Missing VLANs

In this article we will discuss Missing VLANs, will make brief discussion on Missing VLANs, In last article we discuss about IP Addressing Issues with VLAN.

If there is still no connection between devices in a VLAN, but IP addressing issues have been ruled out, refer to the flowchart to troubleshoot:

Step 1. Use the show vlan command to check whether the port belongs to the expected VLAN. If the port is assigned to the wrong VLAN, use the switchport access vlan command to correct the VLAN membership. Use the show mac address-table command to check which addresses were learned on a particular port of the switch, and to which VLAN that port is assigned.

Step 2. If the VLAN to which the port is assigned is deleted, the port becomes inactive. The ports of a deleted VLAN will not be listed in the output of the show vlan command. Use theshow interfaces switchport command to verify the inactive VLAN is assigned to the port.

The MAC addresses that were learned on the F0/1 interface. It can be seen that MAC address 000c.296a.a21c was learned on interface F0/1 in VLAN 10. If this number is not the expected VLAN number, change the port VLAN membership using theswitchport access vlan command.

Each port in a switch belongs to a VLAN. If the VLAN to which the port belongs is deleted, the port becomes inactive. All ports belonging to the VLAN that was deleted are unable to communicate with the rest of the network. Use the show interface f0/1 switchport command to check whether the port is inactive. If the port is inactive, it is not functional until the missing VLAN is created using the vlan vlan-id global configuration command or the VLAN is removed from the port with the no switchport access vlan vlan-id command.

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