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sib2017
L4 Transporter

Qos profile

traffice.JPG

 

Hi ,

 

In the above  which class will get high priority ?

 

Thanks

BPry
Cyber Elite

@sib2017 The priority is listed in the far right  column. Class 2 traffic being real-time will be given the highest priority and everything but class4 is being assigned high priority. Keep in mind that everything by default is class4 on the PA., you need to enable QoS on the interface level, and it looks like whoever setup the Maximum egress didn't really care about anything but the default class4 traffic. 

 

I would look at some of the QoS articles on live; most of them do a really good job of explaining things but setting up QoS on the PA can be seen as weird from someone used to primarly working with switches and routers. 

sib2017
L4 Transporter

Hi,

Thank you for the reply , I am using  class 2 for  skype and skype probe , the issue is  sometimes the audio is lagging  than video

 

Thanks

 

sib2017
L4 Transporter

Hi,

Is it necessary to mark qos in the switch level ( from the access layer or distribution layer ), if we are enabling  qos on PA ?.

 

pa will mark  qos on the packet if we are sennding to the upstream router ?

Thanks

 

reaper
L7 Applicator

Hi @sib2017

 

the PANW QoS is going to apply limits/make reservations and prioritize sessions on the system but will not mark packets

 

marking is supported on the security policies, but then an external device becomes responsible for enforcing QoS:

qos marking.png

 

if you want to prevent the audio/video from lagging, it may also be a good idea to set a reservation for bandwidth, so you don't run out.

even with the priority set to realtime (which will assign top priority queueing in a dedicated queue) there may still be a bandwidth issue preventing you from achieving lossless audio/video

Tom Piens - PANgurus.com
Like my answer? check out my book! amazon.com/dp/1789956374
sib2017
L4 Transporter

 

 

Hi reaper ,


Usually the enforcing device must be the upstream device ( router or firewall ) ? .

I have deployed pa in vw mode. my upstream device is asa fw and then router

Thanks

 

reaper
L7 Applicator

if you use the 'QoS marking' option, then yes, an upstream device needs to do the shaping

 

if you configure QoS on the PANW, it will apply shaping just fine and you wont need external devices

Tom Piens - PANgurus.com
Like my answer? check out my book! amazon.com/dp/1789956374
sib2017
L4 Transporter

Hi,

If we configure the qos on PANOS and the packet reached on upstream asa or router , How the asa will treat this packet if there is no qos related service enabled ( policy )

Thanks

reaper
L7 Applicator

sensing much confusion, I am

 

 

;)

 

ok ok lemme start fresh

 

 

1) there are QoS policies and QoS profiled on the panw firewall which allow you to set maximum throughput or guaranteed throughput for certain classes of traffic. you can also set a priority which, in case the firewall is starved for resources (high DP load) can prioritize the IO of certain sessions. all this is achieved on the firewall without the outside being aware something is being limited or prioritized

 

2) QoS marking through a security policy: the firewall adds a QoS 'color' to the packets in a session (DSCP codepoint, like a flag in tcp header) so external devices can pick up on these colored packets (upstream loadbalancers or other firewalls/routers) and prioritize/deprioritize based on the 'color' of the packet, IF they understand DSCP codepoints

Tom Piens - PANgurus.com
Like my answer? check out my book! amazon.com/dp/1789956374
BPry
Cyber Elite

@sib2017 if you're putting the time and effort to do QOS mappings on your ASA and PA then you really should enable it on the access layer. When setting up QOS you pretty much want to have it on the full stream if possible, but usually most people would do QOS on the access and distribution layer and then would have the firewall scaled to the point they don't have to worry about doing QOS on it as much, as most ISPs won't listen to DSCP codepoints. 

 

I would really recommend that you work on creating QOS statements on your access layer before you worry to much about working with QOS on your firewall unless your dataplane is constantly starved for resources. It is far more likely that the access or distribution layer is dropping packets in the queue than your firewall dropping them, unless of course your ASA or PA is not scaled for your network properly. 

 

Also yes if you have the PA set to do DSCP codepoints you also need to tell your ASA what to do with them so that it prioritizes things properly. It's important to note that QOS simply tells the device how it should be processing the traffic; so if the traffic can all be processed almost instantly and not build up in the queue then you really never take advantage of your QOS statements, but if the queue starts to fill up then the device uses the QOS statements to know what you want to prioritize and actually process first, second, third, and so on. 

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