Thinklogical VX Routers Manual - Manual (Page 58)

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VX Router Manual Rev. O September, 2014 Page 57
output can connect to an input with a priority greater than, or equal to, its priority. Thus, a priority level of 1 on
an output can connect to any input (priority 1, 2,
3…).
The user must provide a table defining the priorities for each input and output of the switch matrix. This table is
in the form of a comma separated value (csv) file. This file contains the values in three columns: Port
Direction (i=input, o=output), Port Number and Port Priority. For example:
I/O Number Priority
"i", 1, 1
"i", 2, 2
"i", 3, 3
"i", 4, 1
"i", 5, 3
"o", 1, 1
"o", 2, 3
"o", 3, 2
"o", 4, 4
"o", 5, 1
Output 1 can connect to ports 1-5.
Output 2 can connect to ports 3 and 5.
Output 3 can connect to ports 2, 3, and 5.
Output 4 cannot connect to any ports.
Output 5 can connect to ports 1-5.
Note that Port Direction (i or o) is in quotes and that the table must use only the following ASCII printable
characters:
Double quotes (or speech marks), character code = 34 (")
Lower case i character code = 105 (i)
Lower case o character code = 111 (o)
Comma character code = 44 (,)
Carriage Return character code = 13 (CR)
Line Feed character code = 10 (LF)
The VX Router will interpret the Restricted Switching Table (csv file) during the boot-up. Any errors that occur
during the Restricted Switching Table interpretation process will be logged in the messages file at the following
location: var/log/messages
It is recommended that the Messages File be reviewed and any errors in the Restricted Switching Table be
corrected before implementing multiple levels of security classification domains on the same VX Router. It is
also recommended that Restricted Switching be fully tested before implementing multiple levels of security
classification domains on the same VX Router.
The Restricted Switching Table files for the VX Routers are stored on the Controller Card at the following
location:
var/local/router/restrict/upstream.csv
var/local/router/restrict/downstream.csv
Restricted switching is disabled when Restricted Switching Table files are removed. By default, when there are
no Restricted Switching Table files, all input and output ports will have a priority of 1. All VX Routers are
shipped without Restricted Switching Table files stored on the Controller card and therefore do not restrict any
connection.