Cisco CCNA CCNP Certification Exam Tutorial ISDN And Multilink PPP

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Cisco CCNA / CCNP Certification Exam Guide: ISDN and Multilink PPP


Introduction

Mastering ISDN is crucial for success in the Cisco CCNA and BCRAN CCNP exams. A key component you’ll need to understand is Multilink PPP. Here's a detailed look at what you need to know, brought to you by Chris Bryant, CCIE

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Understanding ISDN and Multilink PPP


The Importance of ISDN

ISDN plays a significant role in both the CCNA and BCRAN CCNP exams. Although some aspects of ISDN may seem straightforward, it's the finer details that are vital for the exam and practical network implementation.

The Role of BRI

In BRI, there are two B-channels, each with a capacity of 64 kbps. Ideally, both channels should operate before one is fully utilized, but ISDN doesn’t enable this by default. The second B-channel starts only when the first reaches full capacity.

Leveraging Multilink PPP

Multilink PPP (MLP) allows you to set a bandwidth threshold so that the second B-channel can carry data before the first one is fully utilized. While the configuration process for MLP is straightforward, it is often misconfigured. Using IOS Help can ensure accurate command input.

Steps to Enable MLP


1. Enable PPP on the Link
2. Enable MLP using the command `ppp multilink`
3. Set the Threshold with the `dialer load-threshold` command, specifying when the second B-channel should activate.

Example Configuration

To activate the second B-channel at 75% capacity, multiply the percentage (in decimal form) by 255. For 75%, calculate: 255 x 0.75 = 191.

```plaintext
R1(config)

int bri0

R1(config-if)

ppp multilink

R1(config-if)

dialer load-threshold 191

either Threshold decision based on max of inbound and outbound traffic
```

The IOS Help shows options for `dialer load-threshold`, allowing configuration to account for inbound, outbound, or all traffic.

Conclusion

Configuring Multilink PPP is just one of many skills needed to achieve CCNA certification and pass the CCNP BCRAN exam. Understanding and correctly implementing ISDN is crucial for success in Cisco’s certification process. Don’t underestimate its importance!

You can find the original non-AI version of this article here: Cisco CCNA CCNP Certification Exam Tutorial ISDN And Multilink PPP.

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