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Webcast-Catalyst9k
New Member

Single VLAN

Is it possible to have Single VLAN support multiple subnets. For Example,

Create VLAN 10 and have multiple logical subnets 172.16.10.0/24, 172.16.20.0/24, and 172.16.30.0/24 tied to it.

I always thought that one vlan can only be tied to one subnet. If it is possible that what is the advantage.

2 REPLIES
Cisco Employee

Re: Single VLAN

You can..Just have secondary addresses on a router's interface for each subnet. It is a good design to have separate subnet for every VLAN

Re: Single VLAN

You can do that, after configuring secondary addresses on your router port the subnets will communicate each to the others,

BUT youare loosing:

a) security - All devices in each subnet can see another subnets traffic

b) bandwithh and CPU load - L2 broadcasts are bothering all devices in all subnets consuming their CPU.

I know only one reason for configuring this (temporary):

Moving from one address range to a new one.

Regards,

Milan

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