topic Re: Move e0M to default broadcast-domain in ONTAP Discussions

Move e0M to default broadcast-domain

Sebastian_Antunez — Wed, 04 Jun 2025 09:48:35 GMT

Hello Guys

I have the following problem

A two-node cluster was created, which is operational but in Network - Overview shows the e0M interface of controller-1 in broadcast domain Default and of controller-2 in broadcast domain Default-1

I need to know if it is possible to move the e0M of the controller located in Default-1 to Default and if they will have the cli command to do it.

Thanks for your help

Re: Move e0M to default broadcast-domain

Ontapforrum — Thu, 01 Jun 2023 15:17:03 GMT

Yes, please follow the kb for the commands.

Note: You cannot directly modify the IPspace on the given port; instead remove it from the current broadcast domain and then add it to the appropriate broadcast domain in the desired IPspace.

How to change the IP space or broadcast domain on a port:
https://kb.netapp.com/onprem/ontap/da/NAS/How_to_change_the_IP_space_or_broadcast_domain_on_a_port

Re: Move e0M to default broadcast-domain

Sebastian_Antunez — Thu, 01 Jun 2023 15:23:54 GMT

Hello

I have done this process before, but it is the e0M management port and it won't let me move it from broadcast domain.

Thanks

Re: Move e0M to default broadcast-domain

Ontapforrum — Thu, 01 Jun 2023 15:33:08 GMT

What is the error you see when you say it won't let me move ?

Check this kb:

Unable to add a port to broadcast domain - NetApp Knowledge Base

Re: Move e0M to default broadcast-domain

Sebastian_Antunez — Thu, 01 Jun 2023 16:07:20 GMT

Re: Move e0M to default broadcast-domain

Ontapforrum — Thu, 01 Jun 2023 18:14:57 GMT

Ok. Kb I mentioned deals with the error you have shared.

Re: Move e0M to default broadcast-domain

TMACMD — Fri, 02 Jun 2023 04:06:17 GMT

Have you tried to merge them?

Broadcast-domain merge -broadcast-domain Default-1 -into Default

Re: Move e0M to default broadcast-domain

TMACMD — Fri, 02 Jun 2023 04:13:48 GMT

That KB is seriously flawed.

Start with ... I am pretty sure the remove-port fails if there is a port that call the port trying to be removed "home". All that is being suggested is to migrate the port. I suspect the migrate needs to be done followed by a modify. Then the port can be removed from the BD.

Next, If I actually to ad a port to the Cluster BD, the port will take on the MTU of that BD (which would be 9000 and the example is showing 1500)

Finally, there should be some reference to removing the extra port...if e0c is no longer needed, it should be removed from the BD.

Re: Move e0M to default broadcast-domain

TMACMD — Fri, 02 Jun 2023 04:38:26 GMT

And this KB is also flawed. I run into this problem all the time. usually due to "properly" setting up broadcast domains (place all e0M in one BD and then have a BD with a tagged VLAN that happens to be the as the access ports that e0M is using...like a LIF on e0M (Access port VLAN 99) and another LIF on a0a-99 (VLAN port 99).

In my cases, when the new node joins the cluster a few things happen:

The node joins
the node-xx_mgmt LIF maintains the UUID (it does not get renamed)
the node e0M port cannot determine where to go since there are two broadcast domains that it can go into

Here is the fix, This usually is happening on a pair of new nodes:

Get a cable and link two unused ports together. This is the trick, the port MUST have a link. the port does NOT need to be connected to any real network, just a LINK. You cannot migrate a LIF to another port unless that port has a LINK. ANY port with a link works. Remember, this is temporary!
I will use e3a as an example. I connected a twinax between node-03:e3a and node-04:e3a
Add node-03:e3a and node-04:e3a to the same Broadcast-domain as node-01:e0M and node-02:e0M:
broadcast-domain add-ports -broadcast-domain Default -port node-03:e3a
broadcast-domain add-ports -broadcast-domain Default -port node-04:e3a
Modify the LIFs to use the temporary link (remember, the LIFs have a UUID at this point!)
net int modify -vserver myclus -lif f6d01922-0075-11ee-90ab-d039ea9b02dd_mgmt1 | 74af8691-0075-11ee-a1b7-d039ea9b3e72_mgmt1 -home-port e3a
Send the LIF home if needed: net int revert -vserver myclus -lif f6d01922-0075-11ee-90ab-d039ea9b02dd_mgmt1 | 74af8691-0075-11ee-a1b7-d039ea9b3e72_mgmt1 (the LIF may have AUTO-REVERT enabled and may go as soon as the port is changed)
Now you can add e0M to the broadcast-domain
Note: if the broadcast-domain containing the e0M ports is NOT called Default, you must rename the current Broadcast-domain to default to relocate e0M!
broadcast-domain add-ports -broadcast-domain Default -ports myclus-03:e0M,myclus-04:e0M
Modify/revert the LIF back to e0M
net int modify -vserver myclus -lif f6d01922-0075-11ee-90ab-d039ea9b02dd_mgmt1 | 74af8691-0075-11ee-a1b7-d039ea9b3e72_mgmt1 -home-port e0M
Send the lif home if needed: net int revert -vserver myclus -lif f6d01922-0075-11ee-90ab-d039ea9b02dd_mgmt1 | 74af8691-0075-11ee-a1b7-d039ea9b3e72_mgmt1
Rename the LIF if desired:
net int rename -vserver myclus -lif f6d01922-0075-11ee-90ab-d039ea9b02dd_mgmt1 myclus-03_mgmt
net int rename -vserver myclus -lif 74af8691-0075-11ee-a1b7-d039ea9b3e72_mgmt1 myclus-04_mgmt
Remove the e3a ports from the Broadcast Domain as they are no longer needed
broadcast-domain remove-ports -broadcast-domain Default -port node-03:e3a
broadcast-domain remove-ports -broadcast-domain Default -port node-04:e3a

Re: Move e0M to default broadcast-domain

Amador — Fri, 02 Jun 2023 12:59:37 GMT

I think this is explained at How to move a port from one broadcast-domain to another broadcast-domain while LIFs are using the port within ONTAP 9 - NetApp Knowledge Base