Cisco Etherchannel Overview and how it can be configured in Cisco Catalyst Switches – Series 8

Yasir Irfan Profile: Yasir Irfan

Now we are reaching towards the end of this series, one more post to go.  

Let’s proceed further and we will see how to configure a Layer 3 Etherchannel using the PAgp Protocol (Port Aggregation Protocol) in Cisco Catalyst Switches.

Here is the scenario which we will follow

From the above diagram we have two Cisco 3560 Catalyst Switches named ITKESW01 and ITKESW02.

We will configure a Layer 3 Etherchannel between the Cisco 3560 Catalyst Switches  ITKESW01 and ITKESW02. The  Giga Ethernet ports 0/45, 0/46/,0/47 & 0/48 on a Cisco 3560 Catalyst Switches  ITKESW01 are connected to Giga Ethernet ports 0/1,0/2,0/3 and 0/in Cisco 3560 Catalyst Switch  ITKESW02.

The configuration is as follows

Configuration in the Cisco 3560 Catalyst Switch  ITKESW01

ITKESW01#config t

ITKESW01(config)# interface port-channel 1

ITKESW01(config-if)# no switchport

ITKESW01(config-if)# no shutdown

ITKESW01(config-if)# ip address 192.168.1.1 255.255.255.0

ITKESW01(config-if)# end

ITKESW01#config t

ITKESW01(config)# interface range gigabitEthernet 0/45 – 48

ITKESW01(config-if-range)# no switchport

ITKESW01(config-if-range)# no ip address

ITKESW01(config-if-range)# channel-group 1 mode desirable

ITKESW01(config-if-range)#end

Note: This example shows how to configure Gigabit Ethernet ports 0/45 – 0/48   into port channel 1 with PAgP mode desirable

Note: The “no switchport” command is required to change interface from layer2 to layer3 mode.

Configuration in the Cisco 3560 Catalyst Switch  ITKESW02

ITKESW02#config t

ITKESW02(config)# interface port-channel 1

ITKESW02(config-if)# no switchport

ITKESW02(config-if)# no shutdown

ITKESW02(config-if)# ip address 192.168.1.2 255.255.255.0

ITKESW02(config-if)# end

ITKESW02#config t

ITKESW02(config)# interface range gigabitEthernet 0/1 – 4

ITKESW02(config-if-range)# no switchport

ITKESW02(config-if-range)# no ip address

ITKESW02(config-if-range)# channel-group 1 mode auto

ITKESW02(config-if-range)#end

Note: This example shows how to configure Gigabit Ethernet ports 0/1 – 0/4   into port channel 1 with PAgP mode auto

Note: The “no switchport” command is required to change interface from layer2 to layer3 mode.

Do use  “show etherchannel” command to display port-channel information after configuration and remember to save the configuration.

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