3Com LANPLEX 2500, Руководство по эксплуатации

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Using Address Groups and Port Groups in a Packet Filter 7-9
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
Group?
Port groups are conceptually similar to address groups. A port group is a list
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
Address Table
00803e003900
00803e000d20
00803e001520
00803e003d00
00803e342000
00803e003420
00803e3915d0
00308e000017
00308e3d0042
00803e003d20
Address Port
Ethernet port 1
Ethernet port 3
Ethernet port 4
unknown
unknown
Ethernet port 7
Ethernet port 6
FDDI port 1
unknown
Ethernet port 8
Group Mask
32 bits
00000000
00020048
0f400000
00930d00
00020048
42024000
ffffffff
00000000
00000346
30410020
3029 23 17 6
Address
added...
Address assigned to
no address groups
...and assigned to address
groups 6, 17, 23, 29, and 30
1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Address assigned to
all address groups