Re: Config-register???? [7:54632]
Shawn, There one other "gotcha" where the "break enabled" bit 8 of the config-register can bite you. You are correct that having break enabled and having a console device connected could be dangerous because someone could inadvertently send a break sequence and drop the router into Rommon. Be aware that NOT having a console device connected could be even more dangerous. In a significant number of instances where bit 8 was left "off" in a router, (0x2002) I have seen the router drop into Rommon when a console device was connected to the console interface! It turns out that a "break sequence" can be very closely approximated by the "noise" generated in plugging or unplugging the console cable! There was even one report of an extended console cable in a large "NOC" that was plugged into a console and laying on the floor that was ultimately linked to a Core router intermittently dropping into Rommon. All I can report for certain is that once this cable was removed from the console connection on the router, the problem disappeared. There are a very limited set of circumstances where having the "break enabled" is a viable configuration on a Cisco router used for production. :-( I actually had one person tell me that he left the break enabled so that he could regain control in the eventuality that his routers went berserk. I tried to point out that if he was close enough to be connected to the console in that scenario, he could probably manage to flip the power switch instead. :-P I'm not certain the message got through,,, :-D Bruce Shawn Heisey wrote: Mark, Actually, the 'break disabled' is the default setting. It means that after rommon passes control to the IOS, you can't issue a break to get back to rommon. You can always issue the break before control is passed to IOS, regardless of this setting. If you turn this setting off, you can send a break at any time to get to rommon -- even after the router is up and running. This can be a Very Bad Thing (tm), especially if you leave something connected to the console port all the time. Thanks, Shawn "Mark W. Odette II" wrote: Set your terminal app's baud rate to 19200 and see if that doesn't fix ya. Also, according to the nifty Config-Register calculator (from Boson's website), the Break Key is disabled. So, you'll need to let the router boot normally, and then, via the console, go into config mode and change the config register to your desired setting. HTH's Mark -Original Message- From: Frank Lodato [ mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 01, 2002 10:10 AM To: [EMAIL PROTECTED]Subject: Config-register [7:54632] I broke in to a Cisco 2600 router today, but I didn't have access to my handy sheet that tells me exactly what config-register setting to type in. Instead of 0x2142 I put 0x2124. Now when I hard bott the router it gives me'JJJ^^' . Now, I've never seen this before so I'm very confused as to what to do next. I can't really type anything either so it wont take commands that I know. What did I do? How can I fix it? Help! -- Bruce Enders Email: [EMAIL PROTECTED] Chesapeake NetCraftsmeno:(410)-757-3050, c:(443)-994-0678 1290 Bay Dale Drive, Suite 312 WWW: http://www.netcraftsmen.net Arnold, MD 21012-2325 Cisco CCSI# 96047 Efax 443-331-0651 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54749&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Config-register???? [7:54632]
Ya know, I never knew that about the Break enable/disable. Learn something new every day. So, is this Break Enabled setting similar to the function with Sparc platforms issuing the Stop-A key sequence? Suddenly I realize just how Unix-like the Cisco routers are, not that I didn't already know that :) Thanks for clearing that up. Don't I feel like a dolt. Mark -Original Message- From: Shawn Heisey [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 01, 2002 2:05 PM To: Mark W. Odette II Cc: [EMAIL PROTECTED] Subject: Re: Config-register???? [7:54632] Mark, Actually, the 'break disabled' is the default setting. It means that after rommon passes control to the IOS, you can't issue a break to get back to rommon. You can always issue the break before control is passed to IOS, regardless of this setting. If you turn this setting off, you can send a break at any time to get to rommon -- even after the router is up and running. This can be a Very Bad Thing (tm), especially if you leave something connected to the console port all the time. Thanks, Shawn "Mark W. Odette II" wrote: > > Set your terminal app's baud rate to 19200 and see if that doesn't fix > ya. > > Also, according to the nifty Config-Register calculator (from Boson's > website), the Break Key is disabled. So, you'll need to let the router > boot normally, and then, via the console, go into config mode and change > the config register to your desired setting. > > HTH's > Mark > > -Original Message- > From: Frank Lodato [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, October 01, 2002 10:10 AM > To: [EMAIL PROTECTED] > Subject: Config-register [7:54632] > > I broke in to a Cisco 2600 router today, but I didn't have access to my > handy sheet that tells me exactly what config-register setting to type > in. > Instead of 0x2142 I put 0x2124. Now when I hard bott the router it > gives > me'JJJ^^' . > Now, I've never seen this before so I'm very confused as to what to do > next. I can't really type anything either so it wont take commands that > I > know. What did I do? How can I fix it? > Help! -- Shawn Heisey Cisco Systems USA TAC Technical Lead for SLC-AAA-LD team Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54682&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Config-register???? [7:54632]
Hi I hope this would help you. http://www.cisco.com/warp/public/701/59.html#console good luck jagan krishnaraj Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54687&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Config-register???? [7:54632]
Mark, Actually, the 'break disabled' is the default setting. It means that after rommon passes control to the IOS, you can't issue a break to get back to rommon. You can always issue the break before control is passed to IOS, regardless of this setting. If you turn this setting off, you can send a break at any time to get to rommon -- even after the router is up and running. This can be a Very Bad Thing (tm), especially if you leave something connected to the console port all the time. Thanks, Shawn "Mark W. Odette II" wrote: > > Set your terminal app's baud rate to 19200 and see if that doesn't fix > ya. > > Also, according to the nifty Config-Register calculator (from Boson's > website), the Break Key is disabled. So, you'll need to let the router > boot normally, and then, via the console, go into config mode and change > the config register to your desired setting. > > HTH's > Mark > > -Original Message- > From: Frank Lodato [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, October 01, 2002 10:10 AM > To: [EMAIL PROTECTED] > Subject: Config-register [7:54632] > > I broke in to a Cisco 2600 router today, but I didn't have access to my > handy sheet that tells me exactly what config-register setting to type > in. > Instead of 0x2142 I put 0x2124. Now when I hard bott the router it > gives > me'JJJ^^' . > Now, I've never seen this before so I'm very confused as to what to do > next. I can't really type anything either so it wont take commands that > I > know. What did I do? How can I fix it? > Help! -- Shawn Heisey Cisco Systems USA TAC Technical Lead for SLC-AAA-LD team Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54656&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Config-register???? [7:54632]
