Many Thanks for reply,
Just to inform I did the below process step by step.
1 - Assign IP to existing / create vlan to access TFTP server (any machine one the LAN)
conf t
inter vl 1
ip add 192.168.100.1 255.255.255.0
no sh
end
1 - Prepare any port for that VLAN
int gi 1/0/1
swi
swi mo access
swi access vl 1
exit
3 - ensure the connectivity (both ways)
ping 192.168.100.100 (IP for TFTP server)
4 - Assuming IOS is downloaded on server and TFTP is done, on SW:
copy tftp: flash:
192.168.100.100 (IP for TFTP server)
cat3k_caa-universalk9.16.03.06.SPA_2 (Exact IOS name, in some cases in the end you might need to add ".bin"
Note: this might take several minutes depending on IOS Size.My case took more than 10 mins.
5 - in case if your switch is having two IOSes you need to mention from which IOS it will boot, so perform the below step for 3850.
config t
boot system flash:cat3k_caa-universalk9.16.03.06.SPA_2 (flash:exact_ios_name)
exit
6 - just to confirm on next boot what IOS it will take.
show boot system
7- Save and reload.
wr mem
reload
Many thanks and good luck...
Regards,,,
