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DUA1860-0AAA01
Bridge Filters 1-29
Enabling Custom Filtering
You have to enable custom filtering before it becomes effective.
You can enable and disable all custom filters or individual custom
filters with ease.
As custom filtering can involve multiple checking of packets, it
can have an adverse impact on bridge performance in a high
traffic rate environment. Therefore, it is best to plan custom
filtering carefully, enabling filters only as necessary.
The 4 Port Ethernet Bridge Module performs filtering tests in a
specific order:
1
Multicast-to-Port filtering
2
Port-to-Port filtering
3
Host-to-Port filtering
4
Host-to-Host filtering
5
Protocol filtering
6
Bit filtering
In mathematical terms, the filtering operation is characteristic of a
logical OR. If the filter sets of any one type indicate that a packet
should be filtered out, the bridge will discard it and perform no
further tests. You can improve bridge performance by using
higher precedence filters when possible.
For example, you may set up port-to-port filter sets to filter out
packets between ports 1 and 2. You may then create a
host-to-host filter set that includes a device connected to port 1
and a device connected to port 2. These devices will not be able
to communicate because their packets will be filtered out by
port-to-port filtering.