Quality of Service , QOS with Priority
Each VLAN can be assigned a specific amount of reserved bandwidth upon ingress on a specific port. Upon egress out the fiber pipe packets transverse the network using the IEEE 802.1p bit priority tag.

In addition, to avoid ingress data over-running at the input side of the fiber pipe, your total pipe size can be multiplied by as much as 1.5 times that of the pipe size commitment.

For example:
Video, Voice and Data specific QOS VLAN physical ports can be assigned a specific traffic slice of the pipe size bandwidth that is specifically reserved for that traffic. That specific slice is the minimum. Any traffic beyond that minimum allocation can utilize the additional pipe size bandwidth on a Priority bases. Voice can have the highest priority assigned, Video the second highest and Data the third. Traffic for Video can utilize the extra bandwidth that Voice is not using above it's minimum reserve. Voice also gets to utilize anything else upto the maximum alloted overall.

Tips:
It is best that each port utilize one or more Layer3 subnets. As packets transverse a specific ports the utilization of subnet Layer 3 hopping, keeps up traffic speed. As it helps prevent Central Office router MAC table over runs that may block specific late arriving packets due to a full MAC address allocation. It is best to utilize Layer3 hops from no more than 4 to 5 unique MAC address devices on each side of your pipe to assure, speed and prevent blocking and repeated table changes.

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