To successfully establish an EtherChannel using Link Aggregation Control Protocol (LACP), one end must be in active mode while the other end can be in either active or passive mode. Configuring the peer switch with channel-group 1 mode passive allows it to respond to LACP negotiation initiated by the active side, forming a valid EtherChannel.
Using channel-group 1 mode on sets the port to a static EtherChannel without LACP or PAgP negotiation, which can lead to mismatched configurations and potential network issues. The commands channel-group 1 mode auto and channel-group 1 mode desirable are related to Port Aggregation Protocol (PAgP), not LACP, and are incompatible in this scenario.
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Cisco CCNA 200-301
Network Access
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