1. Interface and Port Status Include all physical and logical interfaces on the core switch, showing link status, speed, duplex, and error statistics. Use commands like show interfaces (Cisco/Juniper) to identify ports that are up, down, or flapping. Check for packet errors, collisions, or errdisable states, which may indicate cabling or hardware issues . 2. VLAN and Interconnection Details Document all VLANs configured on the core switch, including interconnection VLANs linking the core to distribution switches, firewalls, and BRAS devices. Include VLANIF interfaces and their IP addresses, ensuring each VLAN is bound to the correct VPN instance if applicable . 3. Routing and Protocols List all routing protocols configured on the core switch, such as OSPF or BGP. Include the status of routing interfaces, route tables, and gateway reachability. Ensure at least one IRB or management interface has a valid IP address and is reachable from the network . 4. Connectivity to Distribution and Access Layers Map the core switch connections to distribution switches, showing link aggregation, port density, and speed. Verify that distribution switches are correctly routing traffic to access switches and that redundancy mechanisms are in place to prevent link failures . 5. Traffic and Performance Metrics Include traffic statistics per interface, such as throughput, utilization, and error rates. Highlight any interfaces experiencing congestion or high error counts. This helps in proactive capacity planning and troubleshooting . 6. Physical and Cabling Checks Verify that all cables meet the required specifications (Cat5e/Cat6 for copper, SMF/MMF for fiber) and that transmit/receive pairs are correctly connected. Check LED indicators for link status and potential hardware issues . 7. Security and Segmentation Document any VPN instances, ACLs, or firewall interconnections that affect traffic flow through the core switch. Ensure public and private network routes are properly isolated .
Recommended Tools and CommandsA comprehensive Core Switch Connectivity Report provides a snapshot of the network backbone, highlighting interface health, VLAN and routing configurations, inter-layer connectivity, and performance metrics. Regularly generating this report ensures network reliability, quick troubleshooting, and informed capacity planning for enterprise or service provider networks .
Core Switch Vs Distribution Switch Vs Access Switch：What''s the difference？ Ethernet networks are expanding and their designs
This reference is intended for preliminary fiber optic adapter research. Compatibility, link budgets, connector interfaces, sleeve materials, polish, installation methods, test limits and applicable standards must be verified for the specific project.
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