Chapter 42 Configuring PFC QoS

Configuring PFC QoS

When configuring a per-interface policer, note the following information:

•Aggregate policing works independently on each DFC-equipped switching module and independently on the PFC, which supports any non-DFC-equipped switching modules. Aggregate policing does not combine flow statistics from different DFC-equipped switching modules. You can display aggregate policing statistics for each DFC-equipped switching module and for the PFC and any non-DFC-equipped switching modules supported by the PFC.

•Each PFC or DFC polices independently, which might affect QoS features being applied to traffic that is distributed across the PFC and any DFCs. Examples of these QoS feature are:

–Policers applied to a port channel interface.

–Policers applied to a switched virtual interface.

–Egress policers applied to either a Layer 3 interface or an SVI. Note that PFC QoS performs egress policing decisions at the ingress interface, on the PFC or ingress DFC.

Policers affected by this restriction deliver an aggregate rate that is the sum of all the independent policing rates.

•With a PFC3, when you apply both ingress policing and egress policing to the same traffic, both the input policy and the output policy must either mark down traffic or drop traffic. PFC QoS does not support ingress markdown with egress drop or ingress drop with egress markdown.

•With Release 12.2(18)SXE and later releases, you can apply aggregate and microflow policers to IPv6 traffic.

•With a PFC3, policing uses the Layer 2 frame size.

•With a PFC2, policing uses the Layer 3 packet size.

•See the “PFC QoS Configuration Guidelines and Restrictions” section on page 42-49for information about rate and burst size granularity.

•You can enter the flow keyword to define a microflow policer (you cannot apply microflow policing to ARP traffic). When configuring a microflow policer, note the following information:

–With a PFC3, you can enter the mask src-onlykeywords to base flow identification only on source addresses, which applies the microflow policer to all traffic from each source address. Release 12.2(17d)SXB and later releases support the mask src-onlykeywords for both IP traffic and MAC traffic. Releases earlier than Release 12.2(17d)SXB support the mask src-onlykeywords only for IP traffic.

–With a PFC3, you can enter the mask dest-onlykeywords to base flow identification only on destination addresses, which applies the microflow policer to all traffic to each source address. Release 12.2(17d)SXB and later releases support the mask dest-onlykeywords for both IP traffic and MAC traffic. Releases earlier than Release 12.2(17d)SXB support the mask dest-onlykeywords only for IP traffic.

–By default and with the mask full-flowkeywords, PFC QoS bases IP flow identification on source IP address, destination IP address, the Layer 3 protocol, and Layer 4 port numbers.

–With a PFC2, PFC QoS considers IPX traffic with same source network, destination network, and destination node to be part of the same flow, including traffic with different source nodes or sockets.

–PFC QoS considers MAC-Layer traffic with the same protocol and the same source and destination MAC-Layer addresses to be part of the same flow, including traffic with different EtherTypes.

–Microflow policers do not support the maximum_burst_bytes parameter, the pir bits_per_second keyword and parameter, or the violate-actionkeyword.

 

 

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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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