10-07-2018 09:55 PM
Finally, we are upgrading the LAN and we are going to use 3800 series Aruba switches. My question would be what is the downside of having a single big broadcast domain, let's say /17 for example. Some of the team members are not comfortable with big broadcast domain. Any input from the pros would be appreciated.
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10-07-2018 10:30 PM
Possible l2 issue could be very hard to troubleshoot in big broadcast domains.
Keep it small as you can, /24 /23 or max. /22 in most cases.
HPE ASE Flexnetwork | ACMP | ACCP | Ekahau ECSE Design - Was this post usefull, Kudos are welcome.
Re: Big Broadcast domain.
10-07-2018 11:20 PM
As your question is posted in the Wireless forum, it's not fully clear if you refer to wired or wireless clients in your question.
If you connect a controller (that does broadcast filtering/conversion) with many wireless clients, you should, in general, take the subnet as large as possible. Check the Single VLAN Architecture for WLAN VRD for more information and backgrounds.
In a pure-wired environment, I agree keeping the broadcast domains small (just a hundred or few hundred devices per VLAN) is considered best-practice for the reasons mentioned in the previous answer.
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