The Main router forwards any packets destined for interfaces exterior to the SPB network, or for whatever reason are not resolved by the Helper routers within the RaaS. VRRP is configured on interfaces within the SPB network.
Main routers identify themselves to the Helper routers by way of an Main router ID unique to each Main router in the format of an IPv4 address.
Static routes to the Helper Router Loopback address for each VLAN in the SPB network provides for the Main Router ARP updates to the Helper Router.
Use the raas command, in global router configuration mode, to specify the Main router ID.