VLAN 1 Administratively down, protocol down

Answered Question
Sep 13th, 2010
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Good day,


I have a 3560 switch and connections are fine, but the mgmt interface, VLAN1, is down since we did a passwd recovery. Is this somehow caused by the autostate feature? I don't have any other VLANs and besides one trunk I am using as simple a setup as I can..


Other details:

I have had ports going into disabled state and I may have had flapping between the trunk ports (misconfigured?) that is disabling them... not sure yet. We've just been re-enabling them in the GUI and looking into the "errdisable recovery" auto-recovery timer for disabled ports.



Any help is much appreciated.


Thanks,

A

Correct Answer by darren.g about 6 years 8 months ago

A port which is "Administratively down" means that the "shutdown" command has been issued on that port.


You should simply be able to re-enable it by logging on to the switch and doing the following


switch#conf t

switch(config)#int vlan1

switch(config-if)#no shut

switch(config-if)#end

switch#copy run start


This should bring the interface up and save that state for the next switch restart.

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Reza Sharifi Mon, 09/13/2010 - 14:48
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Hi,


what does "sh ip int bri vlan1" shows?

also do a "no sh" on vlan 1 and test again.

Can you post the output of  "sh run interface vlan 1"?



HTH

Reza

Leo Laohoo Mon, 09/13/2010 - 15:07
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Is this somehow caused by the autostate feature?

In some IOS, VLAN 1 is "shutdown" by default.  Enable this with the "no shutdown" interface command.
Correct Answer
darren.g Mon, 09/13/2010 - 18:49
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A port which is "Administratively down" means that the "shutdown" command has been issued on that port.


You should simply be able to re-enable it by logging on to the switch and doing the following


switch#conf t

switch(config)#int vlan1

switch(config-if)#no shut

switch(config-if)#end

switch#copy run start


This should bring the interface up and save that state for the next switch restart.

sloman61 Tue, 09/21/2010 - 12:26
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Darren - Thanks for the very succinct answer - that did it! I thought I had already done a no shut, but I must've done it on the wrong interface or something..?!


Anyway, it took me a while to be able to access the switch again due to constraints here, but its good to get that done.. finally!


Thank you very much!

A

darren.g Tue, 09/21/2010 - 14:59
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No problems.


You mentioned this occured after you performed a password reset procedure - it's been a long time since I've had to reset passwords on a Catalyst, but from memory part of the process tells you you have to run a 'no shut' on all interfaces, because part of the password reset process shuts them all down by default.


I could be wrong on this one, though. Like I said, it's been a long time since I had to do a password reset.


Cheers.

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