End-of-Life (EoL)

Configure QoS for a Virtual System

QoS can be configured for a single or several virtual systems configured on a Palo Alto Networks firewall. Because a virtual system is an independent firewall, QoS must be configured independently for a single virtual system.
Configuring QoS for a virtual system is similar to configuring QoS on a physical firewall, with the exception that configuring QoS for a virtual system requires specifying the source and destination of traffic. Because a virtual system exists without set physical boundaries and because traffic in a virtual environment spans more than one virtual system, specifying source and destination zones and interfaces for traffic is necessary to control and shape traffic for a single virtual system.
The example below shows two virtual systems configured on firewall. VSYS 1 (purple) and VSYS 2 (red) each have QoS configured to prioritize or limit two distinct traffic flows, indicated by their corresponding purple (VSYS 1) and red (VSYS 2) lines. The QoS nodes indicate the points at traffic is matched to a QoS policy and assigned a QoS class of service, and then later indicate the point at which traffic is shaped as it egresses the firewall.
QoS_multiVSYS.png
Refer to Virtual Systems for information on Virtual Systems and how to configure them.
  1. Confirm that the appropriate interfaces, virtual routers, and security zones are associated with each virtual system.
    • To view configured interfaces, select
      Network
      Interface
      .
    • To view configured zones, select
      Network
      Zones
      .
    • To view information on defined virtual routers, select
      Network
      Virtual Routers
      .
  2. Identify traffic to apply QoS to.
    Select
    ACC
    to view the
    Application Command Center
    page. Use the settings and charts on the
    ACC
    page to view trends and traffic related to Applications, URL filtering, Threat Prevention, Data Filtering, and HIP Matches.
    To view information for a specific virtual system, select the virtual system from the
    Virtual System
    drop-down:
    ACC-VirtualSystem.png
    Click any application name to display detailed application information.
  3. Identify the egress interface for applications that you identified as needing QoS treatment.
    In a virtual system environment, QoS is applied to traffic on the traffic’s egress point on the virtual system. Depending the configuration and QoS policy for a virtual system, the egress point of QoS traffic could be associated with a physical interface or could be a zone.
    This example shows how to limit web-browsing traffic on vsys 1.
    Select
    Monitor
    Logs
    Traffic
    to view traffic logs. Each entry has the option to display columns with information necessary to configure QoS in a virtual system environment:
    • virtual system
    • egress interface
    • ingress interface
    • source zone
    • destination zone
    To display a column if it is not displayed by default:
    • Click any column header to add a column to the log:
      ConfigureQoS-Step2-SN1-AddEgressColumn.png
    • Click the spyglass icon to the left of any entry to display a detailed log that includes the application’s egress interface, as well as source and destination zones, in the
      Source
      and
      Destination
      sections:
      ConfigureQoS-Step2-DetailLog.png
    For example, for web-browsing traffic from VSYS 1, the ingress interface is ethernet 1/2, the egress interface is ethernet 1/1, the source zone is trust and the destination zone is untrust.
  4. Create a QoS Profile.
    You can edit any existing QoS Profile, including the default, by clicking the profile name.
    1. Select
      Network
      Network Profiles
      QoS Profile
      and click
      Add
      to open the QoS Profile dialog.
    2. Enter a descriptive
      Profile Name
      .
    3. Enter an
      Egress Max
      to set the overall bandwidth allocation for the QoS profile.
    4. Enter an
      Egress Guaranteed
      to set the guaranteed bandwidth for the QoS profile.
      Any traffic that exceeds the QoS profile’s egress guaranteed limit is best effort but is not guaranteed.
    5. In the Classes section of the
      QoS Profile
      , specify how to treat up to eight individual QoS classes:
      1. Click
        Add
        to add a class to the QoS Profile.
      2. Select the
        Priority
        for the class.
      3. Enter an
        Egress Max
        for a class to set the overall bandwidth limit for that individual class.
      4. Enter an
        Egress Guaranteed
        for the class to set the guaranteed bandwidth for that individual class.
    6. Click
      OK
      to save the QoS profile.
  5. Create a QoS policy.
    In an environment with multiple virtual systems, traffic spans more than one virtual system. Because of this, when you are enabling QoS for a virtual system, you must define traffic to receive QoS treatment based on source and destination zones. This ensures that the traffic is prioritized and shaped only for that virtual system (and not for other virtual systems through which the traffic might flow).
    1. Select
      Policies
      QoS
      and
      Add
      a QoS Policy Rule.
    2. Select
      General
      and give the QoS Policy Rule a descriptive
      Name
      .
    3. Specify the traffic to which the QoS policy rule will apply. Use the
      Source
      ,
      Destination
      ,
      Application
      , and
      Service/URL Category
      tabs to define matching parameters for identifying traffic.
      For example, select
      Application
      and
      Add
      web-browsing to apply the QoS policy rule to that application:
      ConfigureQoS-Step3-SN1-AppTab.png
    4. Select
      Source
      and
      Add
      the source zone of vsys 1 web-browsing traffic.
      QoS-VSYS-source-zone.png
    5. Select
      Destination
      and
      Add
      the destination zone of vsys 1 web-browsing traffic.
      QoS-VSYS-destination-zone.png
    6. Select
      Other Settings
      and select a
      QoS Class
      to assign to the QoS policy rule. For example, assign Class 2 to web-browsing traffic on vsys 1:
      ConfigureQoS-Step3-SN3-OtherTab.png
    7. Click
      OK
      to save the QoS policy rule.
  6. Enable the QoS Profile on a physical interface.
    It is a best practice to always define the
    Egress Max
    value for a QoS interface.
    1. Select
      Network
      QoS
      and click
      Add
      to open the QoS Interface dialog.
    2. Enable QoS on the physical interface:
      1. On the
        Physical Interface
        tab, select the
        Interface Name
        of the interface to apply the QoS Profile to.
        In this example, ethernet 1/1 is the egress interface for web-browsing traffic on vsys 1 (see 2).
        ConfigureQoS-Step5-SN1.png
      2. Select
        Turn on QoS feature on this interface
        .
    3. On the
      Physical Interface
      tab, select the default QoS profile to apply to all
      Clear Text
      traffic.
      (Optional) Use the
      Tunnel Interface
      field to apply a default QoS profile to all tunneled traffic.
    4. (Optional) On the
      Clear Text Traffic
      tab, configure additional QoS settings for clear text traffic:
      • Set the
        Egress Guaranteed
        and
        Egress Max
        bandwidths for clear text traffic.
      • Click
        Add
        to apply a QoS Profile to selected clear text traffic, further selecting the traffic for QoS treatment according to source interface and source subnet (creating a QoS node).
    5. (Optional) On the
      Tunneled Traffic
      tab, configure additional QoS settings for tunnel interfaces:
      • Set the
        Egress Guaranteed
        and
        Egress Max
        bandwidths for tunneled traffic.
      • Click
        Add
        to associate a selected tunnel interface with a QoS Profile.
    6. Click
      OK
      to save changes.
    7. Commit
      the changes.
  7. Verify QoS configuration.
    • Select
      Network
      QoS
      to view the QoS Policies page. The
      QoS Policies
      page verifies that QoS is enabled and includes a
      Statistics
      link. Click the Statistics link to view QoS bandwidth, active sessions of a selected QoS node or class, and active applications for the selected QoS node or class.
    • In a multi-vsys environment, sessions cannot span multiple systems. Multiple sessions are created for one traffic flow if the traffic passes through more than one virtual system. To browse sessions running on the firewall and view applied QoS Rules and QoS Classes, select
      Monitor
      Session Browser
      .

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