88
Other commands in BootROM mode
1. DIR
command
Used to list existing files in the FLASH.
[Boot]: dir
boot.rom 327,440 1900-01-01 00: 00: 00 --SH
boot.conf 83 1900-01-01 00: 00: 00 --SH
nos.img 2,431,631 1980-01-01 00: 21: 34 ----
startup-config 2,922 1980-01-01 00: 09: 14 ----
temp.image 2,431,631 1980-01-01 00: 00: 32 ----
2. CONFIG RUN command
Used to set the IMAGE file to run upon system start-up, and the configuration file to run
upon configuration recovery.
[Boot]: config run
Boot File: [nos.img] nos1.image
Config File: [boot.conf]
2.5.3 FTP/TFTP Upgrade
2.5.3.1 Introduction To FTP/TFTP
FTP(File Transfer Protocol)/TFTP(Trivial File Transfer Protocol) are both file transfer
protocols that belonging to fourth layer(application layer) of the TCP/IP protocol stack,
used for transferring files between hosts, hosts and switches. Both of them transfer files
in a client-server model. Their differences are listed below.
FTP builds upon TCP to provide reliable connection-oriented data stream transfer
service. However, it does not provide file access authorization and uses simple
authentication mechanism(transfers username and password in plain text for
authentication). When using FTP to transfer files, two connections need to be established
between the client and the server: a management connection and a data connection. A
transfer request should be sent by the FTP client to establish management connection on
port 21 in the server, and negotiate a data connection through the management
connection.
There are two types of data connections: active connection and passive connection.
In active connection, the client transmits its address and port number for data
transmission to the sever, the management connection maintains until data transfer is
complete. Then, using the address and port number provided by the client, the server
establishes data connection on port 20 (if not engaged) to transfer data; if port 20 is
engaged, the server automatically generates some other port number to establish data
