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5. SWITCH OPERATION
5.1 Address Table
The
Managed Switch
is implemented with an address table. This address table composed of many entries. Each entry is used to
store the address information of some node in network, including MAC address, port no, etc. This in-formation comes from the
learning process of
Managed Switch
.
5.2 Learning
When one packet comes in from any port, the
Managed Switch
will record the source address, port no. And the other related
information in address table. This information will be used to decide either forwarding or filtering for future packets.
5.3 Forwarding & Filtering
When one packet comes from some port of the
Managed Switch
, it will also check the destination address besides the source
address learning. The
Managed Switch
will lookup the address-table for the destination address. If not found, this packet will be
forwarded to all the other ports except the port, which this packet comes in. And these ports will transmit this packet to the network
it connected. If found, and the destination address is located at different port from this packet comes in, the
Managed Switch
will
forward this packet to the port where this destination address is located according to the information from address table. But, if the
destination address is located at the same port with this packet comes in, 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
Managed Switch
stores the incoming
frame in an internal buffer, do the complete error checking before transmission. Therefore, no error packets occurrence, it is the
best choice when a network needs efficiency and stability.
The
Managed Switch
scans the destination address from the packet-header, searches the routing table pro-vided 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. How-ever, the switch is most commonly used to segment
existence hubs, which nearly always improves overall performance. An Ethernet Switching can be easily configured in any
Ethernet network environment to signifi-cantly boost bandwidth using conventional cabling and adapters.
Due to the learning function of the
Managed Switch
, the source address and corresponding port number of each incoming and
outgoing packet are stored in a routing table. This information is subsequently used to filter packets whose destination address is
on the same segment as the source address. This confines network traffic to its respective domain and reduce the overall load on
the network.
Summary of Contents for NS4750-24S-4T-4X
Page 1: ...NS4750 24S 4T 4X User Manual P N 1702826 REV 00 01 ISS 14JUL14 ...
Page 56: ...56 Figure 4 2 7 Privilege Levels Configuration Page Screenshot ...
Page 110: ...110 Figure 4 4 6 Mirror Configuration Page Screenshot ...
Page 117: ...117 Figure 4 5 4 LACP Port Configuration Page Screenshot ...
Page 174: ...174 Figure 4 7 10 MST1 MSTI Port Configuration Page Screenshot ...
Page 180: ...180 Figure 4 8 2 Multicast Flooding ...
Page 249: ...249 Figure 4 9 18 Voice VLAN Configuration Page Screenshot ...
Page 271: ...271 Counter Counts the number of frames that match this ACE ...
Page 281: ...281 Figure 4 11 4 Network Access Server Configuration Page Screenshot ...
Page 315: ...315 ...
Page 328: ...328 ...
Page 335: ...335 ...
Page 346: ...346 Figure 4 14 1 LLDP Configuration Page Screenshot ...
Page 350: ...350 Figure 4 14 2 LLDP MED Configuration Page Screenshot ...
Page 372: ...372 Figure 4 16 1 Loop Protection Configuration Page Screenshot ...