200-301 Question 206
Select 4You are tasked to configure an EtherChannel between two switches using LACP. After completing the configuration, you notice the EtherChannel is not forming, and the ports remain in the 'inactive' state. Which of the following steps should you verify to troubleshoot this issue?
- A
Confirm that the ports on both switches are configured with the same speed and duplex settings.
- B
Verify that the LACP mode on one switch is set to 'active' and on the other switch is set to 'passive'.
- C
Ensure that the EtherChannel group numbers are the same on both switches.
- D
Check if the connected interfaces belong to the same VLAN if they are in access mode.
- E
Verify that the EtherChannel is configured as Layer 3 by assigning an IP address to the port channel interface.
Show answer and explanation
Correct answers: A, B, C, D
Explanation
When configuring EtherChannel using LACP, certain conditions must be met for the channel to form successfully. These include matching speed and duplex settings, compatible LACP modes, consistent EtherChannel group numbers, and correct VLAN configurations for access ports. Ensuring these settings are correct will allow the EtherChannel to form and operate as expected. Assigning an IP address to the port channel interface is only necessary for Layer 3 EtherChannel, which is unrelated to troubleshooting the basic formation of the EtherChannel.
- A. Correct.
EtherChannel requires all participating ports to have matching speed and duplex settings to form a channel.
- B. Correct.
For LACP to form an EtherChannel, one side must be set to 'active' while the other side can be 'active' or 'passive'; both cannot be in 'passive' mode.
- C. Correct.
The EtherChannel group numbers must match on both switches to logically aggregate the correct ports.
- D. Correct.
If the interfaces are in access mode, they must belong to the same VLAN; mismatched VLANs will prevent the EtherChannel from forming.
- E. Incorrect.
Assigning an IP address to the port channel interface is only required for Layer 3 EtherChannel. However, this step is not relevant to troubleshooting the formation of the EtherChannel itself.