Configuring lacp port channeling

[Fabri_Fabri]

Hi,

I am trying to configure LACP through 2 Cisco switches 2960s.

This is my configuration:

SW1 & SW2

===========================

interface GigabitEthernet1/0/47
 description PORT_CHANNEL
 switchport access vlan 9
 speed 1000
 duplex full
 channel-protocol lacp
 channel-group 1 mode active
!
interface GigabitEthernet1/0/48
 description PORT_CHANNEL
 switchport access vlan 9
 speed 1000
 duplex full
 channel-protocol lacp
 channel-group 1 mode active

===========================

Will active on both sides be ok ?

Right now port-channel is configured this way:

interface Port-channel1
 description PC1
!

Does port-channel interface need to be configured regarding switchport and/or speed and/or duplex or is it related only to physical ports ?

Any help appreciated. Best regards.

[Reza Sharifi]

Hi,

Will active on both sides be ok ?

Yes, both sides can be configured as active

Does port-channel interface need to be configured regarding switchport and/or speed and/or duplex or is it related only to physical ports ?

You don't need to configure the Portchannel with speed and duplex, but you need to configured it as access or trunk.

HTH

[Fabri_Fabri]

Hi Reza, thanks for reply.

Do you think that this configuration will work ?

interface Port-channel1
 description PC1
 switchport access vlan 9
!

or this one is better ?

interface Port-channel1
 description PC1
 switchport mode access
 switchport access vlan 9
!

I also plan to set up both physical ports configuration and port-channel configuration the same way on both switches. Is it correct ?

Do you see any other errors in this config ?

Best regards.

[Reza Sharifi]

use this config

interface Port-channel1
 description PC1
 switchport mode access
 switchport access vlan 9

interface GigabitEthernet1/0/48
 description PORT_CHANNEL
 switchport access vlan 9
 speed 1000
 duplex full
 channel-group 1 mode active

it should work fine on all switches.

HTH

[Fabri_Fabri]

Can I ask you why you removed this line:

channel-protocol lacp

?

Is it implicitly activated using "active" ?

Thanks.

[Reza Sharifi]

Correct.  That is on optional command and the switch already knows what protocol you are using (in this case LACP) when you issue

channel-group 1 mode active

HTH

[Fabri_Fabri]

Thank you Reza, your help is greatly appreciated.

[Fabri_Fabri]

Hi,

turns out that DUPLEX FULL causes link to not work. I mean Layer1: sh interface reported link gi1/0/48 id down: line protocol is down.

Turning off duplex to auto on both sides immediately connected the links.

It is pretty strange isn't it ?

Last question: portchannel interface has to be access or trunk ? I need only 1 vlan.

Thanks.

[satishpadhy]

i also similar problem , i m trying to connect 3945 router with HP Switch. router gives when mode active used

interface Port-channel1
 no ip address
 hold-queue 150 in
!
interface Port-channel1.255
 encapsulation dot1Q 255 native
 ip address 191.168.1.1 255.255.255.0

interface GigabitEthernet0/0

description Uplink to <Switch name> Gig1/0/x

no ip address

duplex full

speed 1000

channel-group 1 mode active

interface GigabitEthernet0/1

description Uplink to <Switch name> Gig2/0/x

no ip address

duplex full

speed 1000

channel-group 1 mode active

[Madhukrishnan Gopinathan Nair]

What is the problem you face with it?

[satishpadhy]

mode active doesn't take the command hence port channels are not working.
 

[Madhukrishnan Gopinathan Nair]

I m not from the routing team, but i have a feeling if the command is not accepted , then it may be that you don't have the required license for that.  But i am not 100% sure.

As a work around you may configure it as mode "ON" .

Madhu.

[satishpadhy]

actually no option either for mode active or ON. Does 3945 supports LACP ?

(config-if)#channel-group 1 on
                                      ^
% Invalid input detected at '^' marker.

[Steve Fuller]

Duplicate. Also posted to Port Channel configuration in 3945 router for LACP not working.

Regards