Interfaces & Modules

1. How to Fix: Cisco 9300 SFP Port Not Working
   Selene Gong

   58
   Unresponsive or non-working SFP (Small Form-Factor Pluggable) ports on Cisco Catalyst 9300 switches are a frequent challenge in enterprise network environments. Symptoms include ports showing a status of "down, notconnect" or no link light activity despite proper physical connections and basic ...
2. How to View Cisco CDP Neighbors from a Windows Client
   Selene Gong

   40
   What Is Cisco CDP and Why Is It Useful? Cisco Discovery Protocol (CDP) is a Layer 2 network protocol developed by Cisco to share information about directly connected Cisco devices, including device type, software version, IP address, and interface information. It helps network administrators ...
3. Cisco Command to See SFP Module: A Guide for Network Engineers
   Selene Gong

   40
   Small Form-Factor Pluggable (SFP) modules are essential transceivers used in Cisco switches and routers to connect devices via fiber or copper cables. Knowing how to view SFP module details helps network engineers verify installation, monitor performance, troubleshoot issues, and maintain ...
4. Extreme 5320 SFP Module Troubleshooting: Resolving Compatibility and Configuration Issues
   Selene Gong

   38
   For network administrators, IT engineers, and procurement managers overseeing enterprise-grade infrastructure, the Extreme 5320 Universal Switch Series is a reliable choice, providing high-performance, secure, and scalable network connectivity. However, when an Extreme 5320 fails to recognize an ...
5. What Is the Difference Between LX and LH SFP Modules? – 1G Optical Transceiver Guide
   Selene Gong

   40
   When selecting 1G optical transceivers, many engineers encounter confusing labels such as LX, LH, or even LX/LH. They often appear interchangeable in catalogs and compatibility lists—but are they actually different? Short answer:There is no fundamental technical difference between LX and LH ...
6. 3DS Stacking Technology: Sizing Samsung 256GB M321RBGA0B40-CWK vs SK Hynix HMCT14AEERA LRDIMMs
   Selene Gong

   18
   Quick Take Sizing 256GB DDR5 3DS RDIMMs requires balancing Samsung's 8-High TSV silicon density against SK Hynix's optimized packaging to prevent PMIC thermal throttling. Bypassing traditional multi-tiered distributor markups and utilizing agile sourcing channels is critical to maintaining ...