function add_control(int kkkey; int value)
{
        bgp_large_community.add((OWNAS, kkkey, value));
}

function strip_control()
{
        bgp_large_community.delete([(OWNAS, *, *)]);
}

function has_control(int kkkey; int value)
{
        return (OWNAS,kkkey,value) ~ bgp_large_community;
}

function tag_route(int origin)
{
        add_control(ROUTEORIGIN, origin);
        add_control(ORIGINROUTER, MYID);
}

function ix_import() {
        strip_control();
        tag_route(DFZ);
}

function ix_export() {
        if !has_control(ANNOUNCETO, DFZ) then reject;
        strip_control();
}

template bgp ixpeers {
        local as OWNAS;

        import limit 1000 action disable;
        import keep filtered;
        import filter {
                ix_import();
                accept;
        };
        export filter {
                ix_export();
                accept;
        };
        next hop self;
}

<Actual protocol omitted, it just adds a neighbor and a description>