Bridge Mac Filter Configuration Screen - Cabletron Systems Netlink FRX4000 User Manual

How Filter Masks Work
Configuring Bridging
Bridge Filter Definitions
* Filter Category
* Filter ID
A Filter Name
B Source MAC Address Value
C Source MAC Address Mask
D Destination MAC Address Value
E Destination MAC Address Mask
Option::
Figure 15-2 Bridge MAC Filter Configuration Screen
Most Bridge filter parameters are assigned values and associated "masks." The mask
determines (by the process described below) whether the filter will be applied to the
packet.
The binary bits of the mask will be "ANDed" (0+0=0, 0+1=0, 1+1=1) to the value, as
in this example:
Assume the value (hex) is
follows:
Value:
Mask:
AND Result:
The mask will also be ANDed to its corresponding field in each Bridged packet as
determined by Bridge Filter
result of the configured value and mask. If the two results match, the filter will be
applied. This process allows a number of packet field values to match the AND result
of the mask and value; for example:
Packet field =
1233
Binary value:
0001001000110011
Mask:
1111000000000000
AND Result:
0001000000000000
5–MAC
1
filter_abc
ff00ac00
ffff0000
10ac45000001
ffffff000000
and the mask is
1234
0001001000110100
1111000000000000
0001000000000000
Applications. This result will be compared to the AND
, Mask = : Packet field =
F000
Value:
Mask:
AND Result:
Node Name=node_xyz
from Main Menu
[A],[A],[E],[F],[G]
. The binary "ANDing" is as
F000
, Mask =
1237
0001001000110111
1111000000000000
0001000000000000
:
F000
15-7