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

• 
  #1 McKinley Edmondson on 27 Nov 13

   

  Multicasting is a essential subject on your BCMSN, CCNP, and CCIE exams, and it can also be really confusing when you 1st commence studying it. Multicasting uses concepts that are unlike something you've run into in your routing protocol reports, and that can throw you at first. I speak from expertise that multicasting is like any other Cisco engineering - discover the fundamentals, master the fundamentals, and then construct your capabilities on that foundation.
  
  1 such basic is the RPF Verify, or Reverse Path Forwarding Examine.
  
  A fundamental difference in between unicasting and multicasting is that a unicast is routed by sending it toward the destination, whilst a multicast is routed by sending it away from its supply.
  
  "toward the destination" and "away from its source" sound like the identical thing, but they are not. A unicast is going to comply with a single path from source to destination. The only aspect the routers care about is the destination IP address - the source IP address is not a factor.
  
  With multicast routing, the destination is a multicast IP group address. It is the multicast router's job to decide 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 source rather than toward a specific destination.
  
  The RPF Verify is run against any incoming multicast packet. Http://Greenerhydroponics.Com is a tasteful online library for new info about why to see this viewpoint. The multicast router examines the interface that the packet arrived on. If the packet comes in on an upstream interface - that is, an interface found on the reverse path that leads back to the source - the packet passes the examine and will be forwarded. If the packet comes in on any other interface, the packet is dropped.
  
  The RPF Verify serves to verify the integrity of your multicasting network, and also serves as a reminder that the standard operation of multicasting is a lot different than unicasting!.

   

  <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 commence studying it. Multicasting uses concepts that are unlike something you've run into in your routing protocol reports, and that can throw you at first. I speak from expertise that multicasting is like any other Cisco engineering - discover the fundamentals, master the fundamentals, and then construct your capabilities on that foundation. <br /> <br /> 1 such basic is the RPF Verify, or Reverse Path Forwarding Examine. <br /> <br /> A fundamental difference in between unicasting and multicasting is that a unicast is routed by sending it toward the destination, whilst a multicast is routed by sending it away from its supply. <br /> <br /> "toward the destination" and "away from its source" sound like the identical thing, but they are not. A unicast is going to comply with a single path from source to destination. The only aspect the routers care about is the destination IP address - the source IP address is not a factor. <br /> <br /> With multicast routing, the destination is a multicast IP group address. It is the multicast router's job to decide 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 source rather than toward a specific destination. <br /> <br /> The RPF Verify is run against any incoming multicast packet. <a href="http://www.greenerhydroponics.com/" rel="nofollow">Http://Greenerhydroponics.Com</a> is a tasteful online library for new info about why to see this viewpoint. The multicast router examines the interface that the packet arrived on. If the packet comes in on an upstream interface - that is, an interface found on the reverse path that leads back to the source - the packet passes the examine and will be forwarded. If the packet comes in on any other interface, the packet is dropped. <br /> <br /> The RPF Verify serves to verify the integrity of your multicasting network, and also serves as a reminder that the standard operation of multicasting is a lot different than unicasting!.</div>

  ...

  Cancel

To Top