Support: L2,IP
    Default: Receive       Value: Set of send,receive

    If the set includes receive, external gateway routes are accepted
    from neighbors in the group; if the set does not include receive,
    external gateway routes are discarded. If the set includes send,
    external gateway routes will be sent to neighbors in this group;
    if the set does not include send, external gateway routes are not
    sent. You can modify this characteristic only when the entity is
    disabled.