5 Replies Latest reply on May 12, 2014 10:10 AM by david

    QoS Mapping - Map Number Priority

    tec-clec New Member


      I understand that QoS Maps are processed by lowered numbered maps will be checked and processed first.

       

      My question is: Are the QoS maps processed lower to higher per interface,  or lower to higher on all map numbers in the config?

       

      What happens if you have 2 with the same number?

       

        • Re: QoS Mapping - Map Number Priority
          ninjaneer New Member

          I was doing some research on this subject and found this thread QoS - Bandwidth Guaranteed? It does answer the question on the number sequence. They are processed Lower to higher. I have not seen anything posted on having duplicate entries.

            • Re: QoS Mapping - Map Number Priority
              ujjvalkoul New Member

              Lets bring up with brian

               

              Call him

               

              Ujjval K

                • Re: QoS Mapping - Map Number Priority
                  cj! Beta_User

                  You can have more than one QoS map, each with multiple sequence numbers.  You may use the same sequence numbers in each of your maps if you like.  Example:

                   

                  !

                  qos map ExampleA 10

                    match dscp 46

                    priority 120

                  qos map ExampleA 20

                    match dscp 40

                    priority 96

                  !

                  qos map ExampleB 10

                    match dscp 46

                    priority 128

                  qos map ExampleB 20

                    match dscp 32

                    priority 128

                  qos map ExampleB 30

                    match dscp 20

                    priority 256

                  !

                   

                  Then you would assign the QoS maps to interfaces.  An interface can use only one QoS map (either qos-policy out ExampleA or qos-policy out ExampleB in this example) .  The same QoS map can be used by more than one interface, or different interfaces can use different QoS maps.  Within each interface/map, traffic will be prioritized as you described, with lowest sequence number being processed first.  Here's what interfaces might look like:

                   

                  !

                  interface eth 0/1

                    description MPLS

                    ip address  172.16.2.1  255.255.255.0

                    ip access-policy Private

                    traffic-shape rate 3000000

                    qos-policy out ExampleA

                    no shutdown

                  !

                  !

                  interface eth 0/2

                    description ISP

                    ip address  1.2.3.4  255.255.255.0

                    ip access-policy Public

                    traffic-shape rate 5000000

                    qos-policy out ExampleB

                    no shutdown

                  !

                   

                  Note that cases where your WAN speed is less than the physical interface link speed (e.g., a 3 Mbps MPLS router hands off via a 100 Mbps Fast Ethernet link), you need to assign a traffic-shaping rate to your IP interface that informs the ADTRAN unit when prioritization should occur.  Without this parameter, it will consider the physical link speed (100 Mbps) the actual usable speed on the interface.

                   

                  The guides Configuring QoS in AOS and Configuring an efficient QoS Map provide excellent information about QoS in AOS, best practices and GUI/CLI configuration examples!

                   

                  Best,

                  CJ

                  1 of 1 people found this helpful
              • Re: QoS Mapping - Map Number Priority
                jayh Hall_of_Fame

                The maps are in order low to high per map.  Each map is typically applied to one interface but if applied to more than one, they are evaluated per interface.  Duplicate numbers in different maps are not an issue and won't cause problems.

                1 of 1 people found this helpful
                • Re: QoS Mapping - Map Number Priority
                  david Employee

                  Tec-clec,

                   

                  I went ahead and marked a couple of Helpful Answers on this post so that others who search the forum might see them.  If you have further questions, feel free to post them here and I'll be happy to assist however I can.

                   

                  Thanks,

                  David