a building or core infrastructure so we're going to do this by allocating what slash 56 for campus network infrastructure this gives us 256 possible slash 64s for campus network infrastructure we'll be using one slash 64 for the point-to-point link we'll use another slash 64 for the servers we're going to also going to be using one slash 56 for each building this gives us 256 possible slash 64s within each building but we only have one land per building in this example so we have plenty of room to add more in future and now let's assign the address blocks accordingly remember that we said we're going to reserve with slash 64 for compass network infrastructure this would mean the border rather the core router and the server network so the first x remember the template we're using x x y y so the first one we're going to be assigning is for the border core router which will assign the prefix 2 0 0 1 column db 8 colon 8 colon 0 0 0 zero double cone slash 64. this is going to be the point to point link the product called router and then we'll assign the prefix to zero zero one comma db eight column eight column zero zero one zero double column slash 64 for the server network remember that the border router to core router and your server network are within the same slash 56 prefix we're going to assign the next one to the science building remember we said each of the buildings get a slash 56 so in this case we're going to use the prefix 2001 column db8 column h column 0 1 0 0 double quotes 64. the science building we're going to use the next one for the arts building which is 2 0 0 1 column db eight column eight column zero two zero zero double clone slash sixty four we're going to use the next one for the arts building which is two zero zero one one db eight column eight column zero two zero zero double clones 64. and so on all the way to the wireless network which is going to be assigned two zero zero one column db eight column 8 column 0 8 0 0 double column slash 64. We see that when we're using IPv6 address plan it's way easier we're using the nibbles in the IPv6 address to indicate the function remember nipple is 4 bits so each character in the IPv6 address represents 4 bits so you might do this like we did for example you might do this for two zero zero one column db eight column eight column x y double z double colon slash 48 where x will be the faculty this will give you a total of 15 faculties and you can use y for the department which will also give you 16 departments for faculty and you can use double z for the LAN which will give you 256 per department. In this case x equals 0 is for the campus backbone infrastructure. There are many other variations on this theme that you can use but the use of the nimble to indicate function makes it easier for address planning.
© Produced by Philip Smith and the Network Startup Resource Center, through the University of Oregon.
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