Switch – Linking two Dell switch stacks with LAG / LACP

lacplagswitch

Right now we have two independent switch stacks jointed with a single ethernet cable. For throughput and redundancy I would like to join them with a LAG. One switch stack is made up of Dell 7048's, the other is Dell 8132's (now called N4000 I believe). See diagram below.

switch diagram

I cannot for the life of me figure out how to create a LAG between these switches. The ports in question are all on the same subnet (marked blue in the diagram) so there is no VLAN tagging / trunking required, I think. I just want all the blue ports to behave as one switch. I also cannot figure out how and whether LACP comes into play.

Can someone please either provide me with specific instructions or guide me to a specific tutorial about what settings I should be using? I prefer using the web admin GUI but I do have serial access to the devices if need be. Any advice or guidance would be much appreciated.

Best Answer

In the GUI it's simple to create the LAG, check the below print screen. You need to add the port you need to the same group, by clicking and adding each ports.

enter image description here

Note: In the GUI when you create the LAG you can click to enable LACP, be advised that once the LAG is created you can't enable LACP without destroying the LAG first.

In the CLI: (without LACP)

console# configure

Enter configuration mode.

console(config)# interface range gi1/0/1-4

Enter interface-range configuration mode by entering the range of interfaces to be configured. Range command is optional.

console(config-if)# channel-group 1 mode on

Assign Group and mode static. This creates port-channel 1 as static LAG. The number is only relevant to this specific switch. Although it best practice to match the number on the corresponding switch for ease of management.

console(config-if)# end

Exit configure mode.

console# copy running-config startup-config

(Optional) Save your entries in the configuration file.

Don't forget to configure both switch.

Some reference: How to create Link Aggregation Groups (LAGs) on Dell Networking PowerConnect Switches

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