This is a URI string that specifies the location and various parameters to be used by the switch to perform a get or put operation using any of the supported protocols TFTP, FTP, sFTP, SFTP and FTP are mandatory and TFTP is recommended to support various user update tools. The IOM must report the protocols supported for the level of executing firmware in the IOM capabilities field of the VPD EEPROM. In this context the CMM (or remote host) acts as the server and the IOM acts as the client. The format of this string is as follows: <protocol>://<username>:<password>@<IP address or hostname>:<port>/<path>/<filename> An example of a fully qualified address for the firmware packet file would be: ftp://USERID:PASSW0RD@192.168.0.2:30045/tmp/service.log or ftp://USERID:PASSW0RD@[fe80::290:27ff:fe29:6019]:30045/tmp/service.log or sftp://USERID:PASSW0RD@192.168.0.2:30045/tmp/service.log or sftp://USERID:PASSW0RD@[fe80::290:27ff:fe29:6019]:30045/tmp/service.log where the FTP or sFTP protocol will be used for transferring the packet file, username is USERID, password is PASSW0RD, host IP address is fe80::290:27ff:fe29:6019 or 192.168.0.2, port number is 30045, and /tmp is the full pathname to the packet file service.log. Note: The URI may or may not have a port number. If the port number is not included the default port number for that protocol will be used. Some protocols do not need the username, password, and the port number, so the minimum requirement for a fully qualified address would be: <protocol>://<IP address or hostname>/<path</<filename> An example of a fully qualified address for the firmware packet file can be: tftp://192.168.0.2:2022/1527 tmp/service.log Note: CMM sets the systemFileCmdUri to provide the URI that includes the IP address, protocol, filename.filetype and any authentication parameters. a. If the IOM currently has a file contained in the IOM's file-system then the URI will contain the appropriate filename.filetype b. If the IOM does not generate the file until the file transfer, the CMM will create the URI with a prefix filename.filetype such as IOM3_service_.txt. The IOM is then responsible to parse the file name for a the category of file being requested by the CMM (_'service_' or '_config_' or '_syslog_'). Then concatenate to the MM's created prefix the IOM's VPD part-number and a timestamp. For example the IOM would use the prefix created by CMM 'IOM3_service_.txt' to 'IOM3_service_02R1014_20110916-004651.tgz'. (generic format is; <IOM(slot number)>_service_<IOM Part Number>_<date: 4 digit year 2 digit month 2 digit day>-<time: 2 digit hour 2 digit minutes 2 digit seconds> Note: file-type used is completely up to the IOM. Notes on sftp file transfers: (1) Summary: CMM will provide to the IOM the fingerprint of the CMM sftp server's public key as part of the other parameters in the URI for the file transfer. (2) CMM 'sets' to the IOM the URI which will contain the fingerprint (128bit MD5 fingerprint). For example assume the 128bit MD5 fingerprint of the 1024-bit RSA key is '00:6d:75:9e:f3:38:2b:6b:2e:e7:a8:87:9f:ea:26:03'. CMM issues a 'set' of the URI to the IOM of form: <protocol>://<username>:<password>;<fingerprint>@<IP address>:<port>/<path>/<filename. Then the URI would be: sftp://USERID:PASSW0RD; 00:6d:75:9e:f3:38:2b:6b:2e:e7:a8:87:9f:ea:26:03@ [fe80::290:27ff:fe29:6019]:30045/tmp/application.img (3) The fingerprint character string then will be used by IOM to create the CMM's sftp servers public key and add to the IOM's known host key file. (4) IOM sftp client then connects to the CMM sftp server. Since IOM has the CMM sftp servers public key fingerprint the IOM sftp client will look into it's known host key file. IOM begins the sftp transfer of application.img using the user credentials (for example USERID, PASSW0RD) and CMM's sftp server key. Note - As of 5/1/2013 this specification assumes that the fingerprint in the URI will be for a RSA key only. Therefore all IOM sftp client's when connecting to the sftp server will respond to the sftp server and indicate in the 'server_host_key_algorithms' list that a RSA key is the preferred key by listing this first in the 'server_host_key_algorithms' parameter name-list. ' The sftp client and server then will be required to use a RSA key for the file transfer. In the future the URI syntax will be changed to allow the user to specify which type of key (RSA or DSA) the fingerprint is for.