docs/docs/routing/bird/protocols/babel/bird2_babel.md

Bird 2 Babel configuration

In /etc/bird/crxn/babel.conf place the following template:

# CRXN Babel protocol
protocol babel crxnBabel
{

    # Interfaces to run babel on
    interface "interface1", "interface2";

    ipv6
    {
        import filter crxnFilter;
        export filter crxnFilter;
        table crxn;
    };
}

1. Set the interface list to a list of interfaces you wish the babel protocol to run on
   • It also supports regex in a string so you can do "interface*" for example

And that is all!