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Cisco CCNA Certification Training Tutorial: PPP Multilink And ISDN BRI Computers Articles | November 27 Dru Samia Shirt , 2006

PPP Multilink seems simple enough, but there are details you have to master in order to become CCNA certified! Learn these important details from Chris Bryant, CCIE #12933.



Earning your CCNA certification means you have to notice details about Cisco routers that others might miss Alexander Mattison Shirt , and that's true in the exam room and on the job. In today's tutorial, we'll take a look at multilink PPP - a topic that seems simple enough, but has details that trip up some CCNA certification candidates.


ISDN BRI (Basic Rate Interface) has two B-channels that both carry data Irv Smith Jr. Shirt , and they each have a capacity of 64 KBPS. Interestingly enough, they don't share the load by default - the first channel has to be at capacity before the second channel starts taking some of the load. It's more efficient to have the channels share the load before then, and we can do just that by configuring PPP multilink. (Note that it's called PPP multilink for a reason. We can't configure it if the BRI interface is running at the default of HDLC.)


Configuring PPP multilink is simple enough. PPP must be running on the interface to begin with Garrett Bradbury Shirt , and then you simply configure the interface with the "PPP multilink" command.


R1(config)#int bri0


R1(config-if)#encapsulation ppp


R1(config-if)#ppp multilink


Here's where knowing the details comes in handy. An additional command, "dialer load-threshold", is needed to define the capacity level of the first b-channel that will bring up the second b-channel. For example Danielle Hunter Jersey , let's say we want the second channel to come up when the first channel hits 50% of its capacity. It's easy to think that we would put "50" at the end of the dialer load-threshold command, but that's wrong! Look at what IOS Help tells us about this command.


R1(config-if)#dialer load-threshold ?


Load threshold to place another call


This value is based on 255, not 100. To bring the second channel up as described earlier Eric Kendricks Jersey , we need to enter a value that is 50% of 255:


R1(config-if)#dialer load-threshold 127


The dialer load-threshold command has other options not shown here. The interface can be configured to consider only incoming or outgoing traffic for this command, or both.


This is just one of the many details you must master in order to earn your CCNA certification. Take it from me - it's worth it. Keep studying!

Article Tags: Ccna Certification, Second Channel Trae Waynes Jersey , Dialer Load-threshold

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