A practical guide to configuring TACACS+ AAA with Cisco ISE on Cisco IOS-XE. Covers per-command authorization, accounting, safe local fallback, ISE Device Admin policy sets, and SSH hardening — with real IOS-XE CLI syntax and show command output.
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.
Configure SNMPv3 with authPriv on Cisco IOS-XE, set up LibreNMS for auto-discovery, and build Grafana dashboards for interface utilization, BGP neighbor states, and CPU monitoring. Complete CLI guide with real IOS-XE show command output.
Master Wireshark display and capture filters for BGP, OSPF, STP, DMVPN, QoS, and TCP troubleshooting on Cisco IOS-XE. Includes tshark scripting examples, EPC setup, and a quick-reference cheat sheet.
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.
BGP communities let you attach policy metadata to routes across your entire network. This guide covers standard, extended, and large communities on Cisco IOS-XE — with real CLI examples for tagging, filtering, RTBH blackholing, and a complete dual-homed enterprise policy configuration.
A complete guide to DMVPN Phase 2 on Cisco IOS-XE: configure mGRE tunnels, NHRP registration, EIGRP with split-horizon disabled, and IPsec encryption. Includes troubleshooting commands and a final verification checklist.
Build a probe-verified dual-ISP failover system on Cisco IOS-XE using IP SLA and Object Tracking. When your primary ISP loses internet connectivity — even if the physical link stays up — automated failover kicks in within seconds without any manual intervention.
Learn how to configure SNMP v3 on Cisco IOS-XE devices with real CLI examples, then feed that data into LibreNMS and Grafana for production-grade network visibility.
Learn how to configure centralized AAA on Cisco IOS-XE using TACACS+ and Cisco ISE 3.3.
A complete, command-by-command walkthrough for upgrading Cisco Catalyst 9300/9400/9500 switches: bundle mode vs. install mode, the install add/activate/commit workflow, ISSU eligibility, common failure scenarios including rommon recovery, post-upgrade verification, and rollback procedures — all with real IOS-XE output.
