We decided for a slow-start behaviour when introducing IPv6 into the production network. So in the beginning IPv6 will not be activated on every core router but only the most important ones, namely the transit routers. As some of the routers are only virtual and the virtual technology is quite new in the University’s network, we will try to refrain from using these routes.

Still, we want to offer IPv6 in every VLAN that wants to use it. Which VLAN is allowed to receive IPv6 traffic is limited by the level of security that is active in that VLAN. As high security areas are secured with special (IPv4)hardware we cannot achieve the same level for IPv6 with current means.

In summary, in some VLANs the IPv4 router will not physically be the same as the IPv6 router. So the IPv4 network will differ from the IPv6 network, the NOC has to handle two different networks and we cannot achieve a full dual-stack mode from day one.