I have 10Mbps WAN link speed and with no qos and very light traffic, both FTP and TFTP image upgrade are very slow. I am getting speeds of only 55Kbytes/sec and 50Kbytes/sec respectively. I thought FTP will be much faster (even with 12 bytes per packet more overahead) than TFTP, because of no small 512KB packets used by TFTP and ack requirements for each packet transmitted, but speed seems almost same in both cases.
I am using tftpd32 (recommended by Cisco in so many docs) for TFTP server and FTPDMIN and FreeFTPd and results are similar. Is it limitation of Cisco routers / switches that you can not have faster than 50 to 55Kbytes ( less than 500kbps) for IOS upgrades?
Much appreciate Dave for your detailed response. I was just curious and also worried that I will have to first delete image from flash (not enough room to accomodate two images) and then leave router running while upgrading over DMVPN and for a 36MB image that could take over 15 minutes at these slow speeds. If the vpn tunnels breaks because of internet circuit issues, I can restart copy process, but if meanwhile there is power outage situation (though we believe backup should last for 10 minutes at remote sites) for few minutes, then router can not boot up. So I was hoping that probably ftp will be faster. But you indicated that limitation is the image being written to flash.
Anyway, we can copy image directly to ram (and that will be faster and from there to local flash) atleast to take care of WAN outage?
Configure DHCP WAN Settings on the RV34x Router
A Wide Area Network (WAN) is a network that covers a broad area. A user or network of users can connect to the Internet through an Internet Service Provider (ISP) who offer...
Configure Static IP WAN Settings on the RV34x Router
A Wide Area Network (WAN) is a network that covers a broad area. A user or network of users can connect to the Internet through an Internet Service Provider (ISP) who ...