7/21/2019 How to Upgrade IOS Image on Cisco Catalyst Switch or Router

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How to Upgrade IOS Image on Cisco Catalyst Switch orRouter?

Cisco never stops releasing the new IOS image for its network

switch (or router), so if there is a new version of Cisco IOS, youshould upgrade it.

If you want to upgrade your Cisco IOS image, you need to make surethat you have physical access to the switch and you are in front ofit. Use a console cale to connect to the switch.

How to upgrade ios image on a Cisco catalyst switch? !hereare seven steps helping you do it well. "lease note that the stepsgiven elow will e similar to oth switches and routers.

1. Verify Current IOS Version

#fter you login, go to enale mode, y entering the enalepassword. !his e$ample uses two Cisco catalyst %&' switchescongured in stack mode as shown elow. So, while upgrading youshould upgrade the image on oth the *ash cards.

If you have only one Cisco catalyst switch (non stack mode), followall the steps mentioned in this document, ut you+ll e doing it onlyon one *ash card.

irst, verify the content of the *ash cards, using -dir *ash/0command.

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#s you see aove, oth the *ash cards contains the current IOSimage le, which is version -11.%'.S2'3

4erify what version of IOS image your switch is currently running.5ost likely this will e same as the current IOS image le that yousee in your *ash card. #s you see elow, it is using “12.3(35)SE5″

. !ownload "atest IOS Image from Cisco #e$site

6ownload the latest IOS image for your Cisco wesite7o to cisco.com 89 IOS Software 89 Select your Siwtch (for e$ample/Cisco Catalyst Switch %&'781:!) 89 Click on -6ownload I" ;#S2089 Select the latest version that you want to download (for e$ample/181.''.S2).

<hile you are on this download page, copy=paste the 56' given toyour system. #fter we download the IOS image and move it to theswitch, we+ll verify the 56' checksum efore installing the image.

%. !elete Old IOS Software Image from &lash

Since we+ll e downloading the new ISO image and moving it to the*ash card, we need some space. So, delete the current old imagefrom the *ash card.

7/21/2019 How to Upgrade IOS Image on Cisco Catalyst Switch or Router

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In the aove delete command, =f stands for force, and =r stands for

recurssive.On a side note, you should e using some software to monitor yourswitch status. If you are not doing it install >agios, and monitor yourswitches.

'. Copy the IOS image to Cisco Switch

 !o transfer the IOS image from your laptop to Cisco Switch, youshould run a !!"server on your laptop (or on the system where

you+ve downloaded the IOS image).

If you are running a !!"server on your laptop, and connected tothe switch using a console cale, assign a ip8address to your laptop,and put your laptop on the same network as the switch.

Copy the ISO image to the *ash as shown elow using the “copycommand”. !his will ask you to enter the address of the remotehost (which is your laptop in this case), and the source lename thatneeds to e transferred (which is the ISO image you downloadedfrom cisco wesite).

? copy tftp *ash

9#ddress or name of remote host@ A1.B..

9source lename@ c%&'8ipasekA8mD8118''.S2.in

96estination lename@ c%&'8ipasekA8mD8118''.S2.in

Once you+ve copied it, make sure the le is there on the *ash card.

? dir *ash/

c%&'8ipasekA8mD8118''.S2.in

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 Eust to make sure nothing went wrong during the copy, do a 56'check8sum on this, and compare with the 56' that you noted downfrom cisco wesite while downloading the IOS image. !o create 56'checksum of a le in Cisco catalyst switch, use the -verify0

command as shown elow.

? verify =md' *ash/c%&'8ipasekA8mD8118''.S2.in

If you are running two switches in stack conguration, do the sameon the second *ash card.

? copy tftp *ash1/

? dir *ash1/

? verify =md' *ash1/c%&'8ipasekA8mD8118''.S2.in

(. )odify Switch *oot path+list

>ow it is time to tell switch cisco to use the new ISO image to ootfrom. ;efore changing the oot information, verify the currentconguration, and change it using the -oot system0 command asshown elow.

? show oot

? cong t

? oot system switch all *ash/c%&'8ipasekA8mD8118''.S2.in

,. Sa-e Cong and Restart the Switch

4erify the current oot information, save the current conguration,and reoot the cisco switch as shown elow.

? show oot

? write mem

? reload

/. &inal Verication after IOS Upgrade

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inally verify the current IOS version of the switch, after theupgrade, it should display the new version as shown elow.

? show ver

Switch "orts 5odel S< 4ersion S< Image

888888 88888 88888 8888888888 8888888888

F 1: <S8C%&'781:! 1.1('')S2 C%&'8I";#S2GA85

  1 1: <S8C%&'781:! 1.1('')S2 C%&'8I";#S2GA85

5ake sure to verify your interface and vlan status, to make sureeverything is running properly without any issues.

rom http/==www.thegeekstuH.com=1=B=upgrade8cisco8ios8image= 

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