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New User
Posts: 2
Registered: ‎05-15-2017
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Basic Qos JSeries

                   I would like help from friends to clarify some details about the architecture and configuration of QoS in Junos for JSeries. We have some J2320 model equipment and would like to better understand the configuration applied to QoS compared to Cisco IOS that I am already more accustomed to.       

 

                    In short, what I needed to understand is how policies and queues are correctly applied and enforced; What is the recommended direction (WAN / LAN) to apply the "scheduler-map", "sdcp" and "rewrite-rules" commands?

 

                      It would help if they could explain in an initial way for me to move on, because the material prepared by the manufacturer confuses a lot of times.

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Distinguished Expert
Posts: 5,111
Registered: ‎03-30-2009
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Re: Basic Qos JSeries

Have you seen Junos QoS for IOS engineers?

 

http://forums.juniper.net/t5/Day-One-Books/Day-One-Junos-QoS-for-IOS-Engineers/ba-p/172020

Steve Puluka BSEET
Juniper Ambassador
Senior IP Engineer - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
JNCIA-Junos JNCIS-SEC JNCIP-SEC JNCSP-SEC
JNCIS-FWV
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JNCIS-SP
ACE PanOS 6 ACE PanOS 7
http://puluka.com/home
New User
Posts: 2
Registered: ‎05-15-2017
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Re: Basic Qos JSeries

     

        Thanks Steve, the document helped a lot. One thing I took to understand this was the difference between "classifiers dscp" and "rewrite-rules", and from what I understood the classifiers uses the markup to decide which forwarding-class and loss priority to apply, whereas in rewrite-rules it is checked which Forward-class and loss-priority of the match to be marked with the defined code. Am I right ?

 

          Another question is if when I apply a "family inet filter input" in an interface with the rule having the condition "then forwarding-class" and "loss-priority" applied, this will already direct traffic to the queue if it matches the Rule?

 

Sérgio Pontes

Distinguished Expert
Posts: 5,111
Registered: ‎03-30-2009
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Re: Basic Qos JSeries

I found this graphic helpful.  Basically the classifiers feed the schedulers using the input filters.

 

http://www.juniper.net/assets/us/en/local/pdf/books/day-one-poster-junos-cos.pdf

Steve Puluka BSEET
Juniper Ambassador
Senior IP Engineer - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
JNCIA-Junos JNCIS-SEC JNCIP-SEC JNCSP-SEC
JNCIS-FWV
JNCDA JNCDS-DC JNCDS-SEC
JNCIS-SP
ACE PanOS 6 ACE PanOS 7
http://puluka.com/home