Chapter 42 Configuring PFC QoS

Configuring PFC QoS

•The mls qos trust cos command enables CoS-based receive-queue drop thresholds. To avoid dropping traffic because of inconsistent CoS values, configure ports with the mls qos trust cos command only when the received traffic is ISL or 802.1Q frames carrying CoS values that you know to be consistent with network policy.

•With Release 12.2(17b)SXA and later releases, you can configure IEEE 8021.Q tunnel ports configured with the mls qos trust cos command to use a mutated CoS value instead of the received CoS value (“Configuring Ingress CoS Mutation on IEEE 802.1Q Tunnel Ports” section on

page 42-83).

•Use the no mls qos trust command to set the port state to untrusted.

This example shows how to configure Gigabit Ethernet port 1/1 with the trust cos keywords:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# interface gigabitethernet 1/1

Router(config-if)# mls qos trust cos

Router(config-if)# end

Router#

This example shows how to verify the configuration:

Router# show queueing interface gigabitethernet 1/1 include trust

Trust state: trust COS

Router#

Configuring the Ingress LAN Port CoS Value

Note Whether or not PFC QoS uses the CoS value applied with the mls qos cos command depends on the trust state of the port and the trust state of the traffic received through the port. The mls qos cos command does not configure the trust state of the port or the trust state of the traffic received through the port.

To use the CoS value applied with the mls qos cos command as the basis of internal DSCP:

•On a port that receives only untagged ingress traffic, configure the ingress port as trusted or configure a trust CoS policy map that matches the ingress traffic.

•On a port that receives tagged ingress traffic, configure a trust CoS policy map that matches the ingress traffic.

You can configure the CoS value that PFC QoS assigns to untagged frames from ingress LAN ports configured as trusted and to all frames from ingress LAN ports configured as untrusted.

 

 

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Cisco Systems OL-4266-08 manual Configuring the Ingress LAN Port CoS Value, 42-91
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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.

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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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