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MVP
Posts: 2,958
Registered: ‎10-25-2011

Big subnet and Vlan poolin

Okay let say i got  a big subnet a /22

 

and  i drop  broadcast  traffic and multicast  it doesnt matter how big is the subnet ? does it has performance issues even if i drop  Broadcast and multicast?  let say if i got a big broadcast domain like a /22 or /20? if they got performance issue which would be and why?

The vlan poolin does help with this... i know but im  just wondering becasue i read that bigger subnet are okay if you drop broadcast and mulsticast.

 

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Product Manager - Aruba Networks
Alternetworks Corp
Guru Elite
Posts: 20,821
Registered: ‎03-29-2007

Re: Big subnet and Vlan poolin

There is also ARP and DHCP renewal traffic that is still passed through, though, so you still want to watch the size of your subnet.

 



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

MVP
Posts: 2,958
Registered: ‎10-25-2011

Re: Big subnet and Vlan poolin

[ Edited ]

Collin Thanks for your reply like always!

i always use Vlan poolin when i can

I just wanted to understand what could happen if i did a big subnet  but did drop broadcast and multicast to help with the big subnet


Okay so besides that

1-DHCP renewal traffic in one Network

2-Arp  renewal traffic


Besides that in what else could a vlan poolin  be a better option?

I ask because  there are other wireless solution which does not have this feature but can do the drop broadcast and multicast and they claim its not necesary the vlan poolin cause of it.

 

And i was wondering if there something else i could say asides that?

Aruba does many things that the other cant but just focusing in this topic is there something else or that would be it?

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Product Manager - Aruba Networks
Alternetworks Corp
Guru Elite
Posts: 20,821
Registered: ‎03-29-2007

Re: Big subnet and Vlan poolin

- Devices in the same subnet contend for the same resources, whether it be for airtime, ARP, DHCP, etc, so those still need to be at a manageable size.

- In addition, problems are frequently confined to the same layer 2 subnet, so if you use multiple subnets, if you have a problem with a single subnet it can be isolated and you still have the use of the other subnets.

- If you use a single subnet and you have many devices with static addresses, you have many more devices to change if you decide to make a change later.

 

Even if we can assure that broadcasts will not be a problem, multiple subnets offers the best flexibility to be able to manage a network, period.



Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

MVP
Posts: 2,958
Registered: ‎10-25-2011

Re: Big subnet and Vlan poolin

Thanks for your words Collin! undersrtood! :)

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Product Manager - Aruba Networks
Alternetworks Corp
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