The definitive deep-dive guide to hardware and software troubleshooting on Cisco Nexus switches The Cisco Nexus platform and NX-OS switch operating system combine to deliver unprecedented speed, capacity, resilience, and flexibility in today's data center networks. Troubleshooting Cisco Nexus Switches and NX-OS is your single reference for quickly identifying and solving problems with these business-critical technologies. Three expert authors draw on deep experience with large Cisco customers, emphasizing the most common issues in real-world deployments, including problems that have caused major data center outages. Their authoritative, hands-on guidance addresses both features and architecture, helping you troubleshoot both control plane forwarding and data plane/data path problems and use NX-OS APIs to automate and simplify troubleshooting. Throughout, you'll find real-world configurations, intuitive illustrations, and practical insights into key platform-specific behaviors. This is an indispensable technical resource for all Cisco network consultants, system/support engineers, network operations professionals, and CCNP/CCIE certification candidates working in the data center domain. * Understand the NX-OS operating system and its powerful troubleshooting tools * Solve problems with cards, hardware drops, fabrics, and CoPP policies * Troubleshoot network packet switching and forwarding * Properly design, implement, and troubleshoot issues related to Virtual Port Channels (VPC and VPC+) * Optimize routing through filtering or path manipulation * Optimize IP/IPv6 services and FHRP protocols (including HSRP, VRRP, and Anycast HSRP) * Troubleshoot EIGRP, OSPF, and IS-IS neighbor relationships and routing paths * Identify and resolve issues with Nexus route maps * Locate problems with BGP neighbor adjacencies and enhance path selection * Troubleshoot high availability components (BFD, SSO, ISSU, and GIR) * Understand multicast protocols and troubleshooting techniques * Identify and solve problems with OTV * Use NX-OS APIs to automate troubleshooting and administrative tasks

Understand the fundamentals of the Wireshark tool that is key for network engineers and network security analysts. This book explains how the Wireshark tool can be used to analyze network traffic and teaches you network protocols and features. Author Vinit Jain walks you through the use of Wireshark to analyze network traffic by expanding each section of a header and examining its value. Performing packet capture and analyzing network traffic can be a complex, time-consuming, and tedious task. With the help of this book, you will use the Wireshark tool to its full potential. You will be able to build a strong foundation and know how Layer 2, 3, and 4 traffic behave, how various routing protocols and the Overlay Protocol function, and you will become familiar with their packet structure. Troubleshooting engineers will learn how to analyze traffic and identify issues in the network related to packet loss, bursty traffic, voice quality issues, etc. The book will help you understand the challenges faced in any network environment and how packet capture tools can be used to identify and isolate those issues. This hands-on guide teaches you how to perform various lab tasks. By the end of the book, you will have in-depth knowledge of the Wireshark tool and its features, including filtering and traffic analysis through graphs. You will know how to analyze traffic, find patterns of offending traffic, and secure your network. What You Will Learn Understand the architecture of Wireshark on different operating systems Analyze Layer 2 and 3 traffic frames Analyze routing protocol traffic Troubleshoot using Wireshark Graphs Who This Book Is For Network engineers, security specialists, technical support engineers, consultants, and cyber security engineers

The LISP overlay protocol helps organizations provide seamless connectivity to devices and workloads wherever they move, enabling open and highly scalable networks with unprecedented flexibility and agility. LISP Network Deployment and Troubleshooting is the single source for understanding, configuring and troubleshooting LISP on Cisco IOS, IOS XR and NX-OS platforms. It brings together comprehensive coverage of how LISP works, how it integrates with leading Cisco platforms, how to configure it for maximum efficiency, and how to troubleshoot LISP-related issues such as scalability and convergence. Focusing on design and deployment in real production environments, leading Cisco LISP engineers Tarique Shakil and Vinit Jain offer authoritative coverage of deploying LISP, verifying its operation, and optimizing its performance in widely diverse environments. Drawing on their unsurpassed experience supporting LISP deployments, they share detailed configuration examples, templates, and best practices designed to help you succeed with LISP no matter how you intend to use it. Coverage includes: Problems LISP solves, current use cases, and powerful emerging applications Standards and architecture, including control and data planes, packets, messaging, and communication processes LISP IPv4 unicast routing, IPv6 enablement/transition, and multicast LISP mobility in traditional data center and VXLAN fabrics LISP network virtualization and multi-tenancy LISP in the enterprise multi-homed Internet/WAN edge Securing, managing, and automating LISP

