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Unfortunately there is no way to upgrade or upload your Switch image (IOS) without causing any downtime on your network. But it take max5 mins or less to upload or upgrade your image on the switch.
All you need to do is get yourself a Laptop or PC whatever you have easily avaiable with you and connect it with your switch (on any port). Lets say you have conencted on fa0/24
So first create a VLAN and assign an ip address on that vlan of your switch and assign the switch port fa0/24 that vlan.
Switch>en
Switch#configure
Configuring from terminal, memory, or network [terminal]?
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#
Switch(config)#vlan100
Switch(config-vlan)#name TFTP
Switch(config-vlan)#exit
Switch(config)#int vlan100
%LINK-5-CHANGED: Interface Vlan100, changed state to up
Switch(config-if)#ip address192.168.0.1255.255.255.0
Switch(config-if)#no shutdown
Switch(config)#int fa0/24
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan100
%LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan100, changed state to up
Switch(config-if)#exit
Now assign an IP address on your PC or laptop whatever you from the same subnet you have jjst assigned on your switch's Vlan100 i.e 192.168.0.1 so lets say we assign an Ip address of192.168.0.2 with an subnet mask of 255.255.255.0 with a default gateway pointing towards the switch i.e.192.168.0.1
And now ping from your switch to your PC or vice versa
Switch#ping192.168.0.2
Type escape sequence to abort.
Sending5,100-byte ICMP Echos to192.168.0.2, timeout is2 seconds:
.!!!!
Success rate is80 percent (4/5), round-trip min/avg/max =0/0/0 ms
Switch#ping192.168.0.2
Type escape sequence to abort.
Sending5,100-byte ICMP Echos to192.168.0.2, timeout is2 seconds:
!!!!!
Success rate is100 percent (5/5), round-trip min/avg/max =0/0/1 ms
We have full connectivity between Switch and PC and now install a software called TFTPD32 this is used to make you PC work as a TFTP server. You can find that software from this link http://tftpd32.jounin.net/
Open the TFTP32 software and trun it on and also browse to the folder from the TFTPD32 software where you have your IOS for the switch on your PC. Lets assume that IOS name is Wat$up.bin on your PC.
Go to the switch and copy the current working IOS on the switch as a precaution.First find out the name of the current IOS on your switch by using the following command,
Switch#show flash
Directory of flash:/
1 -rw- 4414921 <no date> c2960-lanbase-mz.122-25.FX.bin
2 -rw- 616 <no date> vlan.dat
bytes total ( bytes free)
Now copy the c2960-lanbase-mz.122-25.FX.bin name and paste it the follwoing command Here this name c2960-lanbase-mz.122-25.FX.bin will depend on your current switch.
Switch#copy flash: tftp:
Source filename []? c2960-lanbase-mz.122-25.FX.bin
Address or name of remote host []?192.168.0.2
!(here IP address of the PC on which your running TFTP32)
Destination filename [c2960-lanbase-mz.122-25.FX.bin]?
Writing c2960-lanbase-mz.122-25.FX.bin...!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK -4414921 bytes]
4414921 bytes copied in0.102 secs ( bytes/sec)
Now copy your new IOS from the PC to Switch and also delete the current IOS running on the switch
Switch#show flash
Directory of flash:/
1 -rw- 4414921 <no date> c2960-lanbase-mz.122-25.FX.bin
2 -rw- 616 <no date> vlan.dat
bytes total ( bytes free)
Switch#delete flash:
Delete filename []?c2960-lanbase-mz.122-25.FX.bin
Delete flash:/c2960-lanbase-mz.122-25.FX.bin? [confirm]
Switch#show flash
Directory of flash:/
2 -rw- 616 <no date> vlan.dat
bytes total ( bytes free)
Now Copy the IOS from the PC
Switch#copy tftp: flash
Address or name of remote host []?192.168.0.2
Source filename []? Wat$up.bin
Destination filename [Wat$up.bin]?
Accessing tftp://192.168.0.2/Wat$up.bin...
Loading Wat$up.bin from192.168.0.2: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK -4414921 bytes]
4414921 bytes copied in0.091 secs (1318172 bytes/sec)
Switch#show flash
Directory of flash:/
3 -rw- 4414921 <no date> Wat$up.bin
2 -rw- 616 <no date> vlan.dat
bytes total ( bytes free)
At the moment your network wouldn't experience any downtime but as for the new IOS to take effect you would need to reload your switch and then you would experience downtime
Switch#reload
Proceed with reload? [confirm]
I hope that resolves your problem.
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