HP 10:10 LAN Bridge MB, Installation And Reference Manual

Page: 33 / 122

W
I
ldcard Filters
Enter
WI
at the Config prompt to display the current bridge wildcard filters and to receive a
prompt allowing you to change (or create) or delete the wildcard filters. You can set a total of
two wildcard filters. Enter
HE
at the Wildcard Filter prompt to get help on completing this
task. A more detailed explanation and examples are provided below.
For some additional information about the wildcard filters including an illustration, see chapter
6, “How the Bridge Works”.
Default Configuration: no wildcard filters are specified.
Explanation
The wildcard filter is specified as 32 bits, followed by a space, followed by the byte offset (the
distance in bytes from the beginning of the packet to the start of the section where the wildcard
filter is to be applied). Use the format:
bbbb-bbbb-bbbb-bbbb-bbbb-bbbb-bbbb-bbbb NNNN
For each bit position (
b
), enter either 1, 0, or X. You must enter one of these characters for all
32 bits in the filter, and at least one of the characters must not be X.
Enter the byte offset (
NNNN
) as a one to four-digit decimal value. This value specifies the
location in the received packet at which the wildcard’s bit pattern of 1s, 0s, and Xs is to be
applied. The offset value may range from 0 to 1514 bytes.
The received packet is discarded if the 1s and 0s in the specified 32-bit section of the packet
match the 1s and 0s in the wildcard filter. An X in any bit position in the wildcard filter will
match either 1 or 0 in the corresponding packet bit position.
Examples
The examples on the next page assume that a 48-bit (6-byte) scheme is being used for the
address fields in the IEEE 802.3 or Ethernet packets.
Configuration 3-9