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Chapter 7: Switch Operation
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, 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 Ethernet 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. However, 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 significantly
boost bandwidth using conventional cabling and adapters.
Due to the learning function of the Ethernet switching, 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.
The Switch performs "Store and forward" therefore, no error packets occur.
More reliably, it reduces the re-transmission rate. No packet loss will occur.
Auto-Negotiation
The STP ports on the 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
detect the modes and speeds at the second of both device is connected and
capable of, both 10Base-T and 100Base-TX devices can connect with the port in
either Half- or Full-Duplex mode.
If attached device is:
10Mbps, no auto-negotiation
10Mbps, with auto-negotiation
100Mbps, no auto-negotiation
100Mbps, with auto-negotiation
200
100Base-TX port will set to:
10Mbps.
10/20Mbps (10Base-T/Full-Duplex)
100Mbps
100/200Mbps (100Base-TX/Full-Duplex)
GE-DS-242-PoE Managed Ethernet Switch User Manual
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