What Is A Port Group - 3Com LANPLEX 2500 Operation Manual

Figure 7-6 Adding an Address to an Address Group
If the address was never learned or has been aged, the port ID associated
with the address is set to "unknown."
Broadcast and other multicast addresses are assumed to be in all groups.
Because the address table can hold up to 8K address entries, the total
number of addresses that can be configured into address groups is at
most 8K.
What Is a Port Port groups are conceptually similar to address groups. A port group is a list
Group? of ports. Because the LANplex 2500 system has only 2 bridge ports (16
Ethernet ports and 2 FDDI), a group can have no more than 18 ports. You
can configure up to 32 port groups per LANplex 2500 system.
When a port is added to a group, the port is inserted into a port table on
the associated system. Each port table entry contains a 32-bit group mask.
As with address group masks, each bit in the mask specifies one of the 32
Using Address Groups and Port Groups in a Packet Filter
Address Table
Address
00803e003900
00803e000d20
00803e001520
00803e003d00
00803e342000
00803e003420
00803e3915d0
00308e000017
00308e3d0042
Address
00803e003d20
added...
32 bits
0 0 1 1 0 0 0 0 0 1
3029 23
Port Group Mask
Ethernet port 1 00000000
Ethernet port 3 00020048
Ethernet port 4 0f400000
unknown 00930d00
unknown 00020048
Ethernet port 7 42024000
Ethernet port 6 ffffffff
FDDI port 1 00000000
unknown 00000346
Ethernet port 8 30410020
0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0
17
7-9
Address assigned to
no address groups
Address assigned to
all address groups
...and assigned to address
groups 6, 17, 23, 29, and 30
1 0 0 0 0 0
6