EtherChannel

EtherChannel Management Protocols: To manage EtherChannel connections, there are two types of PAgP and LACP protocols:  PAgP: The Port Aggregation  Protocol is a Cisco exclusive protocols, and if we can use this protocol to have the equipment on both sides connect to Cisco And the task of this protocol is to manage and set up the etherChannel channel. LACP: Based on Link Aggregation Control Protocol,  this protocol is not related to a specific company but is supported by Cisco and other companies, and if our equipment relates to different companies, we can use this protocol to communicate. EtherChannel: on:  This mode enables EtherChannel to be enabled on the interface without sending any LACP and PAgP messages. 

auto:  In this fashion, no PAgP messages are sent from the interface, but are ready to respond to PAgPP messages from the opposite switch and can not start PAgP Negotiation. 
desirable:  In this mode of interfaces, create PAgP messages and forward to the opposite switch and be able to begin PAgP Negotiation. 
passive:  In this fashion, no LACP messages are sent from the interface, but are ready to respond to PAgPP messages by the switch and can not start the LACP Negotiation. 
active:  In this mode, the interfaces create LACP messages and forward to the opposite switch and are able to start the LACP Negotiation. 

The scenario configuration shown in the screenshot below is for EtherChannel

Image

Step 1: Configure the EtherChannel Virtual Interface on Switch 1 (SW-1): 

SW-1 # Config t
SW-1 (config) #interface Channel-Group 1
SW-1 (config-if) #exit

Step 2: Put the physical physical interfaces in the EtherChannel virtual interface I created in the previous step.  
At this point, I intend to put the 13-16 interfaces in the Channel-Group 1 group that I created in the previous step: 

SW-1 # config t
SW-1 (config) #interface range fastethernet 0/13 - 16
SW-1 (config-if) # channel-grope 1 mode is desirable

Step 3: Configure the EtherChannel Virtual Interface on Switch 2 (SW-2): 

SW-2 # Config t
SW-2 (config) #interface Channel-Group 1
SW-2 (config-if) #exit

Step Four: Put the physical physical interfaces in the EtherChannel virtual interface I created in the previous step.  
At this point, I intend to put the 13-16 interfaces in the Channel-Group 1 group that I created in the previous step: 

SW-2 # config t
SW-2 (config) #interface range fastethernet 0/13 - 16
SW-2 (config-if) # channel-grope 1 mode auto

After completing the configuring of the switches and ensuring that the configuration we have done, we can now test the connection between the networks connected to SW-1 and SW-2. 

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