IPv6 Prefixes

To define prefixes to be advertised on the interfaces of the device, follow these steps:

Procedure

Step 1

Click IPv6 Configuration > IPv6 Router Configuration > IPv6 Prefixes.

Step 2

If required, enable the Filter field and click Go. The group of interfaces matching the filter are displayed.

Step 3

To add an interface, click Add.or if you like to edit an interface, select the interface and click Edit.

Step 4

Select the required IPv6 Interface on which a prefix is to be added.

Step 5

Enter the following fields:

OptionDescription
Prefix Address The IPv6 network. This argument must be in the form documented in RFC 4293 where the address is specified in hexadecimal—using 16-bit values between colons.

Prefix Length

The length of the IPv6 prefix. A decimal value that indicates how many of the high-order contiguous bits of the address comprise the prefix (the network portion of the address). A slash mark must precede the decimal value.

Prefix Advertisement

Select to advertise this prefix.

Valid Lifetime

The remaining length of time, in seconds, that this prefix will continue to be valid, i.e., time until invalidation. The address generated from an invalidated prefix should not appear as the destination or source address of a packet.

  • Infinite—Select this value to set the field to 4,294,967,295, which represents infinity.

  • User Defined—Enter a value.

Preferred Lifetime

The remaining length of time, in seconds, that this prefix will continue to be preferred. After this time has passed, the prefix should no longer be used as a source address in new communications, but packets received on such an interface are processed as expected. The preferred-lifetime must not be larger than the valid-lifetime.

  • Infinite—Select this value to set the field to 4,294,967,295, which represents infinity.

  • User Defined—Enter a value.

Auto Configuration

Enable automatic configuration of IPv6 addresses using stateless auto configuration on an interface and enable IPv6 processing on the interface. Addresses are configured depending on the prefixes received in Router Advertisement messages.

Prefix Status

Select one of the following options:

  • Onlink—Configures the specified prefix as on-link. Nodes sending traffic to addresses that contain the specified prefix consider the destination to be locally reachable on the link. An onlink prefix is inserted into the routing table as a connected prefix (L-bit set).

  • No-Onlink—Configures the specified prefix as not on-link. A no-onlink prefix is inserted into the routing table as a connected prefix but advertised with a L-bit clear.

  • Offlink—Configures the specified prefix as off link. The prefix will be advertised with the L-bit clear. The prefix will not be inserted into the routing table as a connected prefix. If the prefix is already present in the routing table as a connected prefix (for example, because the prefix was also configured by adding an IPv6 address), it will be removed.

Step 6

Click Apply to save the configuration to the Running Configuration file.