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automatic broadcast domain creation ?

Greg_Wilson

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 ?

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Accepted answers

Mjizzini

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

All comments

Greg_Wilson

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

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

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

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..

Mjizzini

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

Fabian1993

@Mjizzini

any Plans from NetApp to disable that function? Maybe in the diag mode, is not cool for new Installations 😉