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Webcast-Catalyst9k
New Member

Subnet question (two or more switches connected to eachother)

Hi.I read this somewhere  "The limitation of subnetting a network with a router is that all devices on that subnet must be connected to the same switch and that switch must be connected to a port on the router."

I thought only routers seperated broadcast domains when only one vlan Is enabled.Why can't I connect one switch to the router and the switches to eachother and put some devices on one switch and the rest on the other? If they're all on the same Vlan why would they have to be connected to one switch and why must that switch be directly connected to a router ?

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Hall of Fame Super Bronze

Subnet question (two or more switches connected to eachother)

It's not a well written article..

4 REPLIES
Hall of Fame Super Bronze

Subnet question (two or more switches connected to eachother)

I don't fully understand the question but in general a subnet is a subdivison of an IP network.

Say you have subnet 192.168.1.0/24 and that subnet is assigned to vlan 10 in the switch, all devices connecting to the switch must have their switchports configured for Vlan 10 in order to be part of that subnet.

You can extend the Vlan to other switches with a simply Layer2 trunk configuration.

If you want to connect to devices outside the subnet, you need a Layer3 device. A Layer3 device can be a Layer3 switch or an external routing device. Either device will be the boundary between subnets and broadcasts traffic will not traverse thru it.

New Member

Subnet question (two or more switches connected to eachother)

Thats how I understand It.It seems pretty straightforward.This Is the article containing the statement that confused me http://www.petri.co.il/csc_setup_a_vlan_on_a_cisco_switch.htm

Hall of Fame Super Bronze

Subnet question (two or more switches connected to eachother)

It's not a well written article..

New Member

Subnet question (two or more switches connected to eachother)

Thats good enough for me!

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