Refer to the exhibit. The EtherChannel is configured with a speed of 1000 and duplex as full on both ends of channel group 1. What is the next step to configure the channel on switch A to respond to but not initiate LACP communication?
A.
interface range gigabitethernet0/0/0-15 channel-group 1 mode on
B.
interface range gigabitethernet0/0/0-15 channel-group 1 mode desirable
C.
interface port-channel 1 channel-group 1 mode auto
D.
interface port-channel 1 channel-group 1 mode passive
Mode Passive:
The mode places a port into a passive negotiating state, in which the port RESPONDS to LACP packets that it receives, but DOES NOT initiate protocol negotiation.
This questions say that "SW A RESPOND, BUT NOT START LACP COMMUNICATION". Ask that "WHICH LACP MODE DOESN`T START COMMUNICATION?"
LACP modes -> Active/Passive.
Active -> Start Communication
Passive -> Doesn`t start Communication.
Correct Answer is "D".
Answer A is for Static EtherChannel. Meanwhile, the commands for answer D is not in order, at least not in a way that's acceptable in packet tracer. If they were, then , D would work.
S1(config)#int ran g0/1-2
S1(config-if-range)#int port
S1(config-if-range)#int port-channel 1
S1(config-if)#channel-g
S1(config-if)#channel-gr
S1(config-if)#?
arp Set arp type (arpa, probe, snap) or timeout
bandwidth Set bandwidth informational parameter
cdp Global CDP configuration subcommands
delay Specify interface throughput delay
description Interface specific description
duplex Configure duplex operation.
exit Exit from interface configuration mode
hold-queue Set hold queue depth
S1(config-if)#end
S1#
%SYS-5-CONFIG_I: Configured from console by console
"int po1" is a command to bring up the port channel interface, at first you use "etherchannel-protocol and ether-group mode " commands to create ether channel then at end you use int po1 command.
Like the guys said, the correct answer is D.
In the "On mode" LACP packets are NOT EXCHANGED, so there is NO LACP COMMUNICATION. This mode forces the interface to channel without LACP.
I think the correct answer is D as the questions mentions LACP that uses active or passive. Static etherchannel uses "on mode".
However, the command should be:
interface range gigabitethernet0/0/0-15
channel-group 1 mode passive
MODE ON: Mode that forces the LAN port to channel unconditionally. In the on mode, a usable
EtherChannel exists only when a LAN port group in the on mode is connected to another
LAN port group in the on mode. Because ports configured in the on mode do not negotiate,
there is no negotiation traffic between the ports. You cannot configure the on mode with
an EtherChannel protocol. If one end uses the on mode, the other end must also.
MODE PASSIVE:
LACP mode that places a port into a passive negotiating state, in which the port responds
to LACP packets it receives but does not initiate LACP negotiation. (Default)
We need Switch to respond to but not initiate LACP.
This means Passive.
For those saying A, we already read that the EtherChannel is configured, so we don't need to do all that. Also ON is neither LACP or PAGP. With ON, it will be created only when another interface group in EtherChannel "ON" mode.
Mate, just look at this:
c9200(config)#int po1
c9200(config-if)#chann
c9200(config-if)#chann?
% Unrecognized command
There is NO statement such "channel-group" inside the "int po1" command. You can only do this inside the interface(s). That's why A is correct while B is not responding the task.
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