Versatile Routing and Services with BGPUnderstanding and Implementing BGP in SR-OS
Design a robust BGP control plane within a secure, scalable network for smoother services A robust Border Gateway Protocol setup is vital to ensuring reliable connectivity, an essential capability for any organization. The Internet has become a necessary, always-on service in homes and businesses, and BGP is the protocol that keeps communication flowing. But BGP also has become crucial to delivery of intra-domain business services. But the network is only as reliable as BGP, so service enablement depends upon making BGP more stable, reliable, and service-rich. Alcatel-Lucent Service Router Operating System is engineered to bear the load of the most demanding networks. The system features support for Symmetric Multiprocessing and unprecedented depth of advanced routing features, all within a single OS that's supported across the entire Alcatel-Lucent IP/MPLS router portfolio. Versatile Routing and Services with BGP provides guidance toward implementation of BGP within SR-OS, and details the use and control of each feature. The book provides in-depth coverage of topics such as: BGP/MPLS IP-VPN, VPLS, VPWS Labeled Unicast IPv4, reconvergence, and multicast Security, graceful restart and error handling IPv6 PE (6PE) and IPv6 extensions to BGP/MPLS IP-VPN A look at forthcoming features such as Ethernet VPN Basic BGP competency is assumed, but the book is accessible even to those with zero familiarity with Alcatel-Lucent's SR-OS. It underscores the idea that BGP is more than just service enablement, and can also be used for infrastructure layer transport - but both layers must be solid, scalable, and able to quickly reconverge. Versatile Routing and Services with BGP demonstrates the creation of a robust BGP control plane within a, secure network, allowing the delivery of flawless, uninterrupted service.
Foreword xi Introduction xiii Chapter 1 Getting Started 1 Session Negotiation and Capabilities 3 UPDATE Messages 6 NOTIFICATION Messages 8 Multi-Protocol BGP 10 Chapter 2 BGP/MPLS IP-VPN 13 Basic Configuration 14 Prefix Dissemination 17 Automatic Route Filtering 17 Route Refresh 19 Outbound Route Filtering 20 Soft Reconfiguration 22 Route Target Constraint 22 Extensions for IPv6 VPN (6VPE) 29 Core Requirements 31 PE to CE BGP Peering 33 Multi-AS Backbones (Inter-AS) 42 Chapter 3 Using BGP in VPLS 49 BGP Auto-Discovery with LDP Signaling 54 BGP Auto-Discovery and Signaling 58 BGP Multi-Homing 62 Chapter 4 BGP Signaling for VPWS 73 BGP VPWS 74 Single-Homed VPWS 76 Multi-Homed VPWS 82 Dynamic Multi-Segment Pseudowire 94 Chapter 5 Labeled Unicast IPv4 105 Seamless MPLS 107 Transport Layer 108 Service Layer 114 Inter-AS Type C 118 Carriers' Carrier 124 Notes 131 Chapter 6 Reconvergence 133 Advertisement of Multiple Paths 134 Best External 139 Next-Hop Tracking 142 Prefix Independent Convergence (PIC) 146 Core PIC 147 Edge PIC 147 Minimum Route Advertisement Interval 152 BGP Anycast 154 Chapter 7 Multicast 165 Inter-Domain IPv4-IPv6 PIM 166 Multicast in MPLS/BGP IP-VPNs 173 Draft-Rosen 173 Multicast VPN 185 Chapter 8 Graceful Restart and Error Handling 205 Graceful Restart Mechanism 206 Error Handling 214 Chapter 9 Security 221 FlowSpec 222 Attack Mitigation with Blackhole Action 226 Attack Mitigation with Redirect to VRF Action 229 Remote Triggered Blackholing 233 Generalized TTL Security Mechanism 236 Auto-Generation of Filters for BGP Peers 237 Chapter 10 General Applicability 243 IPv6 PE Router (6PE) 244 Load-Balancing 248 IBGP-Multipath 248 Multipath 251 EIBGP Multipath 256 IGP Shortcuts 259 Split Horizon 263 Peer Groups 266 BGP in Residential Broadband Networks 268 QoS Policy Propagation Using BGP 276 Route Policy Framework 282 Basic Path Attribute Manipulation 285 Nested Policies (Next-Policy) 288 Subroutines 294 Notes 300 Chapter 11 Looking Ahead 301 Ethernet VPN (EVPN) 302 Ethernet Auto-Discovery Route 304 MAC Advertisement Route 305 Inclusive Multicast Ethernet Tag Route 307 Ethernet Segment Route 307 IP Prefix Advertisement Route 307 Multi-Homing Mode 309 Control-Plane-Only Route-Reflection 310 Virtual Route-Reflector 311 Optimal Route Reflection (ORR) 313 Prefix Origin Validation 315 Link State Information Distribution Using BGP 317 Appendix A Path Selection Process 321 References and Glossary 329 Index 335
Colin Bookham is a consulting engineer at Alcatel-Lucent with more than 20 years of experience in the telecommunications industry.
A resource reference for network architects and designers who need to design and deploy the ever-increasing range of technologies that use BGP as the control-plane. Versatile Routing and Services with BGP presents how you can optimize your BGP implementation to provide fast reconvergence and high availability, how to increase tolerance to errors, and concludes with a look at what the future has in store for BGP. It covers the implementation of base services such as IP-VPN, VPLS, and VPWS, as well as advanced services such as Multicast/Multicast-VPN, IPv6, and enhanced security functions to help protect the network edge. "I would definitely recommend this book to anyone who needs to work with BGP on a daily basis, or who is looking for an all-in-one guide to contemporary BGP." iLya Varlashkin – Principal Engineer, Easynet Global Services "More than a beginner's guide to BGP, this book explores the full range of BGP- enabled technologies that can be deployed on Alcatel-Lucent SR-OS networks with lots of example configurations — it is a valuable addition to my reference shelf." Chris Chaundy – Senior ISP IP Engineer, Nextgen Group "This book presents the new BGP features introduced over the last decade to support the latest network and service requirements It is a very useful book for network engineers." Bruno Decraene – Senior Network Architect, Orange "...this book serves as a great reference for optimizing network performance and improving customer experience by demonstrating a number of capabilities of the Alcatel-Lucent 7750 for dynamic service provisioning, fast service restoration, high availability, PE resource optimization and network capacity optimization." Amit Khopkar – Head- IP Network Development, BSkyB
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