Switches

1. Cisco C9300L-48P-4X-E vs C9300L-48T-4X-E: PoE or Data-Only?
   Selene Gong

   18
   Quick Take The C9300L-48P-4X-E and C9300L-48T-4X-E both provide 48 Gigabit copper ports and four fixed 10G/1G SFP+ uplinks. The main difference is PoE. Choose the 48P when the switch must power access points, IP phones, cameras, or other compatible endpoints. Choose the ...
2. Cisco N9K-C93180YC-FX3 vPC Configuration: Peer-Link, Keepalive, and Troubleshooting
   Selene Gong

   18
   Quick Take A Nexus vPC domain uses two separate mechanisms: the peer-link carries synchronization and required inter-peer traffic, while the peer-keepalive path confirms whether the other peer is alive. For an N9K-C93180YC-FX3 deployment, configure the vPC domain first, ...
3. Cisco Catalyst 9200/9300 QoS Queue Scheduling: Weighted Bandwidth, WTD, and Congestion Troubleshooting
   Selene Gong

   18
   Quick Take On Catalyst 9200 and 9300 switches, the search term “weighted round robin” usually refers to queue scheduling through commands such as bandwidth percent and bandwidth remaining percent. WTD controls when queued packets are dropped, while queue buffers ...
4. NVIDIA Mellanox SN2010 vs SN2100 vs SN2700: Rack Depth, Airflow, and Power Guide
   Selene Gong

   18
   Quick Take Choose SN2010 for dense 10/25GbE server access with 40/100GbE uplinks, SN2100 for compact half-width 40/50/100GbE switching, and SN2700 for high-density 100GbE leaf or spine deployments. Before ordering, verify the exact OPN, rack depth, airflow direction, PSU ...
5. What Equipment Is Needed for a RoCE Network? NICs, Switches, Cables, and BOM Checklist
   Selene Gong

   18
   Quick Take A production RoCE network requires RDMA-capable server adapters, RoCE-aware switches, compatible optics or cables, host drivers, switch QoS configuration, and a separate management path. Link speed alone is not enough; PFC, ECN, buffers, FEC, breakout mode, and ...