Cisco CCNP / BCMSN Exam Tutorial: Multicasting Plus the RPF Check
Multicasting is a significant matter on the BCMSN, CCNP, and CCIE examinations, and it can also be incredibly perplexing after you 1st start out learning it. Multicasting works by using principles 스포츠토토사이트 which have been in contrast to anything you’ve operate into inside your routing protocol reports, and that can toss you initially. I speak from practical experience that multicasting is like any other Cisco technology – master the basics, grasp the fundamentals, after which Make your expertise on that Basis.
One this sort of fundamental is the RPF Test, or Reverse Path Forwarding Examine.
A essential distinction between unicasting and multicasting is always that a unicast is routed by sending it toward the location, even though a multicast is routed by sending it faraway from its supply.
“towards the desired destination” and “faraway from its supply” audio such as the very same issue, but they’re not. A unicast is going to abide by only one path from supply to destination. The sole issue the routers care about is definitely the desired destination IP tackle – the resource IP handle isn’t a factor.
With multicast routing, the location is often a multicast IP team tackle. It’s the multicast router’s task to choose which paths will guide back again towards the supply (upstream) and which paths are downstream with the supply. Reverse Route Forwarding refers to the router’s actions of sending multicast packets from the supply in lieu of towards a selected place.
The RPF Check out is run towards any incoming multicast packet. The multicast router examines the interface the packet arrived on. If the packet http://edition.cnn.com/search/?text=토토사이트 is available in on an upstream interface – that may be, an interface located to the reverse route that potential customers back towards the source – the packet passes the Look at and can be forwarded. If your packet comes in on almost every other interface, the packet is dropped.
The RPF Examine serves to confirm the integrity of the multicasting community, and likewise serves being a reminder that The fundamental operation of multicasting is a whole lot various than unicasting!