Overview of Policers, 42-19 | Cisco Systems OL-4266-08 guide

Chapter 42 Configuring PFC QoS

Understanding How PFC QoS Works

Classification and Marking on the MSFC

PFC QoS sends IP traffic to the MSFC with the final internal DSCP values. CoS is equal to

IP precedence in all traffic sent from the MSFC to egress ports.

Figure 42-9 Marking with PFC2 or PFC3 and MSFC2, MSFC2A, or MSFC3

From PFC

Multilayer Switch Feature Card (MSFC) marking

IP traffic	Yes	Write ToS
from PFC?		byte into
		packet
No
Route
traffic
		144800

CoS = IP precedence for all traffic (not configurable)

To egress

port

Note Traffic that is Layer 3 switched on the PFC does not go through the MSFC and retains the CoS value assigned by the PFC.

Policers

These sections describe policers:

•Overview of Policers, page 42-19

•Aggregate Policers, page 42-20

•Microflow Policers, page 42-21

Overview of Policers

Policing allows you to rate limit incoming and outgoing traffic so that it adheres to the traffic forwarding rules defined by the QoS configuration. Sometimes these configured rules for how traffic should be forwarded through the system are referred to as a contract. If the traffic does not adhere to this contract, it is marked down to a lower DSCP value or dropped.

Policing does not buffer out-of-profile packets. As a result, policing does not affect transmission delay. In contrast, traffic shaping works by buffering out-of-profile traffic, which moderates the traffic bursts. (PFC QoS does not support shaping.)

Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

	OL-4266-08	42-19

OL-4266-08 specifications

Cisco Systems OL-4266-08 is a robust and versatile certification that focuses on the essentials of implementing and troubleshooting Cisco collaborations solutions. As enterprises increasingly rely on unified communications, having professionals who are knowledgeable in the latest Cisco technologies becomes a necessity. This certification is part of the Cisco Certified Network Associate (CCNA) program, which serves as a foundational stepping stone for individuals aspiring to build a career in networking and collaboration technologies.

One of the main features of OL-4266-08 is its emphasis on collaboration foundations, which includes an understanding of voice, video, messaging, and conferencing technologies. Professionals who obtain this certification demonstrate proficiency in deploying, configuring, and troubleshooting Cisco collaboration solutions like Cisco Unified Communications Manager and Cisco Webex. This knowledge is critical as businesses seek to enhance communication and productivity through integrated systems.

Technologically, OL-4266-08 covers a wide array of essential concepts, including IP telephony, voicemail, and collaborative tools. Candidates learn about the architecture of unified collaboration systems, involving integration with routing and switching networks. Additionally, it delves into security protocols to ensure secure transmissions of voice and video data, thereby protecting sensitive corporate communication.

In terms of characteristics, OL-4266-08 is designed to be both comprehensive and practical. The certification emphasizes hands-on experience, which is essential for understanding real-world applications of Cisco technologies. The coursework provides extensive exposure to simulations and labs that mimic actual network environments. This hands-on approach enables candidates to troubleshoot issues effectively using Cisco's troubleshooting tools and methodologies.

Moreover, the certification aligns with industry standards, ensuring that individuals gain relevant and in-demand skills. Given the evolving landscape of network technologies, OL-4266-08 prepares individuals for future growth and specialization in various areas, including cloud collaboration and Internet of Things (IoT) communications.

In conclusion, Cisco Systems OL-4266-08 equips networking professionals with the necessary skills to implement and support Cisco collaboration solutions. The focus on hands-on experience, along with in-depth coverage of technology and security protocols, makes it a valuable certification in the fast-paced world of network communications. With the rise of remote work and digital collaboration, this certification is pivotal for anyone looking to enhance their career in networking and technology.

Cisco Systems OL-4266-08 Classification and Marking on the Msfc, Overview of Policers, 42-19

Models: OL-4266-08