Sammi,
You can always create VLANs without a router, you just can't move traffic
between them. If you have a situation where you have two networks that exist
in the same location but need to be kept strictly seperate (such as a
production and a test network) then it isn't necessarily a bad thing to
segregate the traffic. Usually there needs to be some form of communication
between VLANS though, so practically speaking you do need a router.
About the overlapping VLANs... Looks like you might have forgotten to take
into account the difference between classful and classless (VLSM)
addressing. Quick subnetting summary: if it says class x with ## bits of
masking then you add the ## of masking bits to the default subnet mask for
the address class. If it says x.x.x.x/## then the number of bits listed for
subnetting is the entire mask, not just the extra not included in the
default class mask. The first method is classful addressing, the second is
classless.
Remember, routers aren't very bright. They aren't smart enough to know that
network 10.200.x.x/16 is on VLAN 1 if the 3rd octet has a value of 1 and on
VLAN 2 if it has a value of 2. You need to tell it (via the subnet mask) the
entire network address, not just part of it.
Hope this helps,
Karen
*********** REPLY SEPARATOR ***********
On 4/30/2001 at 2:13 AM Sammi wrote:
>Still struggling with VLAN's and a basic question escapes me.
>If I create:
> VLAN1 as 10.200.1.x/16
>VLAN2 as 10.200.2.x/16 or /24
>I get "VLAN's overlap", which I assume is a bad thing (at least at my
>skill level, I understand you could use overlapped VLAN's).
>
>So, I'm confused how I can assign scopes to each VLAN, what the exact
>rules are. I'm starting to come to the conclusion I cannot use VLAN's
>without a router. Is that a correct assumption?
>
>Any help, tips, leads appreciated.
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