Chapter 10 Quality of Service (QoS)
XMG3512-B10A User’s Guide
145
10.8 Technical Reference
The following section contains additional technical information about the XMG 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.
Meter Type
This shows the traffic metering algorithm used in this policer.
The
Simple Token Bucket
algorithm uses tokens in a bucket to control when traffic can be
transmitted. Each token represents one byte. The algorithm allows bursts of up to
b
bytes which is
also the bucket size.
The
Single Rate Three Color Marker
(srTCM) is based on the token bucket filter and identifies
packets by comparing them to the Committed Information Rate (CIR), the Committed Burst Size
(CBS) and the Excess Burst Size (EBS).
The
Two Rate Three Color Marker
(trTCM) is based on the token bucket filter and identifies
packets by comparing them to the Committed Information Rate (CIR) and the Peak Information
Rate (PIR).
Committed
Rate
Specify the committed rate. When the incoming traffic rate of the member QoS classes is less
than the committed rate, the device applies the conforming action to the traffic.
Committed
Burst Size
Specify the committed burst size for packet bursts. This must be equal to or less than the peak
burst size (two rate three color) or excess burst size (single rate three color) if it is also configured.
This is the maximum size of the (first) token bucket in a traffic metering algorithm.
Conforming
Action
Specify what the XMG does for packets within the committed rate and burst size (green-marked
packets).
•
Pass:
Send the packets without modification.
•
DSCP Mark:
Change the DSCP mark value of the packets. Enter the DSCP mark value to use.
Non-
Conforming
Action
Specify what the XMG 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.
Available Class
Selected Class
Select a QoS classifier to apply this QoS policer to traffic that matches the QoS classifier.
Highlight a QoS classifier in the
Available Class
box and use the
>
button to move it to the
Selected Class
box.
To remove a QoS classifier from the
Selected Class
box, select it and use the
<
button.
OK
Click
OK
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 52 Policer Setup: Add/Edit
LABEL
DESCRIPTION
Summary of Contents for XMG3512-B10A
Page 14: ...14 PART I User s Guide ...
Page 23: ...Chapter 1 Introducing the XMG XMG3512 B10A User s Guide 23 Figure 8 Wall Mounting Example ...
Page 33: ...Chapter 3 Quick Start XMG3512 B10A User s Guide 33 Figure 16 Quick Start Result Summary ...
Page 56: ...56 PART II Technical Reference ...
Page 279: ...Appendix D Legal Information XMG3512 B10A User s Guide 279 Environmental Product Declaration ...
