Chapter 42 Configuring PFC QoS

Configuring PFC QoS

Configuring DSCP Transparency

Note • In addition to support for other IP traffic, the PFC3B and PFC3BXL support the no mls qos rewrite ip dscp command for MPLS traffic, traffic in IP in IP tunnels, and traffic in GRE tunnels.

•The PFC3A supports the no mls qos rewrite ip dscp command for all IP traffic except MPLS traffic, traffic in IP in IP tunnels, and traffic in GRE tunnels.

To enable DSCP transparency, which preserves the received Layer 3 ToS byte, perform this task:

 

Command

 

 

Purpose

Step 1

 

 

 

 

Router(config)# no mls

qos rewrite

ip dscp

Disables egress ToS-byte rewrite globally on the router.

 

Router(config)# mls qos rewrite ip

dscp

Enables egress ToS-byte rewrite globally on the router.

Step 2

 

 

 

 

Router(config)# end

 

 

Exits configuration mode.

Step 3

 

 

 

Router# show mls qos

include rewrite

Verifies the configuration.

 

 

 

 

 

When you preserve the received Layer 3 ToS byte, QoS uses the marked or marked-down CoS value for egress queueing and in egress tagged traffic.

This example shows how to preserve the received Layer 3 ToS byte and verify the configuration:

Router# configure terminal

Router(config)# no mls qos rewrite ip dscp

Router(config)# end

Router# show mls qos include rewrite

QoS ip packet dscp rewrite disabled globally

Router#

Enabling Queueing-Only Mode

To enable queueing-only mode on the router, perform this task:

 

Command

Purpose

Step 1

 

 

Router(config)# mls qos queueing-only

Enables queueing-only mode on the router.

 

Router(config)# no mls qos queueing-only

Disables PFC QoS globally on the router.

 

 

Note You cannot disable queueing-only mode

 

 

separately.

Step 2

 

 

Router(config)# end

Exits configuration mode.

Step 3

 

 

Router# show mls qos

Verifies the configuration.

 

 

 

When you enable queueing-only mode, the router does the following:

•Disables marking and policing globally

•Configures all ports to trust Layer 2 CoS

 

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

42-58

OL-4266-08

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Cisco Systems OL-4266-08 manual Configuring Dscp Transparency, Enabling Queueing-Only Mode, 42-58
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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.

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.
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