How to view parameters of a core switch

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

1. Connect to the switch via console, SSH, or Telnet.
2. Enter privileged EXEC mode by typing enable and providing the password if required .

Viewing Core Switch Parameters

1. Interface and Port Status

• Use show interfaces to 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 brief lists all VLANs and their associated ports.
• show mac address-table displays MAC addresses learned on each port.

3. Forwarding Rate and Performance

• Core switches handle high traffic; check forwarding capacity using show processes cpu and show memory to monitor load.
• Some switches provide show platform hardware capacity or show system resources to view forwarding rates .

4. Quality of Service (QoS)

• show policy-map interface displays QoS policies applied to interfaces.
• show mls qos provides global QoS statistics .

5. Redundancy and Power

• show redundancy checks the status of redundant supervisors or power supplies.
• show environment displays fan and temperature status to ensure hardware redundancy .

6. Routing and ARP Tables

• show ip route lists routing table entries.
• show arp displays ARP table entries for IP-to-MAC mapping .

7. 802.1X and Security

• show dot1x all or show dot1x interface provides 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 the enable command .
• 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.