3Com 3C17300A Implementation Guide - Page 17

Auto-negotiation, Your Switch supports the IEEE 802.3ad Link Aggregation Control Protocol

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Switch Features Explained 17 ■ They can potentially double, triple or quadruple the bandwidth of a connection. ■ They can provide redundancy - if one link is broken, the traffic load can be shared amongst the remaining link(s). Your Switch supports the IEEE 802.3ad Link Aggregation Control Protocol (LACP). This provides automatic, point-to-point redundancy between two devices (switch-to-switch or switch-to-server) that have full duplex connections operating at the same speed. For more information about aggregated links, see Chapter 2 "Optimizing Bandwidth". Auto-negotiation Auto-negotiation allows ports to auto-negotiate port speed, duplex-mode (only at 10 Mbps and 100 Mbps) and flow control. When auto-negotiation is enabled (default), a port "advertises" its maximum capabilities - these capabilities are by default the parameters that provide the highest performance supported by the port. For details of the auto-negotiation features supported by your Switch, please refer to the Management Quick Reference Guide supplied in PDF format on the CD-ROM that