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ETHERCHANNEL CONFIGURATION


LAYER 3 ETHERCHANNEL

Spanning-Tree blocks redundant links and avoid Layer 2 loops. Etherchannels load balance the traffic between the redundadnt links and uses the bandwidth more efficient.

How can we configure etherchannel?

To understand more clear,  here is a basic etherchannel configuration scenario:

Here, two switches connected by four cable  from their gigabit ethernet ports. We will bundle four of the physical link into one logical link.

1. First of all, we must create logical interface with “port-channel” command and assign it an ip address. Before assigning an ip address, it is important to change this port to a Layer 3 port by “no switchport” command.

SW1 (config) # interface port-channel 1
SW1 (config-if) # no switchport
SW1 (config-if) # no shutdown
SW1 (config-if) # ip address 192.168.3.1 255.255.255.0
SW1 (config-if) # end

2. Next, physical interfaces must be configured.We must give “no ip address” command to not assign an ip address.Lastly we eill chose the mode.There are various modes for different etherchannel protocols.These protocols are PAgP and LACP. Here PAgP is used by “desirable” command.

SW1 (config) # interface range gigabitEthernet 0/1-4
SW1 (config-if-range) # no switchport
SW1 (config-if-range) # no ip address
SW1 (config-if-range) # channel-group 1 mode desirable
SW1 (config-if-range) # end

  • PAgP : Cisco proprietary.Modes: auto, desirable, on.
  • LACP : Standard based. Modes: active, pasive, on.
  • SW2 will be configured like above too with a different IP address.



LAYER 2 ETHERCHANNEL



For Layer 2 Ether Channel, there is no need to configure ip address. So only step 2 will be applicible.

Verification



SW1 # show interface fa 1/0 etherchannel

SW1 # show etherchannel 1 port-channel



ETHERCHANNEL LOAD BALANCING

SW1 (config) # port channel load-balance srt-dst-ip

SW1 # show etherchannel load-balance


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About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

One comment for “EtherChannel Configuration”

1
Arrantstonoum

Very intricate blog, father a super servant! Desing is cool!

January 9th, 2011 at 14:55

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