3750 Etherchannel Configuration Help

[Steven Stuart]

I have a stack cable connecting 4 3750's. I created 3 port channels 1,2, and 3. This will be my core switch stack with other racks connecting back to the core stack of 3750's. All my switches are 3750G switches in my network. My question is that I split up the channels logically for interface channel-group 1 goes to rack 1, group 2 goes to rack 2, and 3 goes to rack 3. When configuring the interfaces on the core will I choose the appropriate port group numbers to associate the interfaces to the port group? Will this work ok?

Maybe a configuration below will help with my idea?

interface Port-channel1

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel2

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel3

switchport trunk encapsulation dot1q

switchport mode trunk

interface GigabitEthernet1/0/2

description Connected to Rack1 Switch 1

channel-group 1 mode on

!

interface GigabitEthernet1/0/3

description Connected to Rack1 Switch 3

  channel-group 1 mode on

!

interface GigabitEthernet1/0/5

description Connected to Rack2 Switch 3

channel-group 2 mode on

!

interface GigabitEthernet1/0/6

description Connected to Rack2 Switch 5

channel-group 2 mode on

!

interface GigabitEthernet1/0/7

description Connected to Rack3 Switch 1

channel-group 3 mode on

!

interface GigabitEthernet1/0/8

description Connected to Rack3 Switch 3

channel-group 3 mode on

Will the interfaces channel groups be associated with the right port channel group I have setup?

Message was edited by: Steven Stuart

[IAN WHITMORE · Accepted solution]

Short answer to that is Yes.

Regards,

Ian

[Steven Stuart]

Thanks for that Ian. I read the documentation that Sunil sent me but that didn't quite make things clear. Hi John, to answer your question I have rack 1 with a stack of 4 3750's which is the core and another 4 stack of 3750's in rack 1. Rack two has a stack of 4 3750's and rack 3 the same as rack 2. After I set up everything I ran sh etherchannel summary and I was able to see that the ports were associated to the correct groups as I wanted them to be in. Thanks for the help guys.

[SunilKhanna]

Hi Steven,

Here is a good documentation on Etherchannel configuration. You might find it helpful.

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094647.shtml

Regards,

Sunil.

[JohnTylerPearce]

Steven I have a few questions for you.

Are you trying to do the following?

(3750 Stack of 4 Core Switch) ----> Rack 1

                                                ----> Rack 2

                                                ----> Rack 3

How many switches are in each stack from (Rack 1 to Rack 3)?