Chapter 42 Configuring PFC QoS

PFC QoS Configuration Guidelines and Restrictions

•The QoS features implemented in the port ASICs (queue architecture and dequeuing algorithms) support IPv4 and IPv6 traffic.

•The PFC3 supports IPv6 named extended ACLs and named standard ACLs.

•In Release 12.2(18)SXE and later releases, the PFC3 supports the match protocol ipv6 command.

•Because of conflicting TCAM lookup flow key bit requirements, you cannot configure IPv6 DSCP-based filtering and IPv6 Layer 4 range-based filtering on the same interface. For example:

–If you configure both a DSCP value and a Layer 4 “greater than” (gt) or “less than” (lt) operator in an IPv6 ACE, you cannot use the ACL for PFC QoS filtering.

–If you configure a DSCP value in one IPv6 ACL and a Layer 4 “greater than” (gt) or “less than” (lt) operator in another IPv6 ACL, you cannot use both ACLs in different class maps on the same interface for PFC QoS filtering.

•In Release 12.2(18)SXE and later releases, you can apply aggregate and microflow policers to IPv6 traffic, but you cannot apply microflow policing to IPv6 multicast traffic.

•With egress ACL support for remarked DSCP configured, the PFC3 does not provide hardware-assistance for these features:

–Cisco IOS reflexive ACLs

–TCP intercept

–Context-Based Access Control (CBAC)

–Network Address Translation (NAT)

•With a PFC3, you cannot apply microflow policing to ARP traffic.

•The PFC3 does not apply egress policing to traffic that is being bridged to the MSFC3.

•The PFC3 does not apply egress policing or egress DSCP mutation to multicast traffic from the MSFC3.

•With a PFC3, PFC QoS does not rewrite the ToS byte in bridged multicast traffic.

PFC2 Guidelines

•The PFC2 supports the match protocol class map command, which configures NBAR and sends all traffic on the Layer 3 interface, both ingress and egress, to be processed in software on the MSFC2. To configure NBAR, refer to this publication:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t8/dtnbarad.htm

•The PFC2 does not support these PFC QoS features:

–Egress policing

–Egress DSCP mutation

–DSCP Transparency

–VLAN-based QoS with DFCs installed

•The PFC2 does not support the modules that support ingress CoS mutation on IEEE 802.1Q tunnel ports.

 

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OL-4266-08

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Cisco Systems OL-4266-08 manual PFC2 Guidelines, 42-52
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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.

Technologically, OL-4266-08 covers a wide array of essential concepts, including IP telephony, voicemail, and collaborative tools. Candidates learn about the architecture of unified collaboration systems, involving integration with routing and switching networks. Additionally, it delves into security protocols to ensure secure transmissions of voice and video data, thereby protecting sensitive corporate communication.

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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