3Com 3032 Configuration Manual page 296

292 C 19: C
HAPTER ONFIGURING
B
RIDGE
Figure 104 Final bridging address table
00e0.fcaa.aaaa
Workstation A
Bridging table
MAC address
00e0.fcaa.aaaa
00e0.fcbb.bbbb
00e0.fccc.cccc
00e0.fccc.cccc
00e0.fcdd.dddd
Workstation C
Forward and Filter
The bridge will make the decision to forward frames or not (that is, to filter
frames) depending on the following three conditions:
If Workstation A sends an Ethernet frame whose destination is Workstation C,
the bridge will detect this frame and learn that Workstation C corresponds to
Bridge port 2 by looking up its bridging table. So, it will forward the frame to
Bridge port 2, as shown in the following figure.
Figure 105 Forward
00e0.fcaa.aaaa
Workstation A
Source address Destination address
00e0.fcaa.aaaa 00e0.fccc.cccc
MAC address
00e0.fcaa.aaaa
00e0.fccc.cccc
00e0.fcbb.bbbb
00e0.fccc.cccc
00e0.fcdd.dddd
Workstation C
Destination address Source address
00e0.fccc.cccc 00e0.fcaa.aaaa
Note that the bridge will forward the broadcast or multicast frames received on
one port to the other ports.
Given that Workstation A sends an Ethernet frame to Workstation B, the
bridge will filter this frame rather than forwarding it, since Workstation B and
Workstation A are located on the same physical network segment.
Port
1
1
2
2
Bridge
Bridging table
Port
1
1
2
2
Forwarding
00e0.fcbb.bbbb
Workstation B
Ethernet segment 1
Bridge port 1
00e0.fcdd.dddd
Workstation D
Bridge port 2
Ethernet segment 2
00e0.fcbb.bbbb
Workstation B
Ethernet segment 1
Bridge port 1
00e0.fcdd.dddd
Bridge
Workstation D
Bridge port 2
Ethernet segment 2