ACTIVE NEGOTIATION means "STARTING the negotiation process to create an EtherChannel link", and NOT waiting for someone else to start it.
There are two EtherChannel protocols: LACP (open standard) and PAgP (Cisco proprietary).
A. channel-group 10 mode on
The ON option doesn't enable negotiation (EtherChannel is always ON).
Wrong answer.
B. channel-group 10 mode auto
PAgP syntax, the AUTO option means PASSIVE negotiation (a device waits for a second device to start the negotiation).
Wrong answer.
C. channel-group 10 mode passive
LACP syntax, the PASSIVE option means PASSIVE negotiation (a device waits for a second device to start the negotiation).
Wrong answer.
D. channel-group 10 mode desirable
PAgP syntax, the DESIRABLE option means ACTIVE negotiation.
Correct answer.
E. channel-group 10 mode active
LACP syntax, the ACTIVE option means ACTIVE negotiation.
Correct answer.
D & E are correct
Desirable mode: Desirable mode in Port Aggregation Protocol (PAgP) initiates the negotiation and tries to form EtherChannel with other end.
Active Mode: Active Mode in Link Aggregation Control Protocol (LACP) initiates the negotiation and tries to form EtherChannel with other end.
Switch(config-if-range)#channel-group 1 mode ?
active Enable LACP unconditionally
auto Enable PAgP only if a PAgP device is detected
desirable Enable PAgP unconditionally
on Enable Etherchannel only
passive Enable LACP only if a LACP device is detected
It's not C and E because the question is asking what commands will actively pursue an etherchannel. Passive from LACP and auto from PAgP do not actively pursue an etherchannel, they will only join if someone is actively pushing for one, like active or desirable.
for LACP you would set #channel-group 1 mode active and the other side also as active or passive
for PaGP you would set it #channel-group 1 mode Desirable and the other side of the link Desirable or Auto
"negotiable" not "negotiate".
The answer is correct, though.
upvoted 2 times
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