Enabling and disabling IPv6 router advertisements

If IPv6 unicast routing is enabled on an Ethernet interface, by default, this interface sends IPv6 router advertisement messages. However, by default, non-LAN interface types, for example, tunnel interfaces, do not send router advertisement messages.

Use the ipv6 nd suppress-ra command to disable the sending of router advertisement messages on an Ethernet interface.

device# configure terminal
device(config)# interface ethernet 1/3/1
device(config-if-e1000-1/3/1)# ipv6 nd suppress-ra

To enable the sending of router advertisement messages on a tunnel interface, enter commands such as the following.

device# configure terminal
device(config)# interface tunnel 1
device(config-tnif-1)# no ipv6 nd suppress-ra