
User’s Manual of LRP-822CS/LRP-1622CS
344
ERATION
The Switch is implemented with an address table. This address table is composed of many entries. Each entry is used to store
the address information of some nodes on the network, including MAC address, port no, etc. This information comes from the
learning process of Ethernet Switch.
5.2 Learning
When one packet comes in from any port, the Switch will record the source address, port number and the other related
formation will be used to decide either forwarding or filtering for future packets.
5.3 Fo
ding & Filteri
om some po
so check the destination address besides the source
ddress learning. The Ethernet Switching will look up the address table for the destination address. If not found, this packet will
d to all the other ports except the port, which this packet comes in. And these ports will transmit this packet to the
network it co
tination address is located at a different port from this packet comes in, the Ethernet
witching will forward this packet to the port where this destination address is located according to the information from the
address table. But, if the destination address is located at the same port with this packet, then this packet will be filtered, thereby
increasing the network throughput and availability
5.4 Store-and-Forward
Store-and-Forward is one type of packet-forwarding techniques. A Store-and-Forward Ethernet Switching stores the incoming
frame in an internal buffer and does the complete error checking before transmission. Therefore, no error packets occur. It is the
best choice when a network needs efficiency and stability.
The Ethernet Switch scans the destination address from the packet-header, searches the routing table provided for the
incoming port and forwards the packet, only if required. The fast forwarding makes the switch attractive for connecting servers
directly to the network, thereby increasing throughput and availability. However, the switch is most commonly used to segment
existence hubs, which nearly alwa
g can be easily configured in any
Ethernet network environment to significantly boost bandwidth using the conventional cabling and adapters.
Due to the learning function of the Ethernet switching, the source address and corresponding port number of each incoming
and outg
ket is stored in a routi
nformation is subsequently used to filter packets whose destination
ent as the
twork traffic to its respective domain and reduces the
and forwar
ets occur. More reliably, it reduces the re-transmission rate.
No packet loss will occur.
5. SWITCH OP
5.1 Address Table
information in the address table. This in
rwar
ng
When one packet comes fr
rt of the Ethernet Switching, it will al
a
be forwarde
nnected. If found, and the des
S
ys improves the overall performance. An Ethernet Switchin
oing pac
ng table. This i
address is on the same segm
source address. This confines ne
overall load on the network.
The Switch performs "Store
d"; therefore, no error pack
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