I believe the given answer is correct after running this through a lab.
SW2 in "auto" mode picks up on the fact that it's connections to SW1 are trunks and appears to form trunk based on negotiation as per the output below.
Port Mode Encapsulation Status Native vlan
Po1 auto n-802.1q trunking 1
The port channel does actually come up but with only one member, Gi0/0 on each side. Setting the port channel mode on SW2-Gi0/1 to active (LACP), the port is bundled into the port channel and everything works as expected. Therefore, I believe the answer to be D.
I just did this on an eve-lab and although my Port channel had sw mo trunk and dot1q encap configured my port channels did not come up until I applied it to the interfaces. I was using CML images so not sure if that made a difference. Im probably going with B.
Stupid question but I think it's B - when you configure etherChannel, the config has to match on both ends.
another thing to note is that 0/1 is set to passive on both ends and therefore it will not form etherchannel.
As you can see SW-2 is not set to trunk
Both interfaces on SW2 are running DTP, so with the remote interfaces being hardcoded as "Trunks" means DTP still runs in the background and causes SW2 interfaces to negotiate trunking.
Gig 0/1 in sw1 is set to passive mode, then Gig 0/1 on sw2 must be set to either trunk or active mode to establish a trunk link between these 2 opposite interfaces.
Correction, I meant that the interface's Gig 0/1 on sw2 LACP mode must be set to "active."
LACP works when at least one of the sides is set to active mode.
Labbed in CML
D is the answer.
SW2(config)#int g0/1
SW2(config-if)#channel-group 1 mode passive
SW2(config-if)#do show etherchan sum
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Gi0/0(P) Gi0/1(w)
After applying command in D
SW2(config-if)#channel-group 1 mode active
*Sep 12 14:13:08.444: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up
SW2(config-if)#do show etherchan sum
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Gi0/0(P) Gi0/1(P)
This is a very stupid scenario and a question out of this stupidity but the very first action to make this awfully configured port-channel work is to set one end of gig 0/1 as active.
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