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Manual Chapter: Configuring WCCPv2 Redirection
Manual Chapter
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TMOS® includes support for Web Cache Communication Protocol version 2 (WCCPv2) if you have provisioned the WAN Optimization Module. WCCPv2 is a content-routing protocol developed by Cisco Systems. It provides a mechanism to redirect traffic flows in real time. The primary purpose of the interaction between WCCPv2-enabled routers and a BIG-IP® system is to establish and maintain the transparent redirection of selected types of traffic flowing through those routers.
In configuring WCCPv2 on a network, you must define a service group on the BIG-IP system. A service group defines a group of WCCPv2 services configured on the BIG-IP system, and each service identifies one or more WCCPv2-enabled routers. A WCCPv2 service in this context is a set of redirection criteria and processing instructions that the BIG-IP system applies to any traffic that a router in the service group redirects to the BIG-IP system.
Figure 7.1 shows an example of a WCCPv2 configuration, where the cache systems represent BIG-IP systems.
To use WCCPv2, you must enable WCCPv2 on one or more routers connected to the BIG-IP system, and then configure a service group on the BIG-IP system. The BIG-IP system then receives all of the network traffic from each router in the associated service group, and determines both the traffic to optimize and the traffic to which to apply a service. The BIG-IP system then sends the rest of the traffic back to the router for proper forwarding.
The advantage of this deployment method is that a router on the network is more tolerant of a failure. If the router detects a BIG-IP system failure, the router handles the traffic properly without sending it back to the BIG-IP system.
Note: You can also view the list of service groups using the bigpipe utility. For more information, see the Bigpipe Utility Reference Guide.
On the Main tab of the navigation pane, you can view the list of service groups by expanding Network, and clicking WCCP.
This displays a list of existing WCCPv2 service groups.
When you view the list of service groups, the system also displays a set of properties associated with each service group. These properties are:
For descriptions of the Name and Cache Timeout (sec) properties, see Table 7.1. If you want to view the list of services in the service group, see Viewing and changing service group properties.
You can use the Configuration utility to create a new service group. When you create a service group, you also configure an initial service to associate with the service group.
The settings for creating a service group and its initial service are summarized in Table 7.1, followed by the procedure for creating the service group.
Displays the frequency, in seconds, of the control messages exchanged between the system and the router. The control messages help a router to determine whether the BIG-IP system is still active. If the router sends three consecutive messages to the BIG-IP system at the specified frequency without receiving a response, the router considers the BIG-IP system to be unavailable.
Specifies the service group identifier that matches a service ID configured on the router. WCCPv2 allows any number from 0 to 254.
Specifies that the WCCPv2 interception of traffic is based on the source port (Source) or the destination port (Destination), or is not specified (None).
Negotiated: Specifies that the system negotiates with the router regarding the return method for optimized traffic, depending on whether the router can support the value selected for Return Method.
IP Forwarding: Specifies that the system forwards optimized traffic normally (without tunneling), regardless of the value selected for the Return Method setting.
Specifies whether load balancing is achieved by a hash algorithm or a mask. If you select Hash, specify one or more values in the Hash Fields setting.
Specifies one or more IP addresses or ports on which the system bases its load balancing algorithm. Use the Move buttons (<< and >>) to adjust the values included in the hash. Possible values are Source IP, Destination IP, Source Port, and Destination Port.
Specifies the WCCPv2 Router Identifier IP address of the router, which the system uses to create a tunnel to the router, for redirecting traffic.
Specifies an IP address of the BIG-IP system to which the WCCPv2-enabled routers should redirect traffic. For this setting, you must specify a self IP address of an external VLAN on the BIG-IP system.
1.
On the Main tab of the navigation pane, expand Network, and click WCCP.
This displays a list of existing WCCPv2 service groups.
Note: If the Create button is unavailable, you do not have permission to access the New WCCP Service screen. You must have either the Administrator or Resource Administrator role assigned to your user account.
3.
In the Service Group box, type the name of a new service group.
Note: If you do not want to create a new service group but want to configure a service for an existing service group instead, see Adding a service to an existing service group.
4.
Configure an initial service for this new service group, using the remaining settings on the screen.
For descriptions of these settings, see Table 7.1, proceeding.
5.
Click Finished.
When you created one or more service groups, you also configured a service for each service group. Using the Configuration utility, you can configure additional services for a service group, by configuring the New WCCP Service screen.
1.
On the Main tab of the navigation pane, expand Network, and click WCCP.
This displays a list of existing WCCPv2 service groups.
2.
On the upper-right area of the screen, click Create.
The New WCCP Service screen opens.
Note: If the Create button is unavailable, you do not have permission to access the New WCCP Service screen. You must have either the Administrator or Resource Administrator role assigned to your user account.
3.
From the Service Group list, select the name of an existing service group.
4.
Configure all settings for the new service.
For a description of these settings, see Table 7.1.
5.
Click Finished.
1.
On the Main tab of the navigation pane, expand Network, and click WCCP.
This displays a list of existing WCCPv2 service groups.
2.
In the Name column, click the name of the service group to which you want to add a service.
This displays the properties of that service group.
3.
On the right side of the screen, click Add.
The New WCCP Service screen opens.
Note: If the Add button is unavailable, you do not have permission to access the New WCCP Service screen. You must have either the Administrator or Resource Administrator role assigned to your user account.
4.
Configure all settings for the new service.
For a description of these settings, see Table 7.1.
5.
Click Finished.
1.
On the Main tab of the navigation pane, expand Network, and click WCCP.
This displays a list of existing WCCPv2 service groups.
2.
In the Name column, click the name of the service group that you want to view or change.
The service group name and cache timeout value display on the screen, as well as the list of associated services.
Note: You cannot change the name of the service group. If you want to change the name, you must delete the service group and create the service group again, with a different name.
3.
If you need to change the cache timeout value, change the value in the Cache Timeout (sec) box, and click Finished.
1.
On the Main tab of the navigation pane, expand Network, and click WCCP.
This displays a list of existing WCCPv2 service groups.
4.
Click Delete.
A confirmation screen appears.
5.
Click Delete.
For any service associated with a service group, you can view or change its properties, or you can delete the service group altogether.
For any services that you have defined for a service group, you can view the properties of those services, or if necessary, change their properties at any time.
1.
On the Main tab of the navigation pane, expand Network, and click WCCP.
This displays a list of existing WCCPv2 service groups.
2.
In the Name column, click the name of the service group that contains the service you want to view or change.
This displays the properties of that service group.
3.
In the Service column, click a service number.
The service properties and current configuration values display on the screen.
1.
On the Main tab of the navigation pane, expand Network, and click WCCP.
This displays a list of existing WCCPv2 service groups.
2.
In the Name column, click the name of the service group that contains the service you want to delete.
This displays the properties of the service group.
5.
Click Remove.
A confirmation screen appears.
6.
Click Remove.
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