Chapter 42 Configuring PFC QoS

Understanding How PFC QoS Works

Flowchart of Ingress LAN Port PFC QoS Features

Figure 42-5shows how traffic flows through the ingress LAN port PFC QoS features.

Figure 42-5 Ingress LAN Port PFC QoS Features

 

 

Frame

 

 

 

 

 

 

 

enters

 

 

 

 

 

 

 

switch

 

 

 

 

 

 

 

 

 

 

 

 

IP

 

 

ISL or

No

Apply

 

 

traffic with

No

 

 

 

recognizable

 

802.1Q?

 

port

 

 

 

 

 

 

 

ToS byte?

 

 

 

 

CoS

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

Yes

 

Apply

 

 

 

 

 

port

 

 

 

 

 

 

 

 

 

 

 

 

 

CoS

Port set to

Yes

 

 

 

Ignore

 

 

 

 

 

port trust

 

 

untrusted?

 

 

 

 

 

 

 

 

 

 

enabled?

No

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

Port set to

Yes

 

 

 

 

 

 

trust-ipprec?

 

 

 

 

 

 

 

No

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IP

 

 

Port set to

Yes

DSCP-based

 

Yes

traffic with

Yes

DSCP-to-queue

 

recognizable

trust-dscp?

 

queue mapping

 

 

map

 

 

ToS byte?

 

 

 

enabled?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

No

 

 

 

CoS-to-queue

Ingress queues and

 

 

No

 

 

map

 

drop thresholds

Port is set to

 

Ingress

Yes

Mutate

 

 

 

CoS

 

 

 

 

 

 

 

CoS

 

 

trust-cos

 

Mutation?

 

 

 

 

 

 

 

 

 

 

 

154684

 

 

 

 

 

 

 

To

 

 

 

 

 

 

 

PFC

Note

Ingress CoS mutation is supported only on 802.1Q tunnel ports.

Release 12.2(18)SXF5 and later releases support the ignore port trust feature.

DSCP-based queue mapping is supported only on WS-X6708-10GE ports.

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

 

OL-4266-08

42-7

 

 

 

Page 7
Image 7
Cisco Systems OL-4266-08 manual Flowchart of Ingress LAN Port PFC QoS Features, 42-7

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.