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Community Member

Etherchannlel between switches

I have configured the stack and this is now working. Now I have the set up as in the diagram and want to configure etherchannel between the Cat 2960s and the stack as shown.

On the Cat 2960 SwA I have

Int g0/1

Switchport mode access

Switchport access vlan 2

Channel-group 1 mode desireable non-silent

Int g0/2

Switchport mode access

Switchport access vlan 2

Channel-group 1 mode desireable non-silent

On the Cat 2960 SwB I have

Int g0/1

Switchport mode access

Switchport access vlan 2

Channel-group 2 mode desireable non-silent

Int g0/2

Switchport mode access

Switchport access vlan 2

Channel-group 2 mode desireable non-silent

On the Cat 2960 SwC I have

Int g0/1

Switchport mode access

Switchport access vlan 2

Channel-group 3 mode desireable non-silent

Int g0/2

Switchport mode access

Switchport access vlan 2

Channel-group 3 mode desireable non-silent

Interface port-channel 1

Interface port-channel 2

Interface port-channel 3

On the Stack

I have

SwD/SwE

Int g1/0/49

Switchport mode access

Switchport access vlan

Channel-group 1 mode desireable non-silent

Int g2/0/1

Switchport mode access

Switchport access vlan 2

Channel-group 1 mode desireable non-silent

Int g1/0/50

Switchport mode access

Switchport access vlan 2

Channel-group 2 mode desireable non-silent

Int g2/0/2

Switchport mode access

Switchport access vlan 2

Channel-group 2 mode desireable non-silent

Int g1/0/51

Switchport mode access

Switchport access vlan 2

Channel-group 3 mode desireable non-silent

Int g2/0/3

Switchport mode access

Switchport access vlan 2

Channel-group 3 mode désirable non-silent

But it is not allowing me to to enter

Channel-group 3 mode désirable non-silent on SwD/SwE

It is rejecting it. How can I do this?.

Is the above a good way to connect these using etherchannel

Am I going the right way, and if now how else can I connect this?

Thanks

7 REPLIES
Purple

Re: Etherchannlel between switches

Won't work , you can't use PAGP to negotiate the channel when using crosstack etherchannel on the 3750's . You will have to use LACP or force the channels on in the 3750 .

On the 3750 and 2960's just use

channel-group X mode active

Community Member

Re: Etherchannlel between switches

Thank you

I will try this.

But please can you tell me if the design concept is right?

Me having 3 port channel to 3 of the 2960, is that correct?

Purple

Re: Etherchannlel between switches

Should work fine .

Community Member

Re: Etherchannlel between switches

I have put

channel-group 1 active on all the interfaces but it is still not working.

Please can you help?

Thanks

Community Member

Re: Etherchannlel between switches

I get this:

%With PAgP enabled, all ports in the Channel should belong to the same switch

Command rejected (Port-channel1, Gi1/0/49): Invalid etherchnl mode

Thanks

Purple

Re: Etherchannlel between switches

Use your original config with the changes shown.

Int g0/1

Switchport mode access

Switchport access vlan 2

Channel-group 1 mode active

Int g0/2

Switchport mode access

Switchport access vlan 2

Channel-group 1 mode active

On the Cat 2960 SwB I have

Int g0/1

Switchport mode access

Switchport access vlan 2

Channel-group 2 mode active

Int g0/2

Switchport mode access

Switchport access vlan 2

Channel-group 2 mode active

On the Cat 2960 SwC I have

Int g0/1

Switchport mode access

Switchport access vlan 2

Channel-group 3 mode active

Int g0/2

Switchport mode access

Switchport access vlan 2

Channel-group 3 mode active

Interface port-channel 1

Interface port-channel 2

Interface port-channel 3

On the Stack

I have

SwD/SwE

Int g1/0/49

Switchport mode access

Switchport access vlan

Channel-group 1 mode active

Int g2/0/1

Switchport mode access

Switchport access vlan 2

Channel-group 1 mode active

Int g1/0/50

Switchport mode access

Switchport access vlan 2

Channel-group 2 mode active

Int g2/0/2

Switchport mode access

Switchport access vlan 2

Channel-group 2 mode active

Int g1/0/51

Switchport mode access

Switchport access vlan 2

Channel-group 3 mode active

Int g2/0/3

Switchport mode access

Switchport access vlan 2

Channel-group 3 mode active

Purple

Re: Etherchannlel between switches

You would not put channel group 1 on all interfaces , follow your original config , instead of using channel-group X mode desirable use channel-group X mode active . Do you have physical links on all before starting this ? Also try to do both sides of the link as close together as possible , just input your commands on both interfaces at the same time useing the interface range command. Look in the logs and it will tell you why its not coming up .

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