The bit #8 does not prevent user to use break sequence at boot. It just prevent to use it when IOS is loaded ... When a router is in 0x2102, u can use break sequence at boot to enter ROMMON. When a router is in 0x2002 (break enabled), u can use break sequence when IOS is loaded and take traces when router hangs for example. Your problem is that u change console baud rate by setting the bit #5.Just set your terminal speed to 19200 and it will works ... NB : a good advice : if your terminal displays strange caracters, it's often a baud rate problem ... http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/cis3600/hw_in st/3600hig/3600appc.htm Baud Bit 5 Bit 12 Bit 11 115200111 57600110 38400101 19200100 9600000 4800001 2400011 1200010 Hope it helps. Stephane Litkowski Network Engineer (Paris, FRANCE) CCNA + CCNP ""Mark W. Odette II"" a icrit dans le message de news: [EMAIL PROTECTED] > Set your terminal app's baud rate to 19200 and see if that doesn't fix > ya. > > Also, according to the nifty Config-Register calculator (from Boson's > website), the Break Key is disabled. So, you'll need to let the router > boot normally, and then, via the console, go into config mode and change > the config register to your desired setting. > > HTH's > Mark > > -Original Message- > From: Frank Lodato [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, October 01, 2002 10:10 AM > To: [EMAIL PROTECTED] > Subject: Config-register [7:54632] > > I broke in to a Cisco 2600 router today, but I didn't have access to my > handy sheet that tells me exactly what config-register setting to type > in. > Instead of 0x2142 I put 0x2124. Now when I hard bott the router it > gives > me'JJJ^^' . > Now, I've never seen this before so I'm very confused as to what to do > next. I can't really type anything either so it wont take commands that > I > know. What did I do? How can I fix it? > Help! Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54652&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Config-register???? [7:54632]
Set your terminal app's baud rate to 19200 and see if that doesn't fix ya. Also, according to the nifty Config-Register calculator (from Boson's website), the Break Key is disabled. So, you'll need to let the router boot normally, and then, via the console, go into config mode and change the config register to your desired setting. HTH's Mark -Original Message- From: Frank Lodato [mailto:[EMAIL PROTECTED]] Sent: Tuesday, October 01, 2002 10:10 AM To: [EMAIL PROTECTED] Subject: Config-register [7:54632] I broke in to a Cisco 2600 router today, but I didn't have access to my handy sheet that tells me exactly what config-register setting to type in. Instead of 0x2142 I put 0x2124. Now when I hard bott the router it gives me'JJJ^^' . Now, I've never seen this before so I'm very confused as to what to do next. I can't really type anything either so it wont take commands that I know. What did I do? How can I fix it? Help! Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54638&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Config-register???? [7:54632]
You've managed to set the router to netboot, and the console baud rate to 19200. Everything else is the same as the default 0x2102. Set your baud rate to 19200, and after make sure there is no baud rate in line con 0, get the config-register set right, and you can switch back to 9600 baud. Useful tool in case something like this happens again: http://www.marcuscom.com/confregdecode.html Thanks, Shawn Frank Lodato wrote: > > I broke in to a Cisco 2600 router today, but I didn't have access to my > handy sheet that tells me exactly what config-register setting to type in. > Instead of 0x2142 I put 0x2124. Now when I hard bott the router it gives > me'JJJ^^' . > Now, I've never seen this before so I'm very confused as to what to do > next. I can't really type anything either so it wont take commands that I > know. What did I do? How can I fix it? > Help! -- Shawn Heisey Cisco Systems USA TAC Technical Lead for SLC-AAA-LD team Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54641&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Config-register???? [7:54632]
NO, here are my symptoms, Now, I can't: -type commands after the "J's" finish appearing -CTRL break does stop the J's, but nothing on the keyboard works properly so I can't type in any commands -hard boot gives the same results everytime.(J's) and that's it -I haven't let the router sit for a while after hard booting it to see if maybe I was a little impatient by trying to type things in before it was done. -I wont be able to work on the router again until Friday Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54640&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Config-register???? [7:54632]
Can you power cycle the router and hit your break sequence to get to ROMMON and from there change the register with the confreg 0x2102 command?? Dave Frank Lodato wrote: > > I broke in to a Cisco 2600 router today, but I didn't have access to my > handy sheet that tells me exactly what config-register setting to type in. > Instead of 0x2142 I put 0x2124. Now when I hard bott the router it gives > me'JJJ^^' . > Now, I've never seen this before so I'm very confused as to what to do > next. I can't really type anything either so it wont take commands that I > know. What did I do? How can I fix it? > Help! -- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367 "You don't make the poor richer by making the rich poorer." --Winston Churchill Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54637&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Config-register???? [7:54632]
I broke in to a Cisco 2600 router today, but I didn't have access to my handy sheet that tells me exactly what config-register setting to type in. Instead of 0x2142 I put 0x2124. Now when I hard bott the router it gives me'JJJ^^' . Now, I've never seen this before so I'm very confused as to what to do next. I can't really type anything either so it wont take commands that I know. What did I do? How can I fix it? Help! Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54632&t=54632 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
