High Availability Techniques: SSO, NSF, and Graceful Restart
A core router or switch reloading should not take the network down. In a well-designed high-availability platform, a
Labs
Hands-on Cisco IOS XE lab walkthroughs. Each lab ships with a real CML topology, configs you can paste, and verified show output. Articles tagged Labs cover the full CCNA 200-301 blueprint across Network Fundamentals, Network Access, IP Connectivity, IP Services, and Security Fundamentals.
Latest
QoS
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Hierarchical QoS: Shaping Parents and Queueing Children
A single flat QoS policy works fine until reality intrudes: you have a 100 Mbps physical interface but the carrier
QoS
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WRED and Congestion Avoidance: Dropping Packets on Purpose
The obvious way to handle a full queue is to drop whatever arrives once the queue is full. It is
QoS
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LLQ and CBWFQ on Cisco IOS XE: Building the Queueing Policy
When a WAN link congests, something has to give, and QoS is how you decide what. Left to itself, a
RESTCONF on Cisco IOS XE: GET, PATCH, and the YANG Path
If NETCONF is the powerful, ceremonious way to do model-driven management, RESTCONF is the friendly one. It exposes the
NETCONF on Cisco IOS XE Routers: A Hands-On Walkthrough
NETCONF is the protocol that replaced screen-scraping. Instead of sending CLI commands and parsing the text that comes back,
EEM Applets on Cisco IOS XE: Automate Config, Troubleshooting, and Data Collection
Before Python and NETCONF, before Ansible and Terraform, Cisco routers already had a way to automate themselves: the Embedded Event
VXLAN Deep Dive: VNIs, VTEPs, and the UDP Encapsulation
Every modern data centre fabric, and the campus fabric of SD-Access, is built on VXLAN. It is the technology
LISP Explained: Locator/ID Separation and Why Fabrics Use It
An IP address is doing two jobs at once, and that overload is the root of a surprising number of
Hardening the Management Plane on Cisco IOS XE
The management plane is how you reach and control your devices: SSH sessions, SNMP polls, NTP syncs, the VTY lines
Advanced ACLs on IOS XE: Time-Based, Object-Group, and IPv6 ACLs
The access list you learned for the CCNA (permit this host, deny that subnet) still works, but it does not
IPv6 First-Hop Security Part 2: ND Inspection, Snooping, and Source Guard
RA Guard and DHCPv6 Guard stop the loud attacks: rogue routers and rogue DHCP servers. But there is a quieter