Anybody successfully used firmware upgrade to copy file using TFTP in Cisco 9350-48HX? I keep getting timeout once it started to download the file. TFTP Server and Device connection looks okay. I wonder if anyone experiencing the same issue?
Are you still trying with TFTP? TFTP is a UDP protocol, so make sure your firewall doesn't time out stuff related to UDP, while it starts on port 69, it will switch to a random high port for the transfer. You can potentially help by increasing the blocksize using "ip tftp blocksize 8192".
However, I would recommend switching to SCP if you haven't already, and doing the window-size/bulk-mode recommendations I gave in my previous message.
Device is Cisco C9350-48HX CISCO9K_IOSXE - 17.18.02
Loading xxxxxxxxx/cisco9k_iosxe.17.18.04.SPA.bin from xx.xx.xx.xx (via Vlan2): !... [timed out]
Network connection between server and device is good. It is just failing on this particular model.
What version are you using? The firmware upgrade process within Solarwinds is a bit crazy, we prefer to just run a script against the boxes to transfer the file in ahead of time, then run another script to install/reboot later. Much easier.
On another note, TFTP is a very insecure protocol, and fairly slow. If you don't need security, FTP is much quicker. If you do need security, SFTP is faster, but SCP is even faster compared to TFTP. But, only if you adjust your SSH parameters and TCP parameters. These only affect management traffic but can speed things up by 2-3x!
ip ssh bulk-mode 131072
ip ssh window-size 131072
ip tcp window-size 131072
depending on the IOS version, these commands might need to be altered.
But, we've seen increases in speed from over 10 minutes to transfer an image to less than 3 or 4 minutes.
Don't adjust one parameter without the others though, especially the window sizes!!
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