simple router question

[NettableWalker]

Hi Everyone,

I'm setting up a load of routers for a CCNP lab, am i right in thinking that you can basically have each ethernet port connected to the same Layer 2 switch if necessary (for convenience) and it will not cause any weird loops etc because it is all IP and a layer 3 situation?

eg, if you have a 172.16.0.1 and a 10.1.0.1 on the same switch they are essentially invisible to each other and a PC plugged inot the same switch would only be able to access each one if its address range was suitable.

Any thoughts?

 

[vipergg]

Incorrect it won't work if they are all in the same vlan on the switch . If you set multiple vlans on the switch and then connect each port to a separate vlan on the switch it would be fine otherwise you are going have conflicting address ranges and things won't work correctly . This is why you need a router to go between vlans . If you have a L2/l3 switch then that is different story in that everything cqan be programmed on the one switch to route between vlans .

 

[NettableWalker]

Vlan's don't come into it, it's just a test bed for routing. Instead of having wires going out of one interface and into others and cables everywhere, they are just plugged into the ports of a layer 2 switch.