In the process of writing the article series about the DHCP Snooping, I realized that DHCP Relays are a subject that is often misunderstood by network engineers. The aim of this article, which we can say is an appendix to the “Understanding DHCP Snooping” series is to explore the functionality of DHCP Relays, as implemented by Cisco IOS.
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The following is an excerpt from the upcoming IPexpert book – IPv4/IPv6 QoS Operation and Troubleshooting

One of the points that many Cisco QoS texts fail to make clear is that a typical Cisco network device interface possess a software queue and a hardware queue for outbound traffic transmissions. When we read that a particular QoS tool will engage and work in times of congestion only, this is a reference to packets overflowing the hardware queue into the software queue. The software queue is where the magic of Quality of Service happens. In fact, one of the QoS mechanisms called Link Fragmentation and Interleaving (LFI) directly addresses the split between these two queues. LFI ensures that large packets (Jumbograms) do not clog the hardware queue. These large packets are chopped up (fragmented) so that higher priority, smaller packets (like voice) can be interwoven between the fragments in the hardware queue. Chapter 11: Link Fragmentation and Interleaving (LFI) details this process for you.
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IPexpert’s IPv4/IPv6 Quality of Service (QoS) Operation and Troubleshooting offers readers an intense, topic-based, step-by-step guide to fully understanding IPv4 and IPv6 QoS technologies as well as troubleshooting techniques. This guide is the second installment of IPexpert’s new expert-level instruction on specific modern network technologies.

This series was designed around CCIE student feedback on specific technologies that they feel they struggled with most when preparing for the CCIE Lab exam regardless of the specific track they were on. IPexpert’s IPv4/IPv6 Quality of Service (QoS)  Operation and Troubleshooting dives deep into the specific multicast technologies including, congestion management and avoidance,  traffic shaping and policing, RSVP and more.

If you feel you could use additional IPv4/IPv6 Quality of Service (QoS) Operation and Troubleshooting preparation, this guide was designed specifically for you. Developed by IPexpert’s highly-experienced team of CCIE instructors, you can be certain that this guide is the most up-to-date and refined product on the market.  The experience gained through these in-depth explanations on IPv4/IPv6 Quality of Service (QoS) technologies along with accompanying sample Trouble Tickets will serve as an invaluable step towards success in your network implementation and/or CCIE written and lab success.

The sample Trouble Tickets that accompany each chapter have been built against R&S rack rentals at ProctorLabs.com and have also been fully tested to work against home practice racks and the most popular equipment emulators.

Date of publication– April 30, 2012

Table of Contents

Chapter 1: Introduction to IPv4/6 Quality of Service (QoS) Operation and Troubleshooting
Chapter 2: Overall Quality of Service (QoS) Approaches
Chapter 3: Configuration and Monitoring Tools
Chapter 4: Classification
Chapter 5: Marking
Chapter 6: Congestion Management
Chapter 7: Congestion Avoidance
Chapter 8: Traffic Shaping
Chapter 9: Traffic Policing
Chapter 10: Compression
Chapter 11: Link Fragmentation and Interleaving (LFI)
Chapter 12: Resource Reservation Protocol (RSVP)
Chapter 13: Call Admission Control (CAC)
Chapter 14: Multiprotocol Label Switching (MPLS) Traffic Engineering
Chapter 15: Wireless Quality of Service (QoS)
Chapter 16: Catalyst Quality of Service (QoS)
Chapter 17: IPv6 Quality of Service (QoS)

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Anthony Sequeira CCIE, CCSI
Twitter: @compsolv
Facebook: http://www.facebook.com/compsolv

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IPexpert is thrilled to announce an unmatched product for the mastery of IPv4/6 multicast. Whether your concerns are troubleshooting or configuration, this book ensures that you master all relevant blueprint topics.

For questions or feedback regarding the new book, email compsolv@me.com.

IPv4/6 Multicast Operation and Troubleshooting

Chapter 1: Introduction to IPv4/6 Multicast Operation and Troubleshooting IGMP
Chapter 2: Internet Group Management Protocol (IGMP)
Chapter 3: Protocol Independent Multicast – Dense Mode (PIM-DM)
Chapter 4: Protocol Independent Multicast – Sparse Mode (PIM-SM)
Chapter 5: Protocol Independent Multicast – Sparse-Dense Mode (PIM-S-DM)
Chapter 6: Bidirectional Protocol Independent Multicast (BIDIR-PIM)
Chapter 7: Static Rendezvous Points (RPs)
Chapter 8: AutoRP
Chapter 9: Bootstrap Router Protocol (BSR)
Chapter 10: Multicast Source Discovery Protocol (MSDP)
Chapter 11: Anycast-RP
Chapter 12: Multiprotocol-BGP (MP-BGP)  and Interdomain Multicast
Chapter 13: Multicast Security and Advanced Features
Chapter 14: IPv6 Multicast

Anthony Sequeira CCIE, CCSI
Twitter: @compsolv
Facebook: http://www.facebook.com/compsolv

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