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Chapter 5: Switch operation
transmission. Therefore, no erroneous packets will occur, making it the best choice
when a network needs efficiency and stability.
The switch scans the destination address from the packet header and searches the
routing table provided for the incoming port and forwards the packet 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 existing hubs, which nearly always improves the overall
performance. Ethernet switching can be easily configured in any Ethernet network
environment to significantly boost bandwidth using conventional cabling and adapters.
Owing to the learning function of the 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 reduces the overall load on the network.
The switch performs Store-and-Forward, preventing errorneous packets and reducing
the re-transmission rate. No packet loss will occur.
Auto-negotiation
The STP ports on the managed switch have built-in auto-negotiation. This technology
automatically sets the best possible bandwidth when a connection is established with
another network device (usually at Power On or Reset). This is done by detecting the
modes and speeds of both devices that are connected. Both the 10BASE-T and
100BASE-TX devices can connect with the port in either half- or full-duplex mode.
If attached device is:
10 Mbps, no auto-negotiation
10 Mbps, with auto-negotiation
100 Mbps, no auto-negotiation
100 Mbps, with auto-negotiation
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100BASE-TX port will set to:
10 Mbps.
10/20 Mbps (10BASE-T/Full-Duplex)
100 Mbps
100/200 Mbps (100BASE-TX/Full-Duplex)
ES2402-24P-2C / ES2402-16P-2C / ES2402-8P-2C User Manual
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