How to view core switch parameters
You can view core switch parameters using the switch's CLI commands in privileged EXEC mode to check interfaces, VLANs, forwarding rates, QoS, redundancy, and other operational metrics.
Accessing the Switch
- Connect to the switch via console, SSH, or Telnet.
- Enter privileged EXEC mode by typing
enableand providing the password if required .
Viewing Core Switch Parameters
1. Interface and Port Status
- Use
show interfacesto display all interfaces, their operational status, and errors. - For a specific interface:
show interface gigabitEthernet 1/0/1.
2. VLAN and MAC Table
show vlan brieflists all VLANs and their associated ports.show mac address-tabledisplays MAC addresses learned on each port.
3. Forwarding Rate and Performance
- Core switches handle high traffic; check forwarding capacity using
show processes cpuandshow memoryto monitor load. - Some switches provide
show platform hardware capacityorshow system resourcesto view forwarding rates .
4. Quality of Service (QoS)
show policy-map interfacedisplays QoS policies applied to interfaces.show mls qosprovides global QoS statistics .
5. Redundancy and Power
show redundancychecks the status of redundant supervisors or power supplies.show environmentdisplays fan and temperature status to ensure hardware redundancy .
6. Routing and ARP Tables
show ip routelists routing table entries.show arpdisplays ARP table entries for IP-to-MAC mapping .
7. 802.1X and Security
show dot1x allorshow dot1x interfaceprovides authentication status for ports using 802.1X .
Using Command Help
- Use
?after a command to see available parameters. For example,enable ?shows all options for theenablecommand . - This is useful for discovering additional parameters without consulting documentation.
Best Practices
- Always operate in privileged EXEC mode for full visibility.
- Regularly check interfaces, VLANs, QoS, and redundancy to ensure optimal core switch performance.
- Document configurations and monitor logs to detect anomalies early. By combining these commands, you can comprehensively view and monitor the parameters of a core switch, ensuring network stability and performance.
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