8 Replies Latest reply: May 4, 2012 8:52 AM by SUP RSS

    Switching Methods  ?

    SUP

      Switching Methods

      1)Cut-through

      2)Fragment free

      3)Store and forward.

       

      Then what are these.

       

      1) circuit switching

      2) Packet switching
      3) message switching

       

      Is the difference here only LAN and WAN. please differentiate.

       

      If someone asks how many types of switching are there then what should be my answer ?

        • 1. Re: Switching Methods  ?
          CiscoLoco - CCNP

          I wouldnt think of it as LAN vs WAN.  A better way to think of the difference between the two groups is to think of Cut-through, Fragment Free, Store and Foward as the method an individual device uses to foward the frame while Circuit, Packet, and message refers to the method the network as a whole takes to move traffic. 

          • 2. Re: Switching Methods  ?
            SUP

            Scott Morris and Martin what is your answer ?

            • 3. Re: Switching Methods  ?
              ESummers

              In "circuit switching" a circuit, or pathway, must be set up first.  Say one router, R1, is connected to three other routers (Ra, Rb, Rc) across the Internet.  The router sets up a circuit which is defined as the exact pathway (which routers in between) the traffic will take.  When ingress traffic comes to R1, it puts the traffic on that exact pathway to the destination, and the traffic follows the exact pathway (circuit) that was set up.

               

              In packet switching, the pathway is not set up beforehand.  Ingress traffic to R1 is sent to the destination via the next-hop that R1 determines is the best next step.  At the next hop, that router determines the next best step to take to the destination.  For the next packet R1 receives going to the same destination, it MIGHT NOT send it to the same next-hop as it did for the first packet.

               

              Message switching - Not sure.

               

              If someone asks you "how many types of switching are there?", then your answer should be in the form of the question, "What exactly do you mean?"  Without context, the term "switching" is ambiguous.

              • 4. Re: Switching Methods  ?
                Martin

                I agree with guys above;

                plus circuit switching is old phone system or POTS - regular phone lines; old ISDN works that way too;

                 

                Packet Switching is Frame Relay thing.

                 

                Message switching - ? that is new to me;

                • 5. Re: Switching Methods  ?
                  ESummers

                  Glad I wasn't the only one, Martin. 

                   

                  I had to look this up.  My day is complete - I learned something.  Check out p11 of the link for a brief comparison of circuit switched vs packet switched vs message switched.

                   

                  http://web.ccsu.edu/technology/farahmand/ccsu/courses/cet543/resources/ch70_message_swiching.pdf

                  • 6. Re: Switching Methods  ?
                    SUP

                    Guys I was trying to differentiate the above 3 switching methods with below 3 switching methods .

                    Not how  circuit/packet/message swtiching works .

                     

                    I think I am unable to express what i want to know with this question.

                    • 7. Re: Switching Methods  ?
                      ESummers

                      Ah, I think I see what you are asking for now.  Are you asking, if the first three items are category "switching methods", what category would the second three items be?

                       

                      I'll admit that if there is a precise definition, I am not aware of it.  Off the top of my head, given those examples I'd classify the top three (cut-through, store-and-forward...) as "device frame switching methods", and the bottom three as "network switching methods".

                       

                      That's not something that would hold universally, and as stated, is not a precise "dictionary" definition.  Sorry I wasn't able to help further, but hopefully an elmer can step in and educate me. 

                       

                      Best,

                      Ed

                      • 8. Re: Switching Methods  ?
                        SUP

                        HI ESummers

                        now you got my question correct .

                        top three device frame switching methods", and the bottom three as "network switching methods" sounds somewhat convincing but still wait for some better explanation ..