Cisco CCNP / BCMSN Exam Tutorial: Multicasting And The RPF Verify - 0 views

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  #1 Dyer Link on 21 Dec 13

   

  Multicasting is a essential subject on your BCMSN, CCNP, and CCIE exams, and it can also be really confusing when you 1st begin studying it. Multicasting uses concepts that are unlike anything you've run into in your routing protocol studies, and that can throw you at 1st. I speak from encounter that multicasting is like any other Cisco engineering - learn the fundamentals, master the fundamentals, and then develop your abilities on that foundation.
  
  1 such fundamental is the RPF Check, or Reverse Path Forwarding Examine.
  
  A fundamental difference amongst unicasting and multicasting is that a unicast is routed by sending it toward the destination, even though a multicast is routed by sending it away from its source.
  
  "toward the destination" and "away from its supply" sound like the identical factor, but they are not. A unicast is going to adhere to a single path from supply to destination. The only aspect the routers care about is the destination IP address - the supply IP address is not a aspect.
  
  With multicast routing, the destination is a multicast IP group address. It's the multicast router's job to make a decision which paths will lead back to the supply (upstream) and which paths are downstream from the source. Reverse Path Forwarding refers to the router's behavior of sending multicast packets away from the supply rather than toward a particular destination.
  
  The RPF Examine is run against any incoming multicast packet. The multicast router examines the interface that the packet arrived on. If the packet comes in on an upstream interface - that is, an interface located on the reverse path that leads back to the source - the packet passes the check and will be forwarded. If the packet comes in on any other interface, the packet is dropped.
  
  The RPF Examine serves to verify the integrity of your multicasting network, and also serves as a reminder that the fundamental operation of multicasting is a lot diverse than unicasting!. Http://Greenerhydroponics.Com contains more about why to engage in it.

   

  <div class="cArrow"> </div><div class="cContentInner">Multicasting is a essential subject on your BCMSN, CCNP, and CCIE exams, and it can also be really confusing when you 1st begin studying it. Multicasting uses concepts that are unlike anything you've run into in your routing protocol studies, and that can throw you at 1st. I speak from encounter that multicasting is like any other Cisco engineering - learn the fundamentals, master the fundamentals, and then develop your abilities on that foundation. <br /> <br /> 1 such fundamental is the RPF Check, or Reverse Path Forwarding Examine. <br /> <br /> A fundamental difference amongst unicasting and multicasting is that a unicast is routed by sending it toward the destination, even though a multicast is routed by sending it away from its source. <br /> <br /> "toward the destination" and "away from its supply" sound like the identical factor, but they are not. A unicast is going to adhere to a single path from supply to destination. The only aspect the routers care about is the destination IP address - the supply IP address is not a aspect. <br /> <br /> With multicast routing, the destination is a multicast IP group address. It's the multicast router's job to make a decision which paths will lead back to the supply (upstream) and which paths are downstream from the source. Reverse Path Forwarding refers to the router's behavior of sending multicast packets away from the supply rather than toward a particular destination. <br /> <br /> The RPF Examine is run against any incoming multicast packet. The multicast router examines the interface that the packet arrived on. If the packet comes in on an upstream interface - that is, an interface located on the reverse path that leads back to the source - the packet passes the check and will be forwarded. If the packet comes in on any other interface, the packet is dropped. <br /> <br /> The RPF Examine serves to verify the integrity of your multicasting network, and also serves as a reminder that the fundamental operation of multicasting is a lot diverse than unicasting!. <a rel="nofollow" href="http://www.greenerhydroponics.com/">Http://Greenerhydroponics.Com</a> contains more about why to engage in it.</div>

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