IPv6 Configuration on Each Router Interface

To forward IPv6 traffic on a router interface, the interface must have an IPv6 address, or IPv6 must be enabled. By default, an IPv6 address is not configured on a router interface. You must enable IPv6 and configure an IPV6 address to forward IPv6 traffic on a router interface.

If you choose to configure a global or site-local IPv6 address for an interface, IPv6 is also enabled on the interface. Further, when you configure a global or site-local IPv6 address, you must decide on one of the following in the low-order 64 bits:

• A manually configured interface ID
• An automatically computed EUI-64 interface ID

If you prefer to assign a link-local IPv6 address to the interface, you must specifically enable IPv6 on the interface, which causes a link-local address to be automatically computed for the interface. If preferred, you can override the automatically configured link-local address with an address that you manually configure.

This section provides the following information:

• Configuring a global or site-local address with a manually configured or automatically computed interface ID for an interface.
• Automatically or manually configuring a link-local address for an interface.
• Configuring IPv6 anycast addresses