Solved: Re: automatic broadcast domain creation ?

Greg_Wilson · ‎2021-07-12

We have 2 new clusters running 9.8P5

Seems when you plug a network cable in it now automatically creates a new broadcast domain for that port.

Default Default 1500 xx-xxxxxx-xxx02-01:e0M complete
Default-1 1500 xx-xxxxxx-xxx02-02:e0M complete
Default-2 1500 xx-xxxxxx-xxx02-01:e1a complete
Default-3 1500 xx-xxxxxx-xxx02-02:e1a complete

Is this a new feature or a bug, why not just keep it in Default ?

Mjizzini · ‎2021-07-26

It will create a new broadcast domain for every reachable layer2 network.

i recommend configuring the ports on the switches before attaching them with cables.

Example of using broadcast domains

View solution in original post

Greg_Wilson · ‎2021-07-12

Its also doing the same thing for failover groups.

broadcast-domain show -ipspace Default
(network port broadcast-domain show)
IPspace Broadcast Update
Name Domain Name MTU Port List Status Details
------- ----------- ------ ----------------------------- --------------
Default Default 1500 xxx-01:e0M complete
Default-1 1500 xxx-02:e0M complete
Default-2 1500 xxx-01:e1a complete
Default-3 1500 xxx-02:e1a complete
4 entries were displayed.

Fabian1993 · ‎2021-07-13

Hi @Greg_Wilson,

start with ONTAP 9.8 ONTAP will automatically create Broadcast Domains, also based on Layer 2 reachability.

You can read this here:

https://docs.netapp.com/us-en/ontap/networking/example_of_using_broadcast_domains.html

Greg_Wilson · ‎2021-07-13

So why does it create a seperate BD for each port ?

Surely you want e0M(management ports) on all clusters to be in the same BD ?

Fabian1993 · ‎2021-07-13

The system automatically creates any additional broadcast domains during cluster initialization based on layer 2 network reachability. These additional broadcast domains are named Default-1, Default-2, and so forth.

For each Port makes really no sense, in Praxis build the Broadcast Domain by your self..

Maybe than one from NetApp could give us more detailed Information..