IPv6Freelys IPv6 Addressing Scheme

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Contents 1 Overview 1.1 Global Routing Prefix 2 General Scheme 2.1 Router Loopback Addresses 2.2 Point-to-Point Addresses 2.3 Campus General Subnets 3 Current Allocation 3.1 Point-to-Point 3.2 Temporary Subnets

[edit] Overview

This document describes the preliminary IPv6 addressing plan for Pittsburg State Universities campus data network.

[edit] Global Routing Prefix

PSU's IPv6 address block is 2001:49D0:180::/42, which is allocated by KanREN. This is subsequently sub-netted into 64 (2^6) /48 sized subnets.

In PSU's case, the structure of an IPv6 address looks like the following (see RFC 3513):

   |         n bits (42)     |m bits (22)|       128-n-m bits (64)    |
   +-------------------------+-----------+----------------------------+
   | global routing prefix   | subnet ID |       interface ID         |
   +-------------------------+-----------+----------------------------+

where the global routing prefix is 2001:49D0:180::

[edit] General Scheme

The /42 allocated to PSU is split into 64 /48s. The first /48 (0180) is split into /64s, with the first /64 reserved (0000) for point-to-point links and loopback addresses:

2001:49d0:0180:0000:0000:0000:0000:0000/64

[edit] Router Loopback Addresses

Router loopback addresses are /128 bit host routes allocated from the prefix 2001:49D0:0180:0000:0000:0000:0000:0000/112

Each router loopback address is indicated by its Router # (y):

2001:49D0:0180:0000:0000:0000:0000:0001/128
2001:49D0:0180:0000:0000:0000:0000:0002/128
...
2001:49D0:0180:0000:0000:0000:0000:FFFE/128
2001:49D0:0180:0000:0000:0000:0000:FFFF/128

For example, lo0 on Router 15 would be: 2001:49D0:180::15/128

[edit] Point-to-Point Addresses

Certain specialized subnets do not need to consume so much space, such as point to point links between routers, router only broadcast networks in the core. These networks typically comprise only router interfaces which do not use EUI-64 style auto-configuration. For such networks, smaller subnet allocations of size /112 will be made from the first /64 prefix.

Excluding the /112 allocation already reserved for router loopbacks, these are exmamples of possible Point to Point subnets:

2001:49D0:0180:0000:0000:0000:0001:0000/112
2001:49D0:0180:0000:0000:0000:0002:0000/112
...
2001:49D0:0180:0000:0000:0000:FFFE:0000/112
2001:49D0:0180:0000:0000:0000:FFFF:0000/112

[edit] Campus General Subnets

General campus subnets use the following:

   |         n bits (48)     | b(8) | s(8) |       128-b-s bits (64)    |
   +-------------------------+-------------+----------------------------+
   | global routing prefix   | bldg | srvc |       interface ID         |
   +-------------------------+-------------+----------------------------+

Building addresses are summarized as: 2001:49D0:0180:bb00:0000:0000:0000:0000/56

Service addresses are: 2001:49D0:0180:bbss:0000:0000:0000:0000/64

Therefore, Building 13, Service 10 (Faculty Staff) would be: 2001:49D0:180:1310::/64

[edit] Current Allocation

[edit] Point-to-Point

2001:49D0:180:0000:0000:0000:0001:0001/112 - rtr-kelce-edge (Gi0/2)
2001:49D0:180:0000:0000:0000:0001:0002/112 - asa-kelce-1 (Gi1/1)

2001:49D0:180:0000:0000:0000:0002:0001/112 - asa-kelce-1 (Gi1/0)
2001:49D0:180:0000:0000:0000:0002:0002/112 - sw-kelce-core (vlan 901)

[edit] Temporary Subnets

These subnets are in use temporarily until new VLANs and 10.0.0.0/8 addressing is complete.

2001:49D0:180:AAAA::/64 - Vlan 1
2001:49D0:180:BBBB::/64 - Vlan 133
2001:49D0:180:FFFF::/64 - Vlan 131