Removing settings 2821 Router

[CiscoLearner]

Ok, so please bear with me in this huge uphill climb that is the world of Cisco.

I have followed these instructions: https://www.youtube.com/watch?v=6EjqgURNfLM&feature=youtu.be 

to try and get some phones working with my CME router.   I needed a boost so thought I would follow the process and be pleased with myself when it all worked... Guess what it didn't.

Now I have lots of settings that I want to remove so I can get my CME enabled 2821 back to the vanilla flash files.  

I have a few problems, firstly how do I clear these interfaces:

Router#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
GigabitEthernet0/0         unassigned      YES NVRAM  up                    down
GigabitEthernet0/0.10      192.168.10.1    YES NVRAM  up                    down
GigabitEthernet0/0.20      192.168.20.1    YES NVRAM  up                    down
GigabitEthernet0/1         unassigned      YES NVRAM  administratively down down
GigabitEthernet0/1.20      unassigned      YES unset  administratively down down

Then I have the ephone settings that I need to clear dn settings and option 150.

Please be slow with me.  I'm going back to start I think.... Until I feel the need for that boost again. 

Thanks

[Georg Pauwen]

Hello,

to 'clear' the interfaces, use the 'default interface' command in global configuration mode, eg.:

2821#conf t

2821(config)#default interface GigabitEthernet0/0

Is that what you are after ?

[CiscoLearner]

Thanks - even after doing this the same interface settings remain the same

Router#show ip interface brief
Interface                  IP-Address      OK? Method Status                Protocol
GigabitEthernet0/0         unassigned      YES NVRAM  up                    down
GigabitEthernet0/0.10      192.168.10.1    YES NVRAM  up                    down
GigabitEthernet0/0.20      192.168.20.1    YES NVRAM  up                    down
GigabitEthernet0/1         unassigned      YES NVRAM  administratively down down
GigabitEthernet0/1.20      unassigned      YES unset  administratively down down

[Georg Pauwen]

Hello,

to remove the subinterfaces:

2821#conf t

2821(config)#no interface GigabitEthernet0/0.10

[CiscoLearner]

Thanks but still faces issues

Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#no interface GigabitEthernet0/0.10
                             ^
% Invalid input detected at '^' marker.

[BradEast1]

Are you just trying to clean up bits and pieces or reset to default? You could post the running-config (show run) and highlight what it is you want to remove and I will help you out. Or, if you want to start fresh just do "write erase" "reload".

[CiscoLearner]

Wow.. That's very kind thank you.

I have no idea what I have done but show run shows there to be no subinterface now.

Out of interest, if I had have used "write erase" and reload woudl that have removed the CME from the card or just back to default?

No doubt this will be the first of many cries for help. 

I do appreciate the replies.  Thanks

[Georg Pauwen · Accepted solution]

Hello,

'wr erase' deletes everything in NVRAM. NVRAM stores the running configuration, whereas CME is stored in flash, so CME wouldn't get touched...

[BradEast1]

Sometimes after deleting subinterfaces you have to save the config (wr me) and then "reload" for them to be removed from the show interface commands.

Please rate as helpful or resolved if you have no further questions.

[Georg Pauwen]

As far as I know, CME is stored in flash...?

Do a 'dir flash:' to see the contents. You can also do a 'dir nvram:' to see what's in there...

[Georg Pauwen]

Hello,

if you are new to Cisco and want to experiment, there are free tools such as Packet Tracer (from Cisco itself) and GNS3 (Open Source), which are very useful...they let you simulate various scenarios and configurations.

[Georg Pauwen]

Hello,

remove the IP address first, and then delete the subinterface...