This attribute indicates the urgency with which packets on the path
are emitted by the trunks on the route. The originating end of the
connection selects the emissionPriority. EmissionPriority of zero
indicates the highest emission priority, while two indicates the
lowest emission priority. Packets with a higher emissionPriority (or
numerically less) are serviced and sent out before the packets of
lower emissionPriority (or numerically higher).