This exercise has been done on Nexus 7010 chassis with the following pieces installed:- Dual supervisor modules, dual power supplies, dual system fans, dual fabric fans, and three fabric modules per chassis. One 48-port 1 Gigabit Ethernet I/O module per…
What is GLBP and Why do we use it? GLBP stands for Gateway Load Balancing Protocol and it is a Cisco proprietary First Hop Redundancy Protocol that attempts to overcome the limitations of existing redundant router protocols by adding basic load…
How to copy a large "Show Tech-support" output from a Cisco device using Putty. This is useful in case you are unable to copy the entire content of the output in one go.
⚠️ Legacy Technology Notice: This article covers legacy Cisco transparent bridging with IRB using deprecated bridge-group commands from classic IOS. These commands do not work on modern IOS-XE or IOS-XR platforms. This content is preserved for historical reference and exam…
In the dynamic world of network engineering, troubleshooting is a timeless skill. While protocols evolve and tools advance, the fundamental principles of packet analysis remain critical. This post, originally penned in 2011, explored a classic, albeit niche, trick to discover…
Today, we revisit a foundational Cisco feature: **Optimized Edge Routing (OER)**, more commonly known now as **Performance Routing (PfR)**. In 2011, we explored how this “brain” could monitor network paths and intelligently route traffic based on real-time metrics like **jitter**,…
Today we delve into the foundational architecture of MSDP with BGP IPv4 Multicast address-family. While initially published in 2011, the core principles of inter-Autonomous System (AS) multicast routing remain critical for understanding modern network designs. This updated post revisits the…
Spanning Tree Protocol (STP) remains a critical Layer 2 defense mechanism, even in the age of advanced network fabrics. The STP Root Guard feature is an indispensable tool for preventing rogue switches from becoming the root bridge, thus maintaining network…
3560/3550 Recovery Procedure———————————— Connect a PC to the console port of the switch, Use a terminal emulation program such as Microsoft Windows HyperTerminal in order to establish the console session. These are the settings: Bits per second: 9600 Data bits:…
As a network engineer, I’ve broken configs enough times to know the value of a solid rollback strategy. One of the most powerful, yet sometimes underutilized, commands in the Cisco IOS and IOS-XE toolkit is configure replace. While it might…