3Com 4007 Implementation Manual page 339

3com 4007: install guide

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For example, port 1 has a packet filter using the DPGM assigned to port

1's rxAll path and a broadcast frame is received on port 1. The bridge

determines that the frame will be flooded to the VLAN ports 2-5. The

filter is processed 4 times:

1 Once for the RX port 1 - TX port 2 pair

2 Once for the RX port 1 - TX port 3 pair

3 Once for the RX port 1 - TX port 4 pair

4 Once for the RX port 1 - TX port 5 pair

Use the Standard Port Group filter to contain broadcast, multicast, and

flooded frames:

If ports 1-3 are in port group 1, 4-5 are in port group 2, and the rxAll path

filter is applied to 1-5, then the appropriate filtering restricts the flooding

to the corresponding port group.

Table 68 and Table 69 show how each port pair filters or does not filter a

broadcast frame that is received on port 1 and destined for ports 2,3,4,5:

Table 68 Port Group Mask Table

Table 69 Filter Processing for Frame Flooded from Port 1 to Ports 2-5

The result is that the frame is flooded to ports 2,3, and the frame is

filtered from ports 4,5.

Using Port Groups in Custom Packet Filters

0x00000001 - ACCEPTED.

0x00000000 - FILTERED.

4007r - switch