Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

lost interfaces on 2601

Recently during an IOS upgrade there was a power failure which resulted in the loss of the IOS and booting to Rommon. There was a bit of playing with registers and eventually the image was replaced using Xmodem and rebooted. Since then the router boots up correctly but no interfaces are available. They are missing from the Sho Ver / Sho run.

Please advise as to course of action to recover router.

Any suggestions greatly appreciated.

Many Thansk

12 REPLIES
New Member

Re: lost interfaces on 2601

Hi,

I would like to see the sh version output as well as the sh diag, it could be a problem with the MoBo (probably it got faulty during the outage and then no interfaces are recognized anymore), all the interfaces are down/down or a problem with the IOS you installed, please post this information in order to further assist you

New Member

Re: lost interfaces on 2601

Many Thanks for you assistance

Please see the4 sh Ver info

the Sho diag gave no results

sh ver

Cisco Internetwork Operating System Software

IOS (tm) C2600 Software (C2600-I-M), Version 12.0(28d), RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2005 by cisco Systems, Inc.

Compiled Fri 19-Aug-05 16:34 by pwade

Image text-base: 0x80008088, data-base: 0x80609A30

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

Router uptime is 5 minutes

System restarted by power-on

System image file is "flash:c2600-i-mz.120-28d.bin"

cisco 2600 (MPC860) processor (revision 0x101) with 20480K/4096K bytes of memory.

Processor board ID JAB03330APU (2113450968)

M860 processor: part number 0, mask 49

Bridging software.

X.25 software, Version 3.0.0.

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

Re: lost interfaces on 2601

This is really peculiar. Never seen it before in the way you describe it. I suppose this happens only rarely.

I would start with issueing the command: write erase, and then reload the router.

This will perhaps remove any corrupted data from nvram and let you re-enter the config.

If this does not help, could you please post the full output of the boot cycle?

Regards,

Leo

New Member

Re: lost interfaces on 2601

Please see Attached requested Info

many thanks

Larry_s

Re: lost interfaces on 2601

Your configuration register is set to the wrong value. This may verw well be the cause of your problems. To correct this, type the following on the console:

conf t

config-register 0x2102

end

Then reload the router and check what happens.

Regards,

Leo

New Member

Re: lost interfaces on 2601

Hi Iskinner,

Please find the Link on regisert setting and its meaning. I hope it will give some clarity.

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a008022493f.shtml

Regards...Mukesh

New Member

Re: lost interfaces on 2601

I will look into the Reg info

just some new info the Sho tech-Support gives no result for controlers, diags, and interfaces, the router has both a fast ethernet and 2 x wic-1t installed.

Silver

Re: lost interfaces on 2601

Hi ,

Can you try out the following steps.

Step 1 first change the configuration register value to 0x2102 using config-register 0x2102

Step 2 Hit Ctrl-Z to type end to quit from the editor.

Step 3 Type config terminal at the prompt.

Step 4 Type line con0

Step 5 at the Line con0 : please type the follwoing

Step 6 speed 9600

Step 7 Hit Ctrl-Z to type end to quit from the editor.

Step 8 then you must type write mem

Step 9 type reload

Please let me know the update.

Thanks,

Satish

New Member

Re: lost interfaces on 2601

the con0 had been set to to permit faster xmodem

i have changed the con0 to 9600 with no improvement. M

many Thansk

Silver

Re: lost interfaces on 2601

Hi ,

This is an intentional design of the 2600/3600. If the router let you set the configuration register to 0x2102, it would have changed the console speed from 115200 to 9600. At that point, you could be locked out of the router (if you did this in ROMMON, and were configured to boot to ROMMON, or had no IOS image in flash).

Therefore IOS masks the console speed bits from the conf-reg command to prevent the user from inadvertent console speed changes. Instead, you need to use the "speed 9600" command to change the console speed.

Are you seeing any messages when you are changing the console speed or trace back ?

Thanks,

Satish

Silver

Re: lost interfaces on 2601

Hi ,

Can you follow the procedure mentioned below.

Open the hyper terminal.

router>enable

router#conf t

router(config)#line con 0

router(config)#speed 9600

At this point the screen will go blank.

Close your hyperterminal session and re-establish at 9600bps

router(config)#exit

router#show run

(Check your configs are in running memory)

router#copy run start

(to save the config change)

router#show ver

(Checks config setting - it may say one of two things

"Configuration register is 0x2102" or,

"Configuration register is 0x3922 - will be 0x2102 at next reload"

please let me know the result.

Thanks,

Satish

Silver

Re: lost interfaces on 2601

Hi ,

Important thing is ***after changing the console rate and configuration register value*** you need to save the config using """WR MEM"" and boot the router.

Thanks,

Satish

218
Views
0
Helpful
12
Replies