Cisco 3850 switch- Unable to upload IOS from tftp server

[radhakrishnan.mathiyalagan]

I am trying to upgrade IOS in Cisco 3850 switch from the tftp server.

Currently running IOS Version: (cat3k_caa_universalk9-m) version 03.06.06E

Trying to upgrade to : cat3k_universalk9.16.09.05.spa.bin

When I am trying to copy the iOS from the tftp server using the command " copy tftp: flash: " it started copying but it ends with following error " line time expired "

I am using SSH

Following are the configuration:

Line con 0

exec-timeout 0 0

no exec

line aux 0

transport output none

stopbits 1

Line vty 0 4

access-class 1 in

exec-timeout 0 0

transport input ssh

transport output ssh

line vty 5 15

access-class 1 in

exec-timeout 0 0

transport input ssh

transport output ssh

Please help me with valuable solution

[Seb Rupik]

Hi there,

Use a different protocol like SFTP or SCP for file transfers. If you really are stuck using TFTP then increase the transfer block size:

!
ip tftp blocksize 8192
!

..and re-attempt the tranfer.

cheers,

Seb.

[radhakrishnan.mathiyalagan]

Thanks for your response. I will try and let you know

[radhakrishnan.mathiyalagan]

I have upgraded the tftp server to tftpd64 4.64 and increased the blocksize of tftp to 4096 still not able to upload the IOS

Please help me with any other suggestion.

[marce1000]

 Check the tftp server's logs  just after the update is attempted.You may find additional info.

 M.

[marce1000]

  - Also , if you are stuck with TFTP check the tftp server's logs. You may find additional info.

  M.