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User Guide
138
required. This selection mode defines an offset and a mask. Frames matching the
specified mask in the configured offset are selected.
Table 6.7: Generic Selection
Field Description
Filter match Enables fixed offset selection in the current filter. The value
configured here is used to determine which frames are
allowed to pass through the filter and which ones are
blocked. The available configuration values for this field are:
• Ignore: Generic matching is ignored and not taken into
account for the purpose of the filter. All frames are allowed
to pass through the filter when Ignore is configured if they
are not blocked by other selection criteria.
• Equal to: All frames matching a user configurable pattern
are allowed to pass through the filter. The matching pattern
is configured with the help of the Payload selection, Offset
(bytes), Match code and Mask fields.
Payload selection Defines the payload type and the reference point within the
frame to start counting the filter offset. The reference can be
the beginning of the MAC, IPv4, IPv6 or UDP payload
depending on the chosen value. It is also possible to set the
reference to the beginning of the Ethernet frame (first byte
immediately after the SDF) by configuring Whole frame in
this field.
The Payload selection field is shared by all the port A or port
B filters. If the Frame start field is modified for one specific fil-
ter, the remaining filters of the same port will be automatically
configured to the same value.
Offset (bytes) This field defines the offset expressed in bytes from the refer-
ence point defined with the Payload selection control. The
value 0 corresponds with the first byte of the MAC, IPv4 or
UDP payload (or the first frame byte, if Payload selection is
set to Whole frame).
If due to the limited frame size, some or all the byte positions
defined by the Offset (bytes) field, do not exist in the corre-
sponding payload, the equipment will consider that the frame
does not match the filtering criteria.
The offset field is shared by all the port A or port B filters. If
the Offset (bytes) field is modified for one specific filter, the
remaining filters of the same port will be set to the same
value.
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