Fast Convergence for Designated Ports... [Read the rest of this entry -->]
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Archive for the 'Switching' Category
In this blog post, we will obtain some good solid Tier 1 level knowledge regarding VLAN Access Control Lists or VACLs. These are often also referred to as VLAN Access Maps or just VLAN Maps; thanks to the syntax that is used in their creation.... [Read the rest of this entry -->]
We are going to discuss Cisco’s proprietary extensions to STP algorithm, namely UplinkFast and BackBone Fast. Those two features aim to reduce the time it takes STP to re-activate topology after a link failure. While UplinkFast seems pretty intuitive, BB Fast is more complicated. ... [Read the rest of this entry -->]
In this post we are going to look into STP convergence process. Many people have perfect understanding of STP, but yet face difficulties when they see questions like “How many seconds will it take for STP to recover connectivity if a given link fails?”. The post will follow the outline below:... [Read the rest of this entry -->]
Solving for the Physical Topology Using a Logical Topology
Posted in CCENT, CCIE General, CCIE R&S, IP Addressing, Switching on Feb 4th, 2009
We see our students at all levels sometimes struggle building a network from the “ground-up” using a logical topology diagram. Let us use this blog post to examine a portion of a logical diagram and discuss how one could most easily and accurately setup the network.... [Read the rest of this entry -->]
CCIE R/S Lab Exam to Feature New Question Type
Posted in CCIE General, CCIE R&S, IGP, Switching on Jan 14th, 2009
Here are two announcements from Cisco regarding the addition of an “open-ended question” portion to the R/S Lab Exam. The first is the recent announcement, while the second is from August of 2008 when they were testing the process in Beta in China. Cisco has indicated on their forums that they will eventually update all tracks with this new open-ended question exam section. They will be making announcements prior to those track changes to give us the exact date of change.... [Read the rest of this entry -->]
In this post we will look at the basic classification and marking features available in the 3550 and 3560 switches. Basic features include packet marking using port-level settings and port-level policy-maps. Discussing Per-VLAN classification is outside the scope of this document.... [Read the rest of this entry -->]
This post continues the previous article dedicated to MSTP operations inside a single region. Before reading any further, make sure you read and fully understand the first part of MSTP overview: MSTP Tutorial Part I: Inside a Region. The information there is critical to understand the new post.... [Read the rest of this entry -->]
People are often confused with per-VLAN classification, policing and marking features in the Catalyst 3550 and 3560 models. The biggest problem is lack of comprehensive examples in the Documentation CD. Let’s quickly review and compare traffic policing features available on both platforms. The material below is a condensed excerpt of several Catalyst QoS topics covered in the “QoS” section of our IEWB VOL1 V5. You will find more in-depth explanations and large number of simulation-based verifications in the upcoming section of the workbook.... [Read the rest of this entry -->]
New IEWB-RS Volume 1 Version 5 Updates!
Posted in CCIE R&S, CCIE Workbooks, Frame-Relay, IGP, Switching on Aug 4th, 2008
More updates have been posted tonight to the CCIE Routing & Switching Lab Workbook Volume 1 Version 5.0 Beta on the member’s site. Bridging & Switching, Frame Relay, IP Routing, RIP, and EIGRP are now posted. Also there is a new feature that indicates when the files were updated last, so you will always know if you have the most current version.... [Read the rest of this entry -->]
Before we start with MSTP (Multiple Spanning Trees Protocol), I would like to note that this tutorial is going to be is divided in two parts. The first part describes how MSTP works inside a single region (the definition of the term will follow later). The second part is dedicated to MSTP region interaction with other regions and different STP protocols (IEEE STP, RSTP and Cisco PVST+).... [Read the rest of this entry -->]