Adjusting Quality of Service for SnapProtect Network Traffic on Clients

If you have clients where the SnapProtect software competes with other applications for bandwidth, you can adjust the Quality of Service (QoS) of the SnapProtect network traffic by setting the appropriate Differentiated Services Code Point (DSCP) value.

  • QoS is the quality of data transmission in the Internet (or intranet). The goal of QoS is to efficiently use the network by providing higher quality transmission to certain subsets of data.
  • DSCP is a computer networking architecture that manages network traffic and provides QoS on IP networks.

The operation of setting DSCP values on SnapProtect data packets is known as QoS packet marking in the networking industry. The transmission quality of the SnapProtect data is determined based on the DSCP value that you set.

By default, SnapProtect uses DSCP value 0 (best effort). You can set a different DSCP value on Windows clients or client groups by adding an additional setting from the CommCell Console. UNIX clients are not supported.

Before You Begin

If you want to adjust the QoS on multiple clients, we recommend that you associate the clients to a client group. You can set the DSCP value on a client group.


  1. From the CommCell Browser, go to the additional setting properties of the client or client group.
    On a Client On a Client Group
    1. Expand Client Computers, right-click the Client and click Properties.
    2. In the Client Computer Properties dialog box, click Advanced.
    3. In the Advanced Client Properties dialog box, click the Additional Settings tab and then click Add.
    1. Expand Client Computer Groups, right-click the Client_Group and click Properties.
    2. In the Client Group dialog box, click the Additional Settings tab and then click Add.
  2. In the Add Additional Settings on Windows Client dialog box, complete the following steps:
    1. In the Name box, type qosDscp.
    2. In the Category box, select Session.
    3. In the Type box, select INTEGER.
    4. In the Value box, enter the appropriate DSCP value, which can range from 0 to 64.

      For your reference, the following table provides sample DSCP values for each precedence level:

      Precedence Level Description DSCP Value for qosDscp Example
      CS0 Best effort for unclassified traffic (This is the default value) 0  
      CS1 Class 1 8 YouTube, Gaming applications, P2P
      CS2 Class 2 16 SNMP protocols, SSH protocols, System Logs
      CS3 Class 3 24 SCCP, SIP, H.323
      CS4 Class 4 32 TelePresence
      CS5 Express Forwarding (EF) 40 Cisco IPVS
      CS6 Traffic stays the same (used for IP routing protocols) 48 EIGRP,OSPF,HSRP,IKE
      CS7 Traffic stays the same (link layer and routing protocol keep alive) 56  
    5. Click OK.
  3. In the client or client group properties dialog box, click OK.

    The network routers will classify the SnapProtect data packets based on the DSCP value that you configured.