# Configuring route advertisement

Use this procedure to configure router advertisement in IPv6 for neighbor discovery (ND). IPv6 nodes on the same link use ND to discover link-layer addresses and to obtain and advertise various network parameters and reachability information. ND combines the services provided by Address Resolution Protocol (ARP) and router discovery for IPv4.

## Procedure steps

1. From the navigation tree, double-click IPv6.

2. Double-click IPv6.

3. Click the Route Advertisement tab.

4. Edit the fields as required.

5. Click Apply.

## Variable definitions

The following table describes the fields of the Route Advertisement tab.

Variable | Value
--- | ---
IfIndex | Specifies a unique value to identify a physical interface or a logical interface (VLAN).
SendAdverts | Indicates whether the router sends periodic router advertisements and responds to router solicitations on this interface. The default is True.
UseDefaultVal | Select one included value to use the default value, or use all bits to configure all options to their default value.
MaxInterval | Configures the maximum interval (in seconds) at which the transmission of router advertisements occurs on this interface. This must be no less than 4 seconds and no greater than 1800 seconds. The default is 600.
MinInterval | Configures the minimum interval (in seconds) at which the transmission of router advertisements can occur on this interface. The value must be no less than 3 seconds and no greater than .75 x max-interval. The default is 200.
ReachableTime | Specifies the value (in milliseconds) placed in the router advertisement message sent by the router. The value zero means unspecified (by this router). Configure the amount of time that a remote IPv6 node is considered reachable after a reachability confirmation event. The default is 30000.
RetransmitTimer | Specifies the value (in milliseconds) placed in the retransmit timer field in the router advertisement message sent from this interface. The value zero means unspecified (by this router). The value configures the amount of time that router waits for the transmission to occur. The default is 1000.
DefaultLifeTime | Specifies the value placed in the router lifetime field of router advertisements sent from this interface. This value must be either 0 or between rcIpv6RouterAdvertMaxInterval and 9000 seconds. A value of zero indicates that the router is not a default router. The default is 3 times the value of rcIpv6RouterAdvertMaxInterval or 1800.
CurHopLimit | Specifies the default value placed in the current hop limit field in router advertisements sent from this interface. The value must be the current diameter of the Internet. A value of zero in the router advertisement indicates that the advertisement is not specifying a value for CurHopLimit. The value must be the value specified in the IANA Web pages (www.iana.org). The default is 30.
ManagedFlag | If enabled, the ManagedFlag configures the M-bit or the managed address configuration in the router advertisement. The default is false.
OtherConfigFlag | If set to true, then the O-bit (Other stateful configuration) in the router advertisement is set. Reference RFC2461 Section 6.2.1. The default value is false.
DadNSNum | Specifies the number of neighbor solicitation messages for duplicate address detection (DAD). A value of 0 disables the DAD process on this interface. A value of 1 sends one advertisement without retransmissions.
LinkMTU | Specifies the value placed in MTU options sent by the router on this interface. A value of zero indicates that the router sends no MTU options.