When you connect multiple devices to a network switch, the switch normally forwards broadcasts and multicasts to every port (except the one that sent the traffic). This means all devices can “hear” each other, which can create unnecessary noise and reduce performance in large networks. That’s where VLANs (Virtual Local Area Networks) come in. VLANs … Read more
When devices communicate in a computer network, they need a way to send and receive data. The method of communication between two devices is called the transmission mode. Think of it like a road: some roads allow traffic in one direction only, while others allow traffic both ways. In networking, there are three main transmission … Read more
Learn the difference between collision domain and broadcast domain in computer networks. Understand how hubs, switches, and routers handle them with easy examples for beginners. When we talk about computer networks, two important concepts often come up – collision domain and broadcast domain. These terms might sound technical, but once you break them down, they … Read more
Learn why BGP prefers eBGP routes over iBGP when all attributes are equal. This blog explains the concept with an easy topology, configuration, and clarification on the AD vs path selection confusion. In the previous blogs, we explored several BGP path selection attributes like Weight Local Preference Locally Originated AS Path Origin Code MED Each … Read more
Learn how the BGP MED (Multi-Exit Discriminator) attribute influences path selection in multi-homed networks. Understand its configuration, verification, and impact on inbound traffic for optimized routing. In the previous blogs, we explored several BGP path selection attributes such as Weight, Local Preference, Locally Originated, AS Path Length, and Origin Code. Moving forward in the selection … Read more
Explore how BGP Origin Code influences path selection in routing decisions. Learn the differences between IGP, EGP, and Incomplete origins with configuration examples, verification outputs, common mistakes, and interview questions for a clear understanding of this BGP attribute. When we dive into BGP path selection, it’s all about how routers decide the best path when … Read more
Learn how the BGP AS-Path attribute influences path selection, prevents routing loops, and helps control inbound traffic using AS-Path prepending. Simple examples and configurations included. In our previous blogs, we started exploring how BGP (Border Gateway Protocol) decides the “best path” when multiple routes are available. We first looked at the Weight attribute, then the … Read more
Learn how BGP selects the best path using the ‘Originated Locally’ attribute. Understand route origination via network, redistribution, and aggregate commands with examples, configuration, and verification to simplify BGP path selection. When multiple routes exist to reach the same destination, BGP (Border Gateway Protocol) applies a step-by-step decision process to select the “best path.” Each … Read more
Learn how BGP Local Preference works in the path selection process. This step-by-step guide explains its role, configuration, and real-world examples to influence outbound traffic routing. In the previous blog, we explored the first BGP path selection attribute — Weight. Now, it’s time to move on to the second attribute in the decision process: Local … Read more
Understanding BGP Weight Attribute – The Complete Guide for Network Engineers The BGP weight attribute is a Cisco-proprietary value used to influence the best path selection process on a local router. It is a numeric value ranging from 0 to 65535, where paths with higher weight values are preferred. Importantly, this weight attribute is local … Read more