Cisco CCNA / CCNP Certification Exam Tutorial: ISDN And Multilink PPP
ISDN is a huge topic on both your Cisco CCNA and BCRAN CCNP exams. While many ISDN topics seem straightforward, its the details that make the difference in the exam room and working with ISDN in production networks. Configuring and troubleshooting multilink PPP is just one of the skills youll need to pass both of these demanding exams.
With BRI, we’ve got two B-channels to carry data, and both of them have a 64-kbps capacity. You might think it would be a good idea to have both channels in operation before one reaches capacity, and it is a great idea Problem is, it’s not a default behavior of ISDN. The second b-channel will not begin to carry traffic until the first one reaches capacity.
With Multilink PPP (MLP), a bandwidth capacity can be set that will allow the second b-channel to bear data before the first channel reaches capacity. The configuration for MLP is simple, but often misconfigured. We’ll use our good friend IOS Help to verify the measurement this command uses.
Enabling MLP is a three-step process:
Enable PPP on the link
Enable...
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