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Page 201 / 382 Scroll up to view Page 196 - 200
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
201
VLAN ID
This field is available only when you select
802.1Q
in the
Ether Type
field.
Select this option and specify a VLAN ID number between 1 and 4095.
IP Protocol
This field is available only when you select
IP
in the
Ether Type
field.
Select this option and select the protocol (service type) from
TCP
,
UDP
,
ICMP
or
IGMP
. If you select
User defined
, enter the protocol
(service type) number.
IP Packet
Length
This field is available only when you select
IP
in the
Ether Type
field.
Select this option and enter the minimum and maximum packet
length (from 28 to 1500) in the fields provided.
DSCP
This field is available only when you select
IP
in the
Ether Type
field.
Select this option and specify a DSCP (DiffServ Code Point) number
between 0 and 63 in the field provided.
TCP ACK
This field is available only when you select
IP
in the
Ether Type
field.
If you select this option, the matched TCP packets must contain the
ACK (Acknowledge) flag.
DHCP
This field is available only when you select
IP
in the
Ether Type
field.
Select this option and select a DHCP option.
If you select
Vendor Class ID (DHCP Option 60)
, enter the Vendor
Class Identifier (Option 60) of the matched traffic, such as the type of
the hardware or firmware.
If you select
User Class ID (DHCP Option 77)
, enter a string that
identifies the user’s category or application type in the matched DHCP
packets.
Exclude
Select this option to exclude the packets that match the specified
criteria from this classifier.
Back
Click
Back
to return to the previous screen without saving.
Apply
Click
Apply
to save your changes back to the Device.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 70
QoS Class Configuration (continued)
LABEL
DESCRIPTION
Page 202 / 382
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
202
16.6
The Policer Setup Screen
Click
QoS > Policer Setup
to open the screen as shown next. Use this screen to
configure QoS policers to limit the transmission rate of incoming traffic. This lets
you prevent high priority packets from choking off all other traffic.
Figure 104
Policer Setup
The following table describes the labels in this screen.
Table 71
QoS Policer Setup
LABEL
DESCRIPTION
Add
Click this button to create a new entry.
No.
This is the index number of this entry.
Active
Select the check box to enable the policer.
Name
This shows the descriptive name of this queue.
Regulated
Classes
These are the policer’s member QoS classes (classifiers).
Meter Type
This shows which QoS metering algorithm the policer uses to shape traffic.
Parameter
These are the rates and burst sizes against which the policer checks the
traffic of the member QoS classes.
Action
This shows the how the policer has the Device treat different types of
traffic belonging to the policer’s member QoS classes.
Modify
Click the
Edit
icon to go to the screen where you can edit the policer.
Click the
Remove
icon to delete an existing queue. Note that subsequent
rules move up by one when you take this action.
Apply
Click
Apply
to save your changes back to the Device.
Page 203 / 382
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
203
16.6.1
Adding a QoS Policer
Click the
Add
button or the edit icon in the
Policer Setup
screen to configure a
policer.
Figure 105
Policer Setup: Add
The following table describes the labels in this screen.
Table 72
QoS Policer Setup: Add
LABEL
DESCRIPTION
Enable
Select this to turn on this policer.
Name
Enter the descriptive name of this policer.
Page 204 / 382
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
204
Meter Type
Select how the policer shapes the traffic of the member QoS classes.
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.
Excess Burst
Size
Specify the burst size of packet bursts above which the device will
perform the non-conforming action.
Peak Rate
Specify the peak rate. When the incoming traffic rate of the member
QoS classes is greater than the peak rate, the device applies the non-
conforming action to the traffic.
Peak Burst
Size
Specify the peak burst size. This is the maximum size of the second
token bucket in the trTCM.
Conforming
Action
Specify what the Device 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.
Partial
Conforming
Action
Specify what the Device does for packets that exceed the committed
rate and burst size but are within the excess burst size or peak rate and
burst size (yellow-marked packets).
•
Pass
: Send the packets without modification.
•
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.
Non-
Conforming
Action
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.
Table 72
QoS Policer Setup: Add
LABEL
DESCRIPTION
Page 205 / 382
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
205
16.7
The QoS Monitor Screen
To view the Device’s QoS packet statistics, click
Advanced > QoS >
Monitor
. The
screen appears as shown.
Figure 106
QoS > Monitor
Regulated
Classes
Member Setting
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
Add
>>
button to move it to the
Selected Class
box.
To remove a QoS classifier from the
Selected Class
box, select it and
use the
Remove
button.
Back
Click
Back
to return to the previous screen without saving.
Apply
Click
Apply
to save your changes back to the Device.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 72
QoS Policer Setup: Add
LABEL
DESCRIPTION

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