| Exam 300-115 | Question id=1309 | Layer 2 Technologies |
After an EtherChannel is configured between two Cisco switches, interface port channel 1 is in the down/down state.
Switch A is configured with channel-group 1 mode active, while Switch B is configured with channel-group 1 mode desirable.
Why is the EtherChannel bundle not working?
| A. |
The switches are using mismatched EtherChannel negotiation modes. | |
| B. |
The switch ports are not configured in trunking mode. | |
| C. |
LACP priority must be configured on both switches. | |
| D. |
The channel group identifier must be different for Switch A and Switch B. |
Here we have a situation where one switch is using active mode, which is an LACP mode, and the other is using desirable, which is a PAGP mode. You can not mix the LACP and PAGP protocols to form an etherchannel. Here is a summary of the various etherchannel modes: