Product Documentation

Traffic Shaping Policies

Jun 06, 2013

The Configuration: Traffic Shaping Policies page allows you to add traffic-shaping policies. The default policies are adequate for most installations and cannot be edited or deleted (except for the ICA Priorities and Default policies). However, if you have special requirements, new polices can be added or edited.

Figure 1. Traffic Shaping Policies Page

Creating and Editing Policies

Pressing the Create button takes you to the Create Policy page, which has the following fields (some of which are hidden by default, but can be revealed with the Show Advanced Options button):

Figure 2. Create Policy Page
  • Name--The name of the new policy. Must be unique.
  • Weighted Priority--This can be the same as an existing priority value or can be a custom value between 1 and 256. A connection with a priority of 256 will get 256 times the bandwidth share as a connection with a priority of 1.
  • Set ICA Priorities--If this policy will be used for Citrix XenApp/XenDesktop traffic, the traffic’s internal priority values can be mapped to CloudBridge priorities.
  • Optimize for Voice--If checked, this policy will have effectively infinite priority. This is highly undesirable for most traffic, since it will prevent meaningful traffic shaping and will cause data starvation for other traffic if there is enough “optimized for voice” traffic to fill the link. Use only for VoIP, and always use in conjunction with a bandwidth limit on the policy (for example, 50% of the link speed).
  • Set Diffserv/TOS--Sets the Diffserv field of matching traffic to the indicated value, informing downstream routers of the traffic priority.
  • Set ICA Diffserv/TOS--As above, but allows the Diffserv field to be set differently depending on the priority field within the ICA data stream. Has no effect on non-ICA traffic.
  • Limit Bandwidth--Prevents the traffic from this policy from exceeding a specified percentage of link bandwidth, or a specified absolute rate. Because this limits performance, it is rarely used except with voice traffic.
  • Editing policies is essentially identical to creating new ones.