Below is a long list of useful books and links that I’ve found in my studies for the CCIE. Many of the links go to resources on cisco.com, so you may need a CCO account to view them.

• Enhanced Interior Gateway Routing Protocol
• Redistributing Routing Protocols
• How Does Unequal Cost Path Load Balancing (Variance) work in IGRP and EIGRP?
• BGP Case Studies
• BGP Best Path Selection Algorithm
• IP Routing: BGP Configuration Guide, Cisco IOS (15 M&T)
• Understanding Cisco EEM by examples – Part 1
• Understanding Cisco EEM by examples – Part 2
• OSPFv2 Loop-Free Alternate Fast Reroute
• Understanding Unicast Reverse Path Forwarding
• Configuring Performance Monitoring
• LISP Functional Overview
• Cisco IOS MPLS Virtual Private LAN (VPLS)
• L2VPN and Carrier Ethernet Concepts
• Intermediate System-to-Intermediate System (IS-IS) Protocol
• Carrier Ethernet Tech Overview
• Configuring a Rendezvous Point (PIM-SM)
• RFC 6296 – IPv6-to-IPv6 Network Prefix Translation
• Embedded Event Manager (EEM) Overview
• Embedded Packet Capture Configuration Guide
• Writing EEM Policies using TCL
• QoS Configuration Guide
• Configuring Cisco IOS IP SLA Operations
• Cloud Computing – A Primer
• Principles of Application Centric Infrastructure (ACI)
• Criteria for Naming Multilink PPP Bundles
• Configuring Private VLANs
• Understanding and Configuring PPP CHAP Authentication
• Route Target Constraint
• BGP Enhanced Route Refresh
• Unified MPLS Configuration Example
• Configuring BGP PIC Edge and Core for IP and MPLS
• RFC 5880 – Bidirectional Forwarding Detection (BFD)
• Implementing Tunneling for IPv6
• BGP Case Studies
• First Hop Redundancy Protocols Configuration Guide (GLBP, HSRP, IRDP, and VRRP)
• Next Hop Resolution Protocol (NHRP)
• Introduction to Cisco IPsec Technology
• IS-IS Overview and Basic Configuration
• What is the Internet of Things (IoT)?
• Comparing Traffic Policing and Traffic Shaping for Bandwidth Limiting
• Review: Puppet vs. Chef vs. Ansible vs. Salt
• Configuring IEEE 802.1x Port-Based Authentication
• Cisco Performance Routing
• Cisco Performance Routing (PfR) DocWiki
• Configuring Traffic Policing
• Ethernet Virtual Connections (EVC)
• LLDP-MED and Cisco Discovery Protocol (CDP)
• Configuring Performance Routing Cost Policies
• Cisco Group Encrypted Transport VPN (GET VPN)
• Implementing IPv6 Addressing and Basic Connectivity
• Cisco Express Forwarding (CEF) Overview
• CEF – Configuring a Load-Balancing Scheme
• When are ICMP Redirects Sent?
• IPv6 MTU Path Discovery
• IP Multicast Technology Overview
• BGP PIC Edge for IP and MPLS-VPN
• Cisco IOS GETVPN Solution Deployment Guide
• Performance Routing Link Groups
• OSPF Neighbor States
• Configuring Overlay Transport Virtualization (OTV)
• Implementing Tunneling for IPv6
• Using the Extended ping and Extended traceroute commands
• Bidirectional PIM
• IPv6 Source Guard and Prefix Guard
• Ethernet Virtual Connections (EVC)
• Control Plane Policing Implementation Best Practices
• Configuring Source Specific Multicast (SSM)
• Configuring IPv6 MLD Snooping
• Ethernet Access for Next Generation Metric and Wide Area Networks
• ISATAP Tunnel Support for IPv6
• WAN Virtualization using Over the ToP (OTP)
• Configuring MPLS Layer 3 VPNs
• Implementing OSPFv3
• EIGRP Loop-Free Alternate Fast Reroute (LFA FRR)
• Carrier Ethernet Services (MEF)
• Spanning Tree from PVST+ to Rapid-PVST Migration Configuration Example
• Understanding MSTP
• RFC 3101 – The OSPF Not-So-Stubby-Area (NSSA) Option
• CEF Polarization
• Resolve IP Fragmentation, MTU, MSS, and PMTUD Issues with GRE and IPSEC
• TTL Expiry Attack Identification and Mitigation
• Configuring TCP
• Configuring Cisco Performance Monitor
• Errdisable Port State Recovery on the Cisco IOS Platforms
• VLAN Trunking Protocol (VTP)
• Understanding Rapid Spanning Tree Protocol (802.1w)
• STP and MST (Understanding and Configuration)
• Configuring Spanning Tree Protocol
• Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard
• Configuring Optional Spanning-Tree Features
• Catalyst Switched Port Analyzer (SPAN) Configuration Example
• Virtual Switching System (VSS) Q&A
• Virtual Switching Systems (VSS)
• Configuring Flex Links
• Cisco StackWise and StackWise Plus Technology
• IP Multicast: Customizing IGMP
• IPv4 IGMP Filtering and Router Guard
• Implementing IPv6 Multicast
• PIM Snooping
• PPP Troubleshooting Flowchart
• Point-to-Point Protocol (PPP)
• Troubleshooting PPP (CHAP or PAP) Authentication
• Configuring and Troubleshooting PPP Password Authentication Protocol (PAP)
• IPv6 Neighbor Discovery
• Implementing DHCP for IPv6
• IP Multicast Troubleshooting Guide
• IP Multicast Technology Overview
• Using MSDP to Interconnect Multiple PIM-SM Domains
• Configuring VRF
• Policy-Based Routing
• Add Path Support in EIGRP
• NTPv4 in IPv6
• OSPF Demand Circuit Feature
• OSPF Shortest Path First Throttling
• OSPF Support for Fast Hello Packets
• Computing Complex Wildcard Masks for Access-Lists
• MPLS Label Distribution Protocol (LDP)
• DMVPN: The Phases In-Depth
• MPLS VPN support for EIGRP between PE and CE
• EIGRP MPLS VPN PE-CE Site of Origin (SoO)