question about 7200 booting up time when using different ios ?

[Dr.X]

hi ,

i have a 7200 router npeg2 processor .

when i bought the router , there were a defualt ios which is named as

======>>  c7200p-ipbase-mz.124-4.XD.bin    , note that this ios  is old and dont support BGP,

note that using this ios when reloading my router it takes about 2 minutes only or less .

but if i used another ios which is loaded to disk2 memory such that

c7200p-advipservicesk9-mz.124-24.T4.bin

when reloading the router , it takes about 2 minutes and 40 seconds

when using another ios i type the command  as below :

boot system disk2:c7200p-advipservicesk9-mz.124-24.T4.bin

my question is ,

how to enhance the router booting up  time???

can i reduce this time to some thing lesser than 2 minutes ????

and why using the other ios it takes more time ??? is this natural event ??

here is output of disk2

Router2#sh disk2:

-#- --length-- -----date/time------ path

1     13482144 Apr 27 2011 04:37:52 c7200p-ipbase-mz.124-4.XD.bin

2     37962496 Mar 07 2001 07:08:16 c7200p-advipservicesk9-mz.124-24.T4.bin

3     39814568 Mar 07 2001 07:37:08 c7200p-adventerprisek9-mz.124-24.T4.bin

regards

Ahmad

[Reza Sharifi]

Hi Ahmad,

Every IOS is different. Some take longer than others.  It also depends on the feature set you are using.  There is not much really you can do to make it boot faster.  I have seen the same thing with 3750 series running IOS 15.  It also takes a long time to boot specially the first time. 

HTH

[Dr.X]

hi ,thanks for ur reply

but im facing a strange problem which is alot of  config commands was hidden ,

i mean before reload router many times every thing is ok ,

but now on the same ios , alot of config were hidden !!!!!!!!!! and i manully adding them

does using serveral ios and reloading router many times may lose config in startup ???

im stange and wondering if reloading router  with  changin ios may affect router

regards

[Reza Sharifi]

Ahmad,

Reloading and loading different IOS images does not effect the config.  If you see some of the config that you originally had on your router and doesn't show up is because those command are not needed in the new IOS or the way you implemented them is different from the old IOS.

Also, reloading IOS is not something you would need to do often, as most features can be enabled without reloading the IOS.

HTH

[AhmedSonba]

Hello Ahmed,

There is actually way to speed up your IOS boot time which is called warm reboot,

please check out the following link I am sure you will find it interesting

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t2/feature/guide/gtwrmrbt.html

Hope it will Help

Ahmed Sonba

[Reza Sharifi]

Hi Ahmad-S

That is only in case of software crashes:

From the link you provided:

Software Support Only

A warm reboot should be used only for forced software crashes. Hardware failure of any kind will result in a cold reboot.

When you switching from one IOS to another, you need cold boot.

HTH

[AhmedSonba]

Hi Reza,

I totally Agree there is no doubt about it  if you want to load to a new IOS than you certainly need to make the normal  cold boot.

Ahmed Sonba

[Dr.X]

hi ,

i remembwered the reason of my problem ,

when using ios of ipbase which  reject alot of config , it seemed i made write====>copy   run to start ,and in this case the rejected configs werent added to stratup config  whe nusing the newer iso .

so we migh take care when using may ios and and saving  configs.

regards

Ahmad