Modernize and optimize network management with APIs and automation Legacy network management approaches don't scale adequately and can't be automated well. This guide will help meet tomorrow's challenges by adopting network programmability based on Application Programming Interfaces (APIs). Using these techniques, you can improve efficiency, reliability, and flexibility; simplify implementation of high-value technologies; automate routine administrative and security tasks; and deploy services far more rapidly. Four expert authors help you transition from a legacy mindset to one based on solving problems with software. They explore today's emerging network programmability and automation ecosystem; introduce each leading programmable interface; and review the protocols, tools, techniques, and technologies that underlie network programmability. You'll master key concepts through hands-on examples you can run using Linux, Python, Cisco DevNet sandboxes, and other easily accessible tools. This guide is for all network architects, engineers, operations, and software professionals who want to integrate programmability into their networks. It offers valuable background for Cisco DevNet certification-and skills you can use with any platform, whether you have software development experience or not. Master core concepts and explore the network programmability stack Manage network software and run automation scripts in Linux environments Solve real problems with Python and its Napalm and Nornir automation frameworks Make the most of the HTTP protocol, REST architectural framework, and SSH Encode your data with XML, JSON, or YAML Understand and build data models using YANG that offer a foundation for model-based network programming Leverage modern network management protocols, from gRPC and gNMI to NETCONF and RESTCONF Meet stringent service provider KPIs in large-scale, fast-changing networks Program Cisco devices running IOS XE, IOS XR, and NX-OS as well as Meraki, DNA Center, and Webex platforms Program non-Cisco platforms such as Cumulus Linux and Arista EOS Go from "zero to hero" with Ansible network automation Plan your next steps with more advanced tools and technologies

The definitive guide to troubleshooting today's complex BGP networks This is today's best single source for the techniques you need to troubleshoot BGP issues in modern Cisco IOS, IOS XR, and NxOS environments. BGP has expanded from being an Internet routing protocol and provides a scalable control plane for a variety of technologies, including MPLS VPNs and VXLAN. Bringing together content previously spread across multiple sources, Troubleshooting BGP describes BGP functions in today's blended service provider and enterprise environments. Two expert authors emphasize the BGP-related issues you're most likely to encounter in real-world deployments, including problems that have caused massive network outages. They fully address convergence and scalability, as well as common concerns such as BGP slow peer, RT constraint filtering, and missing BGP routes. For each issue, key concepts are presented, along with basic configuration, detailed troubleshooting methods, and clear illustrations. Wherever appropriate, OS-specific behaviors are described and analyzed. Troubleshooting BGP is an indispensable technical resource for all consultants, system/support engineers, and operations professionals working with BGP in even the largest, most complex environments. * Quickly review the BGP protocol, configuration, and commonly used features * Master generic troubleshooting methodologies that are relevant to BGP networks * Troubleshoot BGP peering issues, flapping peers, and dynamic BGP peering * Resolve issues related to BGP route installation, path selection, or route policies * Avoid and fix convergence problems * Address platform issues such as high CPU or memory usage * Scale BGP using route reflectors, diverse paths, and other advanced features * Solve problems with BGP edge architectures, multihoming, and load balancing * Secure BGP inter-domain routing with RPKI * Mitigate DDoS attacks with RTBH and BGP Flowspec * Understand common BGP problems with MPLS Layer 3 or Layer 2 VPN services * Troubleshoot IPv6 BGP for service providers, including 6PE and 6VPE * Overcome problems with VXLAN BGP EVPN data center deployments * Fully leverage BGP High Availability features, including GR, NSR, and BFD * Use new BGP enhancements for link-state distribution or tunnel setup This book is part of the Networking Technology Series from Cisco Press, which offers networking professionals valuable information for constructing efficient networks, understanding new technologies, and building successful careers.