Chapter 42 Configuring PFC QoS

Understanding How PFC QoS Works

Figure 42-4 PFC QoS Features and Component Overview

Port Trust

 

- CoS

 

- IP Prec

DSCP

- DSCP

map

- MPLS Exp

 

Identify traffic

 

 

 

based on match

 

 

 

criteria:

 

 

 

- ACL (L2, IP)

 

 

 

- DSCP

Final internal

Scheduler operates

 

- IP Prec

 

DSCP is

 

on WRR, DWRR,

 

- MPLS Exp

 

mapped to CoS

 

SP

 

- Class-map

 

 

 

 

 

 

 

 

 

 

Ingress Port

PFC/DFC

C

l

Egress Port

Incoming

ToS

CoS

Q1

Q2

Scheduler

a

 

 

 

 

 

 

 

 

s

 

 

 

 

 

 

 

 

s

 

 

 

 

 

 

 

 

i

 

 

 

 

 

 

 

 

f

 

 

Policy

 

 

Result

 

i

 

 

 

 

 

 

 

c

 

 

 

 

 

 

 

 

a

 

 

 

 

 

 

 

 

t

 

 

 

 

 

 

 

 

i

 

 

 

 

 

 

 

 

o

 

 

 

 

 

 

 

 

n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DSCPCoS

rewrite

CoS determies queue selection

Q1

 

SP

 

Q2

 

Outgoing

 

 

 

 

 

 

 

 

WRR

 

 

 

 

 

 

 

 

 

 

 

Q3

 

DWRR CoS set on

 

 

 

trunk port

Q4

 

DSCP set

 

for IP

 

 

Scheduling rules: WRR, PQ

Queueing based on CoS

Action - policy map

Trust - DSCP, IP Prec MPLS Exp

Mark - set internal

DSCP

Police - rate limit; mark; drop

Scheduler queue and threshold are configurable

137031

Component Overview

These sections provide more detail about the role of the following components in PFC QoS decisions and processes:

•Ingress LAN Port PFC QoS Features, page 42-6

•PFC and DFC QoS Features, page 42-8

•PFC QoS Egress Port Features, page 42-12

Ingress LAN Port PFC QoS Features

These sections provide an overview of the ingress port QoS features:

•Flowchart of Ingress LAN Port PFC QoS Features, page 42-7

•Port Trust, page 42-8

•Ingress Congestion Avoidance, page 42-8

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

42-6

OL-4266-08

 

 

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Cisco Systems OL-4266-08 manual Component Overview, Ingress LAN Port PFC QoS Features, 42-6
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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.

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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.

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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.
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