The Cisco proprietary negotiation for EtherChannel is known as Port Aggregation

Protocol (PAgP). PAgP is enabled by enabling a channel in either the 'auto' or

'desirable' mode. When an interface runs PAgP in auto mode it will listen for

PAgP packets received on the interface and agree to negotiate once these

packets are received. An interface in auto mode will not initiate negotiation

through PAgP. When an interface runs in desirable mode it will initiation PAgP

negotiation.

The open standard for EtherChannel negotiation is Link Aggregation Control

Protocol (LACP), and is defined in IEEE 802.3ad.

To disable both PAgP and LACP, set the channel mode to 'on'

please, if helpful Rate