etherchannel (LAG) on 2 2960

[Dragomir]

I got 2 2960s connected via port  gig 1/0/48

is it possible to create a portchannel on switch 1 port 1/0/22 and switch2 on port 1/0/41?

[Milos Megis]

Hi,
of course it is possible. Below is example (just other port numbers)

Switch 1:
interface FastEthernet1/13
channel-group 1 mode on
!
interface FastEthernet1/15
channel-group 1 mode on
!

It create new interface Port-channel1 with bandwidth equal of sum of BW from both interfaces.
You can check it with command: show interface Port-channel1. All next configuration must be then performed on this interface (Port-channel 1). I think VLAN assignment etc.

Switch 2:
interface FastEthernet1/10
channel-group 1 mode on
!
interface FastEthernet1/15
channel-group 1 mode on
!
It also create interface Port-channel 1.
Number of Port-channel interface is local significant and needn´t be same on both switches.
But interfaces in same etherchannel must have same channel-group.

You can verify configuration with show etherchannel ... commands

[Dragomir]

does it matter if these are not stacked switches? They are oly connected via 1/0/48

so I will need to put this command on both switches?

interface port-channel1

switchport access vlan 180

switchport mode access

[Prabath Godevithanage]

Hi,

I am sure Milos has replied on the base of a single switch or stacked switches.

Switches have to be stacked,If you wish to do cross-stack ether-channels or in other word ether-channels across stack members.functionality isn't available while they are daisy chained.

Please see here for more information ,Also there are minor restrictions with some of the protocol while used across stack members as well and you'd notice in the link

Cheers

Prabath

**Please rate all the useful replies appropriately**

[Milos Megis]

if they are not stacked then on physical ports type command channel-group.

According to number of channel group it will automatically create port-channel interface with this number.

And all another configuration like vlan assignment must be configured on port-channel interface.

So you group more physical interfaces into one logical interface and then you perform configuration like you have connected these logical interfaces with one cable. But bandwidth is sum of BW on physical interfaces.

Check link which was provided by Prabath. There you can find configuration examples.

[Dragomir]

shouldi use channel-group 1 mode on or active?

the switch its going to is a vmware distributed vswitch (vcenter)

[Milos Megis]

You can configure etherchannel manually and in this case you choose mode ON.

Also you have two dynamic protocols to form etherchannel.
LACP - define in IEEE 802.3ad which is supported on non-cisco devices
and
PaGP - which is cisco proprietary.

You can find more information here:
https://www.quora.com/What-is-difference-between-LACP-and-PAGP-protocol

If you want to enable etherchannel between two cisco switches you can use channel-mode ON.
If you want to enable etherchannel from switch to VMWare host, then try use dynamic protocol LACP.

[Dragomir]

I tried channel group 1 mode on and one link will not come up. 

[Milos Megis]

ok, so please send running configs of both switches and also which ports are connected together.