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(Optional) Configuring the 802.1p Priority and DSCP Priority for a Voice VLAN
Context
By default, the 802.1p priority and DSCP priority for
a voice VLAN are 6 and 46 respectively. You can dynamically configure
802.1p priority and DSCP priority to plan priorities for different
voice services.
The 802.1p priority is indicated by the value in the 3-bit PRI field in each 802.1Q VLAN frame. This field determines the transmission priority for data packets when a switching device is congested.
The DSCP value is indicated by the 6 bits in the Type of Service (ToS) field in the IPv4 packet header. DSCP, as the signaling for DiffServ, is used for QoS guarantee on IP networks. The traffic controller on the network gateway takes actions merely based on the information carried by the 6 bits.