11.2.5. Bandwidth control setting
| Operation Confirmed Version: |
|---|
| | Citrix Netscaler VPX Version11.0 Build67.12 Standard Edition |
For the Road Balancer, Rate Limiting function can define the maximum load of a specific interface.
With this function, adjustment based on the traffic set in real time is possible. As a result, excessive load to the server side can be reduced.
Method to set an upper limit of the performance to a Load Balancer interface will be introduced here.
Presumed case for sample setting
Assume that we want to set an upper limit of the communication performance (8192Kbps) to the client-side interface of the Load Balancer (192.168.2.11).
Also assume that if new communication request comes while the communication has reached the upper limit of the performance, we like to discard the packets.
From the [ Configuration ] menu, move to [ AppExpert ] → [ Rate Limiting ] → [ Limit Identifiers ].
After the Limit Identifiers screen is displayed, click [ Add ].
The Create Limit Identifier screen will be displayed. Input the information as the table below.
Setting Items
|
Setting value
|
| Name |
Ratelimit01 (any Limit Identifier name)
|
| Selector |
Top_URL |
| Mode |
NONE |
| Threshold |
1 |
| Maximum Bandwidth (Kbps) |
8192 |
| Traps |
0 |
Input the set values and click [ Create ].
The Limit Identifiers screen will be displayed. Check that the set Limit Identifier is displayed.
Proceed to [AppExpert], [Responder] and [Policies] in [Configuration] menu.
After the Responder Policies screen is displayed, click [ Add ].
The Create Responder Policy screen will be displayed. Input the information as the table below.
Setting Items
|
Setting value
|
| Name |
ResponderPolicy01 (any Responder Policy name)
|
| Action |
DROP |
| Undefined-Result Action |
-Global undefined-result action- |
| Expression |
HTTP.REQ.URL.CONTAINS("/") && SYS.CHECK_LIMIT("Ratelimit01") |
Note
Setting of Expression can be made on the Expression Editor screen after clicking [ Expression Editor ] but direct input of the set values is also possible.
Enter the setting value and click “Create”. When clicking “Create”, a confirmation screen for enabling the RESPONDER function may appear. In that case, click “Yes”.
As the Responder Policies screen will be displayed. Check that the set Responder Policy is displayed.
From the [ Configuration ] menu, move to [ Traffic Management ] → [ Load Balancing ] → [ Virtual Services ].
After the Virtual Services screen is displayed, select a Virtual Service you want to set the upper limit of the performance, and click [ Edit ].
The details screen of the Virtual Servers will be displayed. From [ Advanced Settings ] in the right side of the screen, click [ Policies ].
Click [ + ] in [ Policies ] section added to the details screen of the Virtual Servers.
The Choose Type screen will be displayed. Input the information as the table below.
Setting Items
|
Setting value
|
| Choose Policy |
Responder |
| Choose Type |
Request |
Input the set values and click [ Continue ].
The Choose Type screen will be displayed. Input the information as the table below.
Setting Items
|
Setting value
|
| Select Policy |
ResponderPolicy01 |
| Priority |
100 |
| Goto Expression |
END |
| Invoke LabelType |
None |
Note
To set Select Policy. Click [ Click to select ] and select [ ResponderPolicy01 ] already set from the Responder Policies screen displayed.
Input the set values and click [ Bind ].
The details screen of the Virtual Servers will be displayed. Check that [ 1 Responder Policy ] is displayed in [ Policies ], and click [ Done ].
The Virtual Servers screen will be displayed.
This completes the setting of the upper limit of the performance to the Load Balancer Interface.
Operation check result
Start up two browser screens and access a web page.
We checked that on the second browser where the upper limit was exceeded, the communication is dropped and not displayed. Therefore, we have confirmed that it is restricted by the upper limit of the performance.
