Last Updated on August 1, 2021 by Admin 2
You have executed the following set of commands on a Layer 3 switch:
You have verified that the configuration on all the physical and logical interfaces is correct. All the Layer 2 interfaces configured on the switch are in the up/up state.What is the state of the VLAN and the line protocol when you execute the show interfaces vlan 5 command?
- administratively down/down
- down/down
- up/up
- up/down
The VLAN and the line protocol are in the up/up state when you execute the show interfaces vlan 5 command. You can view the state of the VLAN and the line protocol using the show interfaces vlan command, which is as follows:
switchA# show interfaces vlan 5 Vlan5 is up, line protocol is up Hardware is Ethernet SVI, address is 031B.70A2.166F (bia 031B.70A2.166F) Internet address is 10.33.3.1/24 <output omitted>
As you can see in the given output, the text Vlan5 is up, line protocol is up indicates that VLAN 5 and the Layer 2 line protocol both are in the up state. Both the VLAN and line protocol are in the up/up state if the following conditions are true:
The VLAN is configured on the switch and is enabled in the VLAN database
The VLAN is not in the administratively down state
The VLAN has at least one Layer 2 (access or trunk) port in the up state
The VLAN and the line protocol will not be in the administratively down/down state. An interface is in the administratively down state only when the shutdown command is used on that interface. In this case, the no shutdown command is used on the VLAN 5 interface, not the shutdown command. The no shutdown command enables the VLAN 5 interface.
The VLAN and the line protocol will not be in the down/down state. An interface is the down state when there is some Layer 1, Layer 2, or Layer 3 problem such as incorrect cabling used or an incorrect IP address assigned. Interfaces can also be in the down state if the either of the interfaces at the end of a link is in down state due to erroneous configuration. However, in this case, the configuration is correct and the VLAN 5 is in the up state because of the no shutdown command.
The VLAN and the line protocol will not in the up/down state. An interface is the down state when there are some Layer 1, Layer 2, or Layer 3 problems such as incorrect cabling used or an incorrect IP address assigned. In Layer 3 switches, line protocol will be in the down state if all of the Layer 2 ports in the VLAN are in the down state. In this case, the configuration is correct and all the ports in VLAN 5 are in the up state. This implies that that the line protocol cannot be in the down state.
Objective:
Layer 2 Technologies
Sub-Objective:
Configure and verify VLANs