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I am setting up a new Cisco 3750 and need guidance on creating port-channel/etherchannel

Posted on 2014-01-27
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Last Modified: 2014-02-03
Hello EE,
I have a new 3750 and want to create a Port Channel and add a few switch ports to it.
Can somebody guide me on how to do this?  I see one that has a (D) but looking at mine I have Po6(SU) with Te1/1/1(P) and Te3/1/2(P) that I want to create identically in my new switch?
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Question by:bergquistcompany
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Craig Beck earned 500 total points
ID: 39813762
You should create the PortChannel interface first.  This is a virtual interface which will govern the physical interface configuration.

So, if you want a PortChannel which is configured to carry a single VLAN you'd do this...

interface Po2
 switchport
 switchport mode access
 switchport access vlan 10
!
interface range Te1/1/1 , Te3/1/2
 switchport
 switchport mode access
 switchport access vlan 10
 channel-group 2 mode active
!

Open in new window

This would put ports Te1/1/1 and Te3/1/2 in Po1 and allow VLAN10.

For a trunk you'd do something like this...

interface Po2
 switchport
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport trunk allowed vlan 10,30,50
 switchport trunk native vlan 100
!
interface range Te1/1/1 , Te3/1/2
 switchport
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport trunk allowed vlan 10,30,50
 switchport trunk native vlan 100
 channel-group 2 mode active
!

Open in new window


Note that the PortChannel interface number is the number you configure in the channel-group command in the physical interfaces.

When changing the configuration, adjust the PortChannel interface and the changes will filter down to the physical interfaces which form that PortChannel.

The channel-group command can use several modes.  These are:

active - enables LACP unconditionally
passive - enables LACP if an LACP device is detected
desirable - enables PAgP unconditionally
auto - enables PAgP if a PAgP device is detected
on - creates a static EtherChannel

You can use active/passive, or desirable/auto, active/active, auto/auto or on/on.

So, on one end of the link you might want to tell the switch to use PAgP no matter what.  That end would use channel-group 2 mode desirable.  The other end could use either auto or desirable, but not active, passive or on.

Make sense?
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Author Closing Comment

by:bergquistcompany
ID: 39831328
great details
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