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Review: Errdisable port state
Those of you “new” to the Cisco world, or those who simply don’t have experience in the layer 2 world may not have heard of errdisable (or simply might refer to it as the proper term, error-disable)- but any seasoned tech knows what a pain it is to check your port and see errdisable. Back [...]
QoS: Essentials, Part III
In the previous installment of this series (QoS: Essentials, Part II), we discussed types of marking, NBAR, and Congestion management/queuing techniques. With part III, I intend on discussing Traffic shaping /policing, Congestion avoidance, and link efficiency mechanisms. Because of the sheer amount of information in QoS, I cannot cover all of the QoS spectrum, but I hope to instill [...]
Frame Relay Traffic Shaping (FRTS)
While at a first glance, Frame Relay Traffic Shaping (or FRTS) seems daunting..it’s really not bad. For those of you unfamiliar with FRTS, I’ll present a couple of scenarios where you may need to configure it. High speed interface –> Low speed interface: Picture you have one node connecting to the frame relay cloud at [...]
Command of the week: Switchport protected
I have done my share of work in the networking field, and had never heard of this command. I have also not been exposed to a wide variety of layer 2 technologies, but I must say, that this is a very cool command. Granted, it could be considered old- or not on par with private VLAN’s [...]
Unicasting RIP updates without the neighbor statement
While reading through my Cisco Press CCIE lab workbook, I came upon a section of the configs that kind of threw me off. The lab asked you to configure RIP to unicast updates without using the neighbor/passive-interface command. For those of you unfamiliar with the “neighbor” way of doing things, here’s how it goes. You [...]
QoS: Essentials, Part II
In QoS: Essentials, Part I, we discussed what QoS is, classifying/marking traffic, and trust boundaries. In Part II, we will get into the actual types of marking, do an overview of NBAR, and finally get into Congestion management/Queuing. Ready? Types of Marking: There are several different ways to mark, and each one is suited for [...]
QoS: Essentials, Part I
Many of you reading this have been mystifyed by terms like WFQ, WRED, Jitter, or DiffServ. My aim in Part I of QoS: Essentials, is to take some of the mystique surrounding Quality of Service away. Let’s get to it! What is QoS? While in Iraq, we stayed in tiny trailers with 2 soldiers sharing [...]
