Troubleshooting BGP

Troubleshooting BGP

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The definitive guide to troubleshooting todaya€™s complex BGP networks This is todaya€™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 todaya€™s blended service provider and enterprise environments. Two expert authors emphasize the BGP-related issues youa€™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. Am Quickly review the BGP protocol, configuration, and commonly used features Am Master generic troubleshooting methodologies that are relevant to BGP networks Am Troubleshoot BGP peering issues, flapping peers, and dynamic BGP peering Am Resolve issues related to BGP route installation, path selection, or route policies Am Avoid and fix convergence problems Am Address platform issues such as high CPU or memory usage Am Scale BGP using route reflectors, diverse paths, and other advanced features Am Solve problems with BGP edge architectures, multihoming, and load balancing Am Secure BGP inter-domain routing with RPKI Am Mitigate DDoS attacks with RTBH and BGP Flowspec Am Understand common BGP problems with MPLS Layer 3 or Layer 2 VPN services Am Troubleshoot IPv6 BGP for service providers, including 6PE and 6VPE Am Overcome problems with VXLAN BGP EVPN data center deployments Am Fully leverage BGP High Availability features, including GR, NSR, and BFD Am 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.Local Preference 3. Local originated (network statement, redistribution, aggregation) 4. AIGP 5. ShortestAS Path 6. Origin Type 7. Lowest MED 8. EBGP over IBGP 9. Lowest IGP NextHop 10. If both paths are external (EBGP), prefer the first (oldest) ... IOS XR uses route policies for filtering of routes. ... BGP supports two methods of clearing a BGP session: The first method is a hard reset, which tears down the BGP session, removes BGP routes from the peer, and is the most disruptive.

Title:Troubleshooting BGP
Author: Vinit Jain, Brad Edgeworth
Publisher:Cisco Press - 2016-12-23

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