bgp announce default route to lower router, what is the bird version of default-originate / default-information orginate?

[Gelderman, Richard]

How can I announce a default route to a lower router who does not need a full table.
What is de Bird equivalent  of "default-orginitate" or "default-information originate".

Currently I use a filter with a static blackhole route:


protocol static {

route 0.0.0.0/0 blackhole;

}

filter senddefault {
        if net = 0.0.0.0/0 then accept;
        reject;
}

template bgp local_as_ibgp_lowrouter {

#
       export filter senddefault;

}

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