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AndrisK2006
Beginner

Cross Stack Etherchannel implementation steps ?

Hello,

I want Implement Cross Stack Etherchannel (cisco Catalyst 3750) for high availability. What is right implementation steps / order?

This is real production installation so I would like not to have any downtimes during / after implementation.

Cross-stack-etherchannel-existing.jpg

Cross-stack-etherchannel.jpg

Core1-1

Gi1/0/24

interface GigabitEthernet1/0/24

description trunk-between-cores

switchport trunk encapsulation dot1q

switchport mode trunk

no mdix auto

no cdp enable

end

Core2-1

interface GigabitEthernet1/0/24

description trunk-between-cores

switchport trunk encapsulation dot1q

switchport mode trunk

no mdix auto

end

Best regards,

Andris

7 REPLIES 7
Reza Sharifi
Hall of Fame Expert

Hi,

You config should work just fine.  You also need to add the second physical port to the portchannel and create the portchannel itself.  You will need an outage window to do this as when you move the existing link to a portchannle, there will be short down time.  don't forget to specify LACP or PAGP.  A good practice is to shut down the physical ports first than add them to the portchannel and than "no sh" on the portchannel to bring up the portchannel and the physical links.

HTH

Ok, that mean I need schedule short outage for my production systems.

Johnny.Stevenson
Beginner

Which IOS release are you using? Cross stack LACP only works after a certain 12.x release. Other than that, configure in the usual way for LACP. It will be disruptive though, the interfaces will bounce.

Sent from Cisco Technical Support Android App

Both Stacks are running 12.2(35)SE2 IOS version.

Johnny.Stevenson
Beginner

Interface g1/0/X

Swithport mode trunk

Swithport trunk allowed vlans all

Channel group 1 mode on

Repeat for other interfaces to be added to the etherchannel.

Interface Po1

Swithport mode trunk

Swithport trunk allowed vlans all

Sent from Cisco Technical Support Android App

Leo Laohoo
VIP Community Legend

How far are the two stacks from each other?

Not far , approximately 50 meters.