Bay Networks NauticaRS Reference Manual page 403

Bridging and Frame Filters
Masks are entered in hexadecimal notation. As shown in
the example, the portion of this byte that we want to
match is in position 8. The hexadecimal value for this
mask is 80.
In the next example, we want to match the values in
positions 8 and 1 in the first half of the byte and
positions 4 and 2 in the second half:
The mask entered here (in hexadecimal) is 96. 8+1 in the
first half is 9, and 4+2 is 6.
Parameter: value
MTC: va
Default: (Blank)
Options: A value to match in hexadecimal notation
Function: When matching parts of a packet, you must enter exactly
what you are matching against. Used in conjunction with
the mask parameter, the value parameter allows you to
match against a specific value at a specific mask
location.
Instructions: In the following example, we have entered a mask of 80,
specifying that we want to match a value in position 8 of
the first half of a byte:
The value that we want to match here is 0. The value
entered in the value parameter then is 00. This specifies
that we want to match a zero against the first position of
the byte as specified in the mask parameter.
117237-E Rev.00 12-7