VLAN Overlapping - Don't Get it
Ok, I have a 1700 Switch with the FastEthernet 0/0 set as 10.10.10.1
If I create various VLANs, they give me the "hey buddy, it overlaps with Fastethernet 0/0" error if they are in the same
10.10.10.X range.
Naturally, I could define each of the VLANs and FastEthernet ports as 10.10.11.X and 10.10.12.X nets, but isn't there some way to have one or two of the FastEthernet ports in my basic 10.10.10.X networking scheme on this thing?
Clearly, I need some very basic knowledge here, but I don't understand why the additional VLANS couldn't be defined as unique 10.10.10.X addresses.
fa0/0 is a layer 3 port (router's built in port) and it cannot be tied to any vlan. Only fa0/1 through fa0/4 can be assigned to a vlan or make them a layer 3 port by using the command "no switchport".
int fa0/0
ip add 10.10.10.1 255.255.255.0
int fa0/1
ip add 10.10.20.1 255.255.255.0
no switchport
int fa0/2
switchport access vlan 3
int fa0/3
switchport access vlan 3
int fa0/4
switchport access vlan 3
int vlan 3
ip add 10.10.30.1 255.255.255.0
Now you have three subnets 10.10.10.0, 10.10.20.0 and 10.10.30.0.
The first subnet is tied to fa0/0 (router';s built in port)
The second subnet is tied to fa0/1 (the port fa0/1 has been made a layer 3 port using "no switchport" command)
The third subnet is tied to fa0/2,3 and 4 using a Layer 3 SVI interface (Vlan 3).
You should be able to route between these interface as long as PCs or other devices in each subnet are set with the right default gateway.
HTH
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