Verifying VLAN configurations on Cisco switches is crucial to ensure that VLANs are properly configured and functioning as intended. Here are some commands you can use to verify VLAN configurations:
### 1. Show VLANs:
Use the `show vlan` command to display information about configured VLANs on the switch, including VLAN IDs, names, and VLAN interfaces:
``` Switch# show vlan ```
### 2. Show VLAN Brief:
For a more concise view of VLAN information, you can use the `show vlan brief` command:
``` Switch# show vlan brief ```
### 3. Show Interface Status:
To see the VLAN membership and configuration of individual switch ports, use the `show interfaces status` command:
``` Switch# show interfaces status ```
### 4. Show Interface Switchport:
Use the `show interfaces switchport` command to display detailed information about switch port configurations, including VLAN membership, trunking status, and administrative mode:
``` Switch# show interfaces switchport ```
### 5. Show Trunk Ports:
To verify trunk port configurations and see which VLANs are allowed and active on trunk ports, use the `show interfaces trunk` command:
``` Switch# show interfaces trunk ```
### 6. Verify VLAN Database:
You can also check the VLAN database file stored in the switch's flash memory to ensure that VLAN configurations are saved correctly. Use the `show flash` command to view the contents of the flash memory:
``` Switch# show flash ```
### 7. Verify VLAN Configuration Revision:
Check the VLAN configuration revision number to ensure that it is consistent across all switches in the VTP domain. Use the `show vtp status` command:
``` Switch# show vtp status ```
### Conclusion:
Verifying VLAN configurations is essential for ensuring that VLANs are properly configured and functioning as expected. By using the commands mentioned above, network administrators can check VLAN configurations, membership, trunking status, and revision numbers to troubleshoot issues and maintain a stable and efficient network infrastructure.