vlan problem

Unanswered Question
Jan 22nd, 2009

what is vlan?

if we have three vlans and pc1 in vlan1 and pc2 in vlan2

can pc1 see the pc2 or not

if pc1 can see pc2 what is the problem in the vlans

I have this problem too.
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Jon Marshall Thu, 01/22/2009 - 12:53

A vlan is a layer broadcast domain. So two devices in the same vlan can see each other without needing the presence of a router.

If you have 2 vlans and a device in each vlan then you need to route between the 2 vlans and for this you either need a router or a L3 switch.

Jon

lamav Thu, 01/22/2009 - 13:16

Just to add a bit to Jon's post, you can have more than one subnet in a vlan.

Take vlan 10.

interface vlan 10

ip address 10.10.0.0 255.255.254.0

The subnets for vlan 10 are:

10.10.0.0/24

10.10.1.0/24

A device with address 10.10.0.5 can reach 10.10.1.5 without the need of a router because they are in the same Layer 2 broadcast domain - in other words, in the same vlan.

HTH

engbandar Thu, 01/22/2009 - 15:35

A device with address 10.10.0.5 can reach 10.10.1.5

+if i want stop device see etch other what can do to stop this+

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