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IEEE 802.1p/Q

Another prioritization scheme is the IEEE 802.1 standard, which uses four bytes to augment the layer 2 header. The IEEE 802.1Q standard defines the open standard for VLAN tagging. Two bytes house 12 bits used to tag each frame with a VLAN identification number. The IEEE 802.1p standard uses three of the remaining bits in the 802.1Q header to assign one of eight different classes of service. G700 Media Gateways support adding 802.1Q bytes and setting the priority bits. The Avaya line of data switches can switch frames with or without these VLAN headers.


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