Chapter 42 Configuring PFC QoS

Configuring PFC QoS

Note The flowmask requirements of microflow policing, NetFlow, and NetFlow data export (NDE) might conflict.

•The valid range of values for the CIR bits_per_second parameter is as follows:

–Minimum—32 kilobits per second, entered as 32000

–Maximum with Release 12.2(18)SXE and later releases:

10 gigabits per second, entered as 10000000000

–Maximum with releases earlier than Release 12.2(18)SXE:

4 gigabits per second, entered as 4000000000

•The normal_burst_bytes parameter sets the CIR token bucket size.

•The maximum_burst_bytes parameter sets the PIR token bucket size (not supported with the flow keyword)

•When configuring the size of a token bucket, note the following information:

–The minimum token bucket size is 1 kilobyte, entered as 1000 (the maximum_burst_bytes parameter must be set larger than the normal_burst_bytes parameter)

–The maximum token bucket size is 32 megabytes, entered as 32000000

–To sustain a specific rate, set the token bucket size to be at least the rate value divided by 4000, because tokens are removed from the bucket every 1/4000th of a second (0.25 ms).

–Because the token bucket must be large enough to hold at least one frame, set the parameter larger than the maximum size of the traffic being policed.

–For TCP traffic, configure the token bucket size as a multiple of the TCP window size, with a minimum value at least twice as large as the maximum size of the traffic being policed.

•(Not supported with the flow keyword.) The valid range of values for the pir bits_per_second parameter is as follows:

–Minimum—32 kilobits per second, entered as 32000 (the value cannot be smaller than the CIR bits_per_second parameters)

–Maximum with Release 12.2(18)SXE and later releases:

10 gigabits per second, entered as 10000000000

–Maximum with releases earlier than Release 12.2(18)SXE:

4 gigabits per second, entered as 4000000000

•(Optional) You can specify a conform action for matched in-profile traffic as follows:

–The default conform action is transmit, which sets the policy map class trust state to trust DSCP unless the policy map class contains a trust command.

–To set PFC QoS labels in untrusted traffic, you can enter the set-dscp-transmitkeyword to mark matched untrusted traffic with a new DSCP value or enter the set-prec-transmitkeyword to mark matched untrusted traffic with a new IP precedence value. The set-dscp-transmitand set-prec-transmitkeywords are only supported for IP traffic. PFC QoS sets egress ToS and CoS from the configured value.

–You can enter the drop keyword to drop all matched traffic.

–Ensure that aggregate and microflow policers that are applied to the same traffic each specify the same conform-action behavior.

 

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OL-4266-08

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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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