aggr_grp_attach_port
if (aggr_grp_attach_port(grp, port))
if (aggr_grp_attach_port(grp, cport))
*link_state_changedp = aggr_grp_attach_port(grp, port);
link_state_changed = aggr_grp_attach_port(grp, port);
extern boolean_t aggr_grp_attach_port(aggr_grp_t *, aggr_port_t *);