Config register 0x2942

[mifi]

Hi,

Anybody knows what is my switch trying to say by "Configuration register = 0x2102 (will be 0x2942 at next reload)"

I googled the meaning of config register 0x2942 but I cannot find any explanation.

Here is the whole CLI output containing the weird message (at the bottom): 

ksw01#show redundancy

Redundant System Information :

------------------------------

       Available system uptime = 24 minutes

Switchovers system experienced = 1

              Standby failures = 0

        Last switchover reason = user_forced

                 Hardware Mode = Duplex

    Configured Redundancy Mode = Stateful Switchover

     Operating Redundancy Mode = Stateful Switchover

              Maintenance Mode = Disabled

                Communications = Up

Current Processor Information :

------------------------------

               Active Location = slot 6

        Current Software state = ACTIVE

       Uptime in current state = 28 minutes

                 Image Version = Cisco IOS Software, IOS-XE Software, Catalyst 4500 L3 Switch  Software (cat4500es8-UNIVERSALK9-M), Version 03.08.04.E RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2017 by Cisco Systems, Inc.

Compiled Thu 06-Apr-17 08:19 by pr

               BOOT = bootflash:packages.conf,1;

        Configuration register = 0x2102

Peer Processor Information :

------------------------------

              Standby Location = slot 5

        Current Software state = STANDBY HOT

      Uptime in current state = 0 minute

                 Image Version = Cisco IOS Software, IOS-XE Software, Catalyst 4500 L3 Switch  Software (cat4500es8-UNIVERSALK9-M), Version  RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2017 by Cisco Systems, Inc.

Compiled Thu 06-Apr-17 08:19 by

        Configuration register = 0x2102 (will be 0x2942 at next reload)

[Meheretab Mengistu · Accepted solution]

Hi Mifi,

https://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/50421-config-register-use.html#anc6

The configuration register can be used to change router behavior in several ways, such as:
- how the router boots (into ROMmon, NetBoot)
- options while booting (ignore configuration, disable boot messages)
- console speed (baud rate for a terminal emulation session)

When the config register is 0x2942:
- Ignores break
- Boots into ROM if initial boot fails
- 4800(?) console baud rate ---> I'm not sure the baud rate.
- Ignores the contents of Non-Volatile RAM (NVRAM) (ignores configuration)

When you switch reboots, it will come up with the above changes. If it is not intentional, you can put it back with the global configuration level 'config-register 0x2102' command.


HTH,
Meheretab

[Leo Laohoo]

The "9" means the console baud rate has been modified from 9600 to 4800.

[mifi]

Thanks!

[Meheretab Mengistu]

You are very welcome!
If we answered your question, please accept it as a solution to help others with similar question.

HTH,
Meheretab