Interface administratively down

Unanswered Question
May 10th, 2011
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Hi all,

  I am configuring a 2801 router . I set up ip address on the interface Fa 0/0 and  'no shutdown' command. But, after a restart , the interface is changing to down  again!

  What I must do to ?

Thanks in advanced!

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Roman Rodichev Tue, 05/10/2011 - 14:06
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is it just down or admin down? if it's just down then it's down because there's no live ethernet connection, is it plugged into anything?

Roman Rodichev Tue, 05/10/2011 - 15:37
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If you do "show version" what does it say for configuration register, if it says something like 0xNN4N (where N is any number), then do these:

config t

config-register 0x2102

int fas0/0

no shut



write mem


Andre Albuquerque Tue, 05/10/2011 - 14:08
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You must save the configuration.

write mem


copy running-config startup-config


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