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
Learn BGP attributes and path selection in detail. Explore AS_PATH, LOCAL_PREF, MED, and more with examples, rules, and benefits for network optimization. Border Gateway Protocol (BGP) is the routing protocol that holds the internet together. Unlike protocols such as OSPF or EIGRP, which rely on metrics like cost or hop count, BGP makes routing decisions … Read more
Learn how BGP Allowas-in helps overcome eBGP routing loop issues in MPLS VPNs and multi-homed networks. Step-by-step lab, configs, and troubleshooting included. The Border Gateway Protocol (BGP) is the backbone of inter-domain communication, enabling autonomous systems (ASes) across the globe to exchange routing information. While BGP is robust and scalable, certain scenarios—especially in MPLS VPN … Read more
BGP Messages Explained: A Beginner-Friendly Guide If you’ve ever wondered “How does the internet know where to send my data?”, the answer is a protocol called BGP (Border Gateway Protocol). Think of BGP as the GPS system of the internet. It helps your data find the best and most reliable path to its destination. But … Read more
If you’ve ever wondered what eBGP really is, how it works behind the scenes, and why it’s such a crucial piece of the Internet’s backbone — you’re in the right place. In this post, we’re going to break down: Whether you’re preparing for a job interview, studying for a certification, or just exploring advanced routing … Read more