ZyXEL VMG1312-B10A User Guide - Page 160
IEEE 802.1Q Tag
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Chapter 10 Quality of Service (QoS) Table 51 Policer Setup: Add/Edit LABEL Conforming Action DESCRIPTION Specify what the Device does for packets within the committed rate and burst size (greenmarked packets). NonConforming Action Available Class • Pass: Send the packets without modification. • DSCP Mark: Change the DSCP mark value of the packets. Enter the DSCP mark value to use. Specify what the Device does for packets that exceed the excess burst size or peak rate and burst size (red-marked packets). • Drop: Discard the packets. • DSCP Mark: Change the DSCP mark value of the packets. Enter the DSCP mark value to use. The packets may be dropped if there is congestion on the network. Select a QoS classifier to apply this QoS policer to traffic that matches the QoS classifier. Selected Class Highlight a QoS classifier in the Available Class box and use the > button to move it to the Selected Class box. Apply Cancel To remove a QoS classifier from the Selected Class box, select it and use the < button. Click Apply to save your changes. Click Cancel to exit this screen without saving. 10.7 Technical Reference The following section contains additional technical information about the Device features described in this chapter. IEEE 802.1Q Tag The IEEE 802.1Q standard defines an explicit VLAN tag in the MAC header to identify the VLAN membership of a frame across bridges. A VLAN tag includes the 12-bit VLAN ID and 3-bit user priority. The VLAN ID associates a frame with a specific VLAN and provides the information that devices need to process the frame across the network. IEEE 802.1p specifies the user priority field and defines up to eight separate traffic types. The following table describes the traffic types defined in the IEEE 802.1d standard (which incorporates the 802.1p). Table 52 IEEE 802.1p Priority Level and Traffic Type PRIORITY LEVEL TRAFFIC TYPE Level 7 Typically used for network control traffic such as router configuration messages. Level 6 Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations in delay). Level 5 Typically used for video that consumes high bandwidth and is sensitive to jitter. Level 4 Typically used for controlled load, latency-sensitive traffic such as SNA (Systems Network Architecture) transactions. Level 3 Typically used for "excellent effort" or better than best effort and would include important business traffic that can tolerate some delay. Level 2 This is for "spare bandwidth". VMG1312-B Series User's Guide 160