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Loopback Classful?

Christopher DobkowskiChristopher Dobkowski Member Posts: 98 ■■□□□□□□□□
in CCNA & CCENT
Hi there everyone! icon_cheers.gif

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



ok :D... I type in the command:

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

icon_cheers.gif

And what I get is that this is a: bad mask /24 for the ip 172.30.110.0... icon_surprised.gif
what the heck?! icon_sad.gif
Are loopback interfaces supporting classful subnet masks only? icon_scratch.gif
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    DPGDPG Member Posts: 780 ■■■■■□□□□□
    Check the last octet in your ip address.
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    Christopher DobkowskiChristopher Dobkowski Member Posts: 98 ■■□□□□□□□□
    Ummmm, nope icon_sad.gif still don't get it icon_sad.gif
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    DPGDPG Member Posts: 780 ■■■■■□□□□□
    The valid range for that subnet is .1 through .254.
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    Christopher DobkowskiChristopher Dobkowski Member Posts: 98 ■■□□□□□□□□
    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 icon_sad.gif was I suppose to know it already or what? icon_redface.gif

    Guess I need some reading about loopbacks icon_redface.gif

    So you can't assign.. omg.. i just figured that out... Thank you a lot!!!!! bowing.gifbowing.gifbowing.gif
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    jsb515jsb515 Member Posts: 253
    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.
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    oli356oli356 Member Posts: 364
    You tried to assign a network IP, therefore it's not valid.
    Lab:
    Combination of GNS3 and Cisco equipment if required.
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    JeanMJeanM Member Posts: 1,117
    oli356 wrote: »
    You tried to assign a network IP, therefore it's not valid.

    icon_cheers.gif
    2015 goals - ccna voice / vmware vcp.
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    IsmaeljrpIsmaeljrp Member Posts: 480 ■■■□□□□□□□
    Hey those errors only help us learn more. Good thing it's while you're studying . icon_lol.gif
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    Christopher DobkowskiChristopher Dobkowski Member Posts: 98 ■■□□□□□□□□
    Ismaeljrp wrote: »
    Hey those errors only help us learn more. Good thing it's while you're studying . icon_lol.gif

    True :picon_lol.gif
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