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A Switch can break the collisions domain but by default can't break the broadcast domains. How to break and control the broadcast domains in a switch?

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Question added by Saqib Mehmood , Technical Team Lead/Safety Supervisor , Xchange Technology Group
Date Posted: 2015/03/19
Osama Ismaeel
by Osama Ismaeel , Customer Solutions Architect - VPO (VPN Owner) , Orange Business Services

every switch port is collision domain ,,, in order to break broadcast domain Simply create Vlans, every Vlan is broadcast domain on the switch

Basit Javed Awan, BS, CCNA.
by Basit Javed Awan, BS, CCNA. , Field Maintenance Engineer , China Communication Services Saudi Arabia

Create VLANs to control broadcast domains

Biruk Hailemariam
by Biruk Hailemariam , System and Network Administrator , Yencomad Construction

By Creating VLAN on Layer2 Switch You Can Create Multiple Broadcast Domain But the Switch Has To Managed Switch Like CISCO

FAZIL ALI
by FAZIL ALI , IT Specialist | Team Lead – Network Security & Cloud Infrastructure , Holborn Assets

Simply VLAN- or Virtual LAN will solve this

Muhammad Anzar
by Muhammad Anzar , DevOps/DevSecOps Architect , Confidential

All the broadcast issues can solve through VLAN but your switch should be manageable switch

Ummer Ishtiaq
by Ummer Ishtiaq , Senior Network Administrator , i2c Incorporated

By creating VLANs !

Every VLAN you create, makes a separate broadcast domain.

Hi

 

Switches can segment broadcast domains by using VLANs. VLANs create separate broadcast domains running on the same physical hardware. 

Normally you would not want to do that. Broadcast are needed for proper IP connectivity as it is used by ARP. If you split broadcast domains you are breaking your networks down into IP subnets.

 

Some switches can offer broadcast/multicast storm control features which in my opinion would basically throttle the amount of traffic created by broadcasts. This will help you avoid DOS attacks causing network resources depletion (bandwidth and switch memory).

 

The main question is why do you have problems with broadcasts to begin with. If you have good control over the IT infrastructure you would expect that your clients (and I hope servers) would be trusted. However if you operate a public access network that is another story. VLANs & Subnets can be a solution here.

 

Ultimately the best place to protect your network is the edge. Gain control over your clients, use network admission control mechanisms that perform host checks (but those are rather pricey)

 

Cheers

 

Daneesh Viswanathan
by Daneesh Viswanathan , ICT Project Engineer , Salam Technology

Switches will not control the broadcast domain by default until implement  the segmentation.Creating vlans in a manageable switch will help you to create multiple broadcast domains in a single switch and assigning port vlan membership will help you to control the each broadcast domains.

Mohammed Alzubaidi
by Mohammed Alzubaidi , Network Engineer , King Abdullaziz University-Deanship of IT

I think its not possible using normal-layer2-switch (i.e. switch that doesn't support routing functions) as you need a router or a layer3 switch to break the domain. bottom line you need to have a layer3 device to achieve that 

Mohammed Farid
by Mohammed Farid , Senior Network Engineer , Ministry Of Media - Saudi Arabia

dividing the broadcast domains on the switch done by using VLAN 

هاشم المشارقة
by هاشم المشارقة , Key Account Manager , Advanced United Systems Ltd. ( A member of Taj Holding Group)

By using the VLANs configuration.

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