Router Advertisement

A router advertisement packet contains various configurations for IPv6 hosts including the network part of the layer 3 IPv6 address required by hosts to communicate in the internet. Clients then generate the universally unique host part of the address and derive the complete address. This feature can be enabled or suppressed per interface, as follows:

Procedure


Step 1

Click IPv6 Configuration > IPv6 Router Configuration > Router Advertisement.

Step 2

To configure an interface listed in the Router Advertisement Table, select it and click Edit.

Step 3

Enter the following fields:

OptionDescription

Interface

Select the interface from the drop down list.

Suppress Router Advertisement

Select Yes to suppress IPv6 router advertisement transmissions on the interface.

Router Preference

Select either Low, Medium or High preference for the router. Router advertisement messages are sent with the preference configured in this field. If no preference is configured, they are sent with a medium preference.

Include Advertisement Interval Option

Select to indicate that an advertisement option will be used by the system. This option indicates to a visiting mobile node the interval at which that node may expect to receive router advertisements. The node may use this information in its movement detection algorithm.

Hop Limit

This is the value that the router advertises. If it’s not zero, it’s used as the hop limit by the host.

Managed Address Configuration Flag

Select this flag to indicate to attached hosts that they should use stateful auto configuration to obtain addresses. Hosts may use stateful and stateless address auto configuration simultaneously.

Other Stateful Configuration Flag

Other Stateful Configuration Flag—Select this flag to indicate to attached hosts that they should use stateful auto configuration to obtain other (non-address) information.

Note

If the Managed Address Configuration flag is set, an attached host can use stateful auto configuration to obtain the other (non-address) information regardless of the setting of this flag.

Neighbor Solicitation Retransmissions Interval

Enter the interval to determine the time between retransmissions of neighbor solicitation messages to a neighbor when resolving the address or when probing the reachability of a neighbor (User Defined), or select Use Default to use the system default (1000).

Maximum Router Advertisement Interval

Enter the maximum amount of time that can pass between router advertisements.

The interval between transmissions should be less than or equal to the IPv6 router advertisement lifetime if you configure the route as a default router by using this command. To prevent synchronization with other IPv6 nodes, the actual interval used is randomly selected from a value between the minimum and maximum values.

Minimum Router Advertisement Interval

Enter the minimum amount of time that can pass between router advertisements (User Defined) or select Use Default to user the system default.

Note

The minimum RA interval may never be more than 75% of the maximum RA interval and never less than 3 seconds.

Router Advertisement Lifetime

Enter the remaining length of time, in seconds, that this router remains useful as a default router. A value of zero indicates that it’s no longer useful as a default router.

Reachable Time

Enter the amount of time that a remote IPv6 node is considered reachable (in milliseconds) (User Defined) or select the Use Default option to use the system default.

Step 4

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