Cisco AAA with TACACS+ and ISE: Centralized Authentication and Authorization for IOS-XE Devices
Learn how to configure centralized AAA on Cisco IOS-XE using TACACS+ and Cisco ISE 3.3.
Category: Networking
Computer networking, Cisco, routers, switches, and network infrastructure
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IPv6 on Cisco IOS-XE: Addressing, OSPFv3, Dual-Stack, and ACLs
A practical engineer’s guide to deploying IPv6 on Cisco IOS-XE: configure global unicast addressing, OSPFv3 routing, dual-stack interfaces, DHCPv6, named ACLs, and NDP — with real CLI output at every step.
DMVPN Phase 2 Configuration on Cisco IOS-XE: Hub-and-Spoke with Direct Spoke-to-Spoke Tunnels
A complete guide to DMVPN Phase 2 on Cisco IOS-XE: configure mGRE tunnels, IKEv2 IPsec, NHRP registration, OSPF next-hop preservation, and troubleshoot the most common failure modes including NAT traversal and dual-hub redundancy.
Cisco Catalyst 9000 IOS-XE Software Upgrade Guide: Avoiding the Gotchas
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.
CVE-2026-20182: Cisco Catalyst SD-WAN Auth Bypass Under Active Exploitation — Detection, Patching, and Hardening
CVE-2026-20182 is a CVSS 10.0 authentication bypass in Cisco Catalyst SD-WAN actively exploited by nation-state actor UAT-8616. With CISA Emergency Directive 26-03 issued, this guide covers the DTLS handshake flaw, attacker TTPs, detection commands, patching steps, and hardening requirements to protect your SD-WAN fabric.
Wireshark for Network Engineers: Essential Filters, Capture Techniques, and Cisco IOS-XE Integration
Master Wireshark for Cisco network troubleshooting. Covers BPF capture filters vs. display filters, Embedded Packet Capture (EPC) on IOS-XE, SPAN configuration, and real-world scenarios for BGP, OSPF, STP, and security anomaly analysis with actual IOS-XE CLI commands.
MPLS and L3VPN Configuration on Cisco IOS-XE: A Practical Engineer’s Guide
A step-by-step guide to configuring MPLS L3VPN on Cisco IOS-XE — covering LDP setup, VRF definitions, MP-BGP VPNv4, CE-PE routing, and verification with real show command output.
BGP Communities and Route Filtering on Cisco IOS-XE: A Practical Engineer’s Guide
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.
Spanning Tree Protocol (STP) and RSTP on Cisco IOS-XE: Configuration, Troubleshooting, and Best Practices
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.
AAA Authentication with TACACS+ and Cisco ISE on IOS-XE: The Complete Configuration Guide
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.
IPv6 Deployment on Cisco IOS-XE: A Practical Engineer’s Guide
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.
DMVPN Phase 2 Configuration on Cisco IOS-XE: Spoke-to-Spoke Tunnels Explained
DMVPN Phase 2 enables direct spoke-to-spoke tunnels on demand, bypassing the hub after the initial NHRP resolution. This complete IOS-XE guide covers mGRE tunnel setup, NHRP configuration, EIGRP next-hop-self pitfalls, IPsec with IKEv2, verification commands, and the most common deployment gotchas.