Cisco IOS-XE configuration and troubleshooting from production networks.
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.
Most network engineers harden the data plane and forget the control plane, until an SNMP flood drops their OSPF adjacencies. This guide walks through a production-ready CoPP policy for Cisco IOS-XE, with real CLI templates, tuning guidance, and the show commands you need to verify it’s working.
QoS misconfigurations are the number-one cause of jittery voice calls and stuttering video in enterprise networks. This guide walks through a production-ready MQC QoS policy for Cisco IOS and IOS-XE, covering DSCP markings, LLQ, CBWFQ, NBAR2 classification, and the exact show commands you need to verify it’s working.
Stop logging into devices one by one. This hands-on guide covers Netmiko, NAPALM, and Nornir, the Python libraries that let network engineers automate Cisco IOS/IOS-XE tasks, parse show command output, push config changes, and run parallel jobs across hundreds of devices. Real code, real CLI examples, production-ready patterns.
BGP is the glue that holds the internet together, learn how it works, how to configure it on Cisco, and the security challenges it faces.
A deep dive into Cisco’s three operating systems, IOS, IOS-XE, and IOS-XR, their architectures, platforms, CLI differences, and when you’ll encounter each.
A hands-on guide to VLANs, what they are, why segmentation matters, and how to configure them on a managed switch with Cisco CLI examples.
A detailed comparison of Cisco Catalyst and Meraki for homelab use, covering cost, management, features, and which one actually makes sense for your setup.
My reference notes for recovering access to a Cisco ASR9000: lost local password vs AAA lockout, classic vs 64-bit IOS XR, config register 0x142 on single and dual RSPs, ROMMON config bypasses and cleanup, and the sysadmin-VM route on eXR.
