Speed Issue due to QoS

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Speed Issue due to QoS

L4 Transporter



I am experiencing speed issues that I believe may be related to the current QoS configuration on my PA-3020 firewall. I currently have 2 different QoS classes defined: Class 1 & 2. I have three applications under class 1, and one application under class 2. However, under the QoS profile assigned to my outbound internet links, I have an additional 2 classes defined. I have class 4 assigned with a guaranteed egress of 250mbps, and class 5 with a guaranteed egress of 49mbps.

I am wondering if these 2 additional classes still have bandwidth set aside for them (250mbps & 49mbps), despite the fact that there are no applications defined as class 4 or 5.

PAN-OS is 8.0.9


Thanks in advance.


Cyber Elite
Cyber Elite

Hi @Farzana


  • What internet connection do you have?
  • What guaranteed and max bandwidth did you configure for class 1, 2 and 4? (Class 5 will not be used if you did not configure a QoS policy for this class)
  • Where do you have this speed issues: Upload and/or download?
  • How did you configure the interface QoS?

(If possible it would probably be easier if you share screenshots of your QoS policy, QoS profile and the interface QoS configuration)

Hi @vsys_remo,


Thank you for your response.


  1. We have two 400mb internet connections which are load balanced using ECMP on the PA-3020.
  2. We have 80mb configured for class 1 on our QoS profile for the outbound internet links.  We have 200mb configured for class 1 on our WAN connections.  There are also class 4 & 5 configured, but no QoS policies exist for these.
  3. Our speed issue is from our remote sites connected through our ISP MPLS (coming in on our WAN link).  There are many factors involved in this solution, so I’m just trying to rule out QoS as a potential cause.
  4. Screenshots are below.

QoS PolicyQoS PolicyQoS InterfacesQoS InterfacesQoS ProfileQoS Profile

Hi @Farzana


What speed issues do you have exactly? Could you explain a little more? Are these issues constantly, randomly, mostly at specific times or only on weekdays or als on the weekend?


What I see in your screenshots is that you don't really have a bandwidth limitation for incoming traffic configured. So theoretically 1 user (connected with Gbit) could utilize the full bandwidth on both ISP links with 2 big downloads.


QoS on Paloalto firewalls is only applied on egress interface. So even a user connects to Microsoft for downloading updates (your QoS policy 3), the big data transfer is incoming and not outgoing, the most of the traffic will be handled by the QoS interface config for ethernet1/3 and there the only limit is 1 Gbit (except if there is a lot of skype traffic than the update download can only consume up to 800 Mbit)

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