NBR_STA_REQ_RCVD
case NBR_STA_REQ_RCVD:
nbr->state != NBR_STA_REQ_RCVD)
{NBR_STA_DOWN, NBR_EVT_REQUEST_RCVD, NBR_ACT_NOTHING, NBR_STA_REQ_RCVD},
{NBR_STA_REQ_RCVD, NBR_EVT_RESPONSE_SENT, NBR_ACT_DEL, NBR_STA_DOWN},