Computer networking, Cisco, routers, switches, and network infrastructure
A step-by-step IOS-XE guide covering IPv6 unicast routing, SLAAC, stateful and stateless DHCPv6, prefix delegation, OSPFv3 with address-family, ND security (RA Guard, ND Inspection), IPv6 ACLs, and essential troubleshooting commands with real show output.
Master Wireshark display and capture filters for Cisco IOS-XE environments. Learn how to use Embedded Packet Capture (EPC) on your router and apply targeted filters for STP, OSPF, BGP, DHCP, DNS, TCP, QoS, and VoIP troubleshooting.
A complete guide to configuring DMVPN Phase 2 on Cisco IOS-XE, covering IKEv2 IPsec, multipoint GRE, NHRP, and the critical EIGRP commands that make spoke-to-spoke tunnels actually work.
A complete technical guide to Cisco Catalyst SD-WAN (Viptela): understand the four-component architecture (vManage, vSmart, vBond, cEdge), how OMP drives the control plane, cEdge Day-0 onboarding, Application-Aware Routing, and essential IOS-XE CLI troubleshooting commands.
A complete hands-on guide to configuring MPLS L3VPN on Cisco IOS-XE — VRFs, LDP, MP-BGP with VPNv4, PE-CE BGP, route distinguishers, route targets, label verification, and production troubleshooting tips with real IOS-XE CLI output.
A deep-dive guide to BGP communities — standard, extended, and large — plus prefix-lists, AS-path filters, and route-maps on Cisco IOS-XE. Includes real CLI examples, show command output, and a production checklist for network engineers.
Configure centralized AAA on Cisco IOS-XE using TACACS+ and Cisco ISE, covering authentication method lists, per-command authorization, ISE policy sets, command sets, and real-world troubleshooting with full CLI examples.
A complete guide to enabling IPv6 on Cisco IOS-XE — dual-stack interfaces, OSPFv3 with address-family, DHCPv6 server and relay, RA Guard, DHCP Guard, and BGP IPv6 peering with real CLI examples.
A hands-on guide to DMVPN Phase 2 on Cisco IOS-XE — configure mGRE tunnels, NHRP, IPsec, and EIGRP for direct spoke-to-spoke VPN connectivity without static tunnel configuration between sites. Includes real CLI examples and troubleshooting guidance.
A complete engineer guide to upgrading Catalyst 9000 series switches on IOS-XE: converting from Bundle Mode to Install Mode, running ISSU on StackWise stacks, applying targeted SMU patches, and maintaining a golden image across your fleet.
A practical deep dive into Spanning Tree Protocol and RSTP on Cisco IOS-XE. Covers root bridge election, PortFast, BPDU Guard, Root Guard, Loop Guard, Bridge Assurance, TCN storm troubleshooting, and Catalyst 9000 gotchas with real show command output.
A complete hands-on guide to configuring MPLS L3VPN on Cisco IOS-XE — from LDP label distribution and VRF definitions to BGP VPNv4 peering, PE-CE routing options, and VRF route leaking, with real CLI examples and show command output throughout.
