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In three decades we went from shared 10 Mb hubs and beige pizza-box routers to leaf-spine fabrics pushing 400 GbE (and beyond), software-defined overlays, and AI-optimized data centers with liquid cooling and smart NICs. The big shifts: switches replaced hubs, virtualization and cloud changed traffic patterns, leaf-spine killed big L2 domains, EVPN-VXLAN became the standard overlay, copper gave...

Efficient network management is crucial for scaling and securing modern networks. Cisco Catalyst Center (formerly DNA Center) offers powerful tools for automating the deployment of device configurations using templates, composite templates, and Jinja2 scripting. In this guide, we will walk through creating and deploying templates, including interface configurations, NTP, SNMP, ACLs, and more, for...

OSPF is mostly used between a Core switch and downstream OSPF enabled devices like distribution switches, firewalls, etc. If the downstream device is connected via link aggregation to a Nexus vPC pair and vPC peer-gateway is configured, you will encounter OSPF adjacency flaps. This will not be noticed unless the OSPF adjacencies are monitored or debugged, so most engineers are not even aware that...