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.
BGP communities let you carry policy intent alongside your routes — tag once, match everywhere. This guide covers community configuration, route filtering with prefix-lists and AS-path filters, remotely triggered blackholing (RTBH), large communities, and production best practices with real IOS-XE CLI examples.
STP and RSTP on Cisco IOS-XE explained in depth — root bridge placement, PortFast, BPDU Guard, Root Guard, Loop Guard, and a step-by-step troubleshooting workflow with real CLI command output.
Stop guessing who ran that change at 2am. This guide walks through configuring TACACS+ with Cisco ISE on IOS-XE — AAA method lists, command authorization, per-command accounting, and hardening steps with real CLI examples on Catalyst 9300 and ISR 4000.
Most enterprise networks still run dual-stack at best in 2026. This guide covers full IPv6 deployment on Cisco IOS-XE: addressing, OSPFv3, DHCPv6, ACLs, BGP, and the verification commands that actually tell you what’s broken — with real CLI output and production gotchas.
A practical guide to diagnosing and fixing the most common OSPF adjacency failures on Cisco IOS-XE — MTU mismatches, timer conflicts, authentication errors, duplicate Router IDs, and flapping neighbors — with real show command output and CLI fixes.
Cisco’s Embedded Event Manager (EEM) is one of the most underutilized features in IOS-XE. This guide covers six practical EEM applets — from BGP peer monitoring and interface flap detection to nightly config backups and CPU spike capture — with real CLI syntax and Cat9K-specific tips.
