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Chapter 3 — AsantéBridge 1012 Local Management
When a device on either segment transmits, its packets are read
by the bridge. The bridge reads the
source address contained in
the packets and writes that address into the table as a dynamic
entry with a tag associating it with the segment it was received
on. Thereafter, when the bridge receives a packet on either seg-
ment, it will compare the
destination address of that packet to
the table entry.
If there is a match, the packet is forwarded to the appropriate seg-
ment. If there is no match, the packet is forwarded to
the oppo-
site segment from which it is received
.
Static table entries are treated differently. These are manually
entered and are only deleted from the table under circumstances
defined at the time the addresses are entered. There are also differ-
ences in the way the bridge treats these entries.
When the bridge receives a packet from either segment, it reads
the
destination address of the packet and checks the forwarding
table for static entries. If a match is found, the packet is forwarded
according to the instructions associated with the matching table
entry.
If a match is not found in the static entries, the table is checked
again to see if there is a dynamic entry for this address.
If there is already a dynamic entry the bridge then checks for a
dynamic entry matching the
destination address of the packet
and forwards it accordingly.
If there is no existing dynamic entry, the bridge writes the source
address into the table as a dynamic address as described above.
In summary:
❏ A dynamic entry is derived from the source address of
an incoming packet and is used to direct forwarding of
packets carrying this address as their
destination
address.
❏ A static entry is manually entered and is used to direct
forwarding of packets carrying this address as their
des-
tination.