Traffic prioritization and bandwidth throttling?

[Jeff_Browning_2]

This question came up recently from a CTO at a large North American company: "Does iControl allow for layer seven prioritization rules? Bandwidth throttling?" Any help would be much appreciated! Thanks, Jeff

[Gary_Chen_31612]

As for the layer 7 traffic prioritization. One may consider using the following approach. There are iControl methods to set ToS/QoS value of a Pool entity to manage the traffic via a virtual server based on the ToS/Qos value of the packet. The iControl methods used for setting the value of Tos/Qos are listed below, For setting ToS value of a pool, please consider the followings: For inbound traffic, 1. ITCMLocalLB.Pool.set_server_ip_tos 2. ITCMLocalLB.Pool.set_server_link_qos For outbound traffic, 1. ITCMLocalLB.Pool.set_client_ip_tos 2. ITCMLocalLB.Pool.set_client_link_qos In addition to configuring a Pool that sets the ToS/QoS level on a packet, one can configure a rule that selects a Pool based on the existing value within the packet. Once the rule is completed, you may associate the rule to a virtual server. An example of rule content on ToS is given below,

 
 if (link_qos > 2) { 
     use pool fast_pool 
 } 
 else { 
     use pool slow_pool 
 } 
 

The APIs for creatinig a Rule and associate the Rule to a virtual server is given below, 1. ITCMLocalLB.Rule.create_rule 2. ITCMLocalLB.VirtualServer.create_from_rule Gary Chen