Loopback Classful?

Christopher Dobkowski

Hi there everyone!

I am doing a RIPv2 Lab and it says to create 3 loopback interfaces on R3 on the right, as so:



ok ... I type in the command:

R3(config)# int lo0
R3(config-if)# ip address 172.30.110.0 255.255.255.0



And what I get is that this is a: bad mask /24 for the ip 172.30.110.0...
what the heck?!
Are loopback interfaces supporting classful subnet masks only?

DPG

Check the last octet in your ip address.

Christopher Dobkowski

Ummmm, nope still don't get it

DPG

The valid range for that subnet is .1 through .254.

Christopher Dobkowski

DPG wrote: »

The valid range for that subnet is .1 through .254.

There is nothing written in the lab about choosing any ip in that network range as loopback was I suppose to know it already or what?

Guess I need some reading about loopbacks

So you can't assign.. omg.. i just figured that out... Thank you a lot!!!!!

jsb515

loopbacks are basically interfaces for ip testing and you don't even need to do no shutdown on them. I'm sure there are other uses for them i've just not hit them on my studies yet.

oli356

You tried to assign a network IP, therefore it's not valid.

JeanM

oli356 wrote: »

You tried to assign a network IP, therefore it's not valid.

Ismaeljrp

Hey those errors only help us learn more. Good thing it's while you're studying .

Christopher Dobkowski

Ismaeljrp wrote: »

Hey those errors only help us learn more. Good thing it's while you're studying .

True