Refer to the exhibit.
An access point joins the secondary wireless controller but not the primary wireless controller. Another access point has joined the controller and is working fine.
The network engineer can ping the wireless controller and the access point from the core switch.
Which option is the cause of the issue?
A. The trunk ports are missing a spanning tree configuration.
B. The EtherChannel configuration is incorrect.
C. The port channels configured with the wrong negotiation protocol.
D. The trunk port configuration is incorrect.
B is correct because…
WLC1:
G0/0/1 –> g0/2
G0/0/2 –> g0/4
WLC2:
G0/0/1 –> g0/1
G0/0/2 –> g0/3
Switch:
Gi0/1 –> Channel group 1
Gi0/2 –> Channel group 1 (configure to channel group 2)
Gi0/3 –> Channel group 2 (configure to channel group 1)
Gi0/4 –> Channel group 2
Port Channel:
Group 1 –> Gi0/1 and Gi0/3
Group 2 –> Gi0/2 and Gi0/4
So you need to reconfigure switch ports Gi0/2 to channel group 2 AND Gi0/3 to channel group 1.
B is correct because…
WLC1:
G0/0/1 –> g0/2
G0/0/2 –> g0/4
WLC2:
G0/0/1 –> g0/1
G0/0/2 –> g0/3
Switch:
Gi0/1 –> Channel group 1
Gi0/2 –> Channel group 1 Channel group 2 Channel group 2
Port Channel:
Group 1 –> Gi0/1 and Gi0/3
Group 2 –> Gi0/2 and Gi0/4
So you need to reconfigure switch ports Gi0/2 to channel group 2 AND Gi0/3 to channel group 1.
GeorgeC have right
B is the correct answer:
The etherchannel configuration is incorrect:
Etherchannel 1 is configured for switch interfaces Gi0/1 and Gi0/2, and Etherchannel 2 is configured for switch interfaces Gi0/3 and Gi0/4
But if you look at the CDP neighbor output, you can see WLC1 on interfaces G0/2 and G0/4, and WLC2 on interfaces G0/1 and G0/3.
You can fix this configuring etherchannel 1 on ports G0/1 and G0/3, and etherchannel 2 on ports G0/2 and G0/4
Why B?