4.To enable IPv6 RA on a VLAN, select the Enable Router Advertisements (RA) check box under Neighbor Discovery.

5.To configure IPv6 RA prefix for a VLAN, follow the steps below:

a.Under Neighbor Discovery, enter an IPv6 prefix in the IPv6 RA Prefix field.

b.ClickAdd to configure an IPv6 prefix for the VLAN.

You can add up to three IPv6 prefixes per VLAN interface.

6. ClickApply to apply the configurations.

Using CLI

Execute the following commands to configure router advertisements on a VLAN:

(host) (config) #interface vlan <vlanid>

(host) (config-subif)#ipv6 address <prefix>/<prefix-length>

(host) (config-subif)#ipv6 nd ra enable

(host) (config-subif)#ipv6 nd ra prefix X:X:X:X::X/64

Configuring Optional Parameters for RAs

In addition to enabling the RA functionality, you can configure the following IPv6 neighbor discovery and RA options on a VLAN:

•Neighbor discovery reachable time: The time, in milliseconds, that a node assumes a neighbor is reachable after receiving a reachability confirmation.

•Neighbor discovery retransmit time: The time, in milliseconds, between retransmitted Neighbor Solicitation messages.

•RA DNS: The IPv6 recursive DNS Server for the VLAN.

NOTE: • On Linux systems, the clients must run the open rdnssd daemon to support the DNS server option.

•Windows 7 does not support DNS server option.

•RA hop-limit: The IPv6 RA hop-limit value. It is the default value to be placed in the Hop Count field of the IP header for outgoing (unicast) IP packets.

•RA interval: The maximum and minimum time interval between sending unsolicited multicast router advertisements from the interface, in seconds.

•RA lifetime: The lifetime associated with the default router in seconds. A value of 0 indicates that the router is not a default router and will not appear on the default router list. The router lifetime applies only to the router's usefulness as a default router; it does not apply to information contained in other message fields or options.

•RA managed configuration flag (Enable DHCP for address): A flag that indicates that the hosts can use the DHCP server for address autoconfiguration besides using RAs.

•RA maximum transmission unit (MTU): The maximum transmission unit that all the nodes on a link use.

•RA other configuration flag (Enable DHCP for other information): A flag that indicates that the hosts can use the administered (stateful) protocol for autoconfiguration of other (non-address) information.

•RA preference: The preference associated with the default router.

You can use the WebUI or CLI to configure these options.

NOTE: It is always recommended to retain the default value of the RA interval to achieve better performance.

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