Cisco CCNP Certification BCMSN Exam Tutorial Writing QoS Policy

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Cisco CCNP Certification: BCMSN Exam Tutorial on Writing QoS Policies

Overview:
Quality of Service (QoS) is a critical component of both the BCMSN exam and practical network environments. In this tutorial, we will explore the fundamentals of writing QoS policies, guided by Chris Bryant, CCIE

12933.

What You'll Learn:
At some point in your networking career, you'll need to create and implement QoS policies. Here’s a streamlined process to help you get started:

Three-Step Process for Creating and Applying QoS Policies:

1. Classify the Traffic:
Define a QoS class to identify which traffic will be managed by the policy. This usually involves writing an access list (ACL).

2. Define the Policy Actions:
Develop a QoS policy that specifies the actions to apply to the identified traffic.

3. Apply the Policy:
Implement the QoS policy on the relevant interfaces.

Step-by-Step Guide:

Step 1: Identify the Traffic

To classify traffic, you'll often use an ACL, which can be standard or extended. This ACL is created first and then referenced in a class map.

Example:
```plaintext
SW1(config)

access-list 105 permit tcp any any eq 80

SW1(config)

class-map WEBTRAFFIC

SW1(config-cmap)

match access-group 105

```

Step 2: Write the Policy

Use the `policy-map` command to configure QoS policies. Each clause in the policy defines an action for traffic that matches that clause.

Example:
```plaintext
SW1(config)

policy-map LIMIT_WEBTRAFFIC_BANDWIDTH

SW1(config-pmap)

class WEBTRAFFIC

SW1(config-pmap-c)

police 5000000 exceed-action drop

```
This policy limits web traffic to a specified bandwidth, and any overage will be dropped.

Step 3: Apply the Policy

Attach the policy to the desired interface.

Example:
```plaintext
SW1(config-if)

service-policy LIMIT_WEBTRAFFIC_BANDWIDTH in

```

Final Thoughts

Achieving your CCNP certification can significantly enhance your career, and mastering QoS is a key part of this journey. Start by grasping the fundamentals, and don't let the complexity of QoS deter you. With practice, you'll excel both in exams and in your professional life.

You can find the original non-AI version of this article here: Cisco CCNP Certification BCMSN Exam Tutorial Writing QoS Policy.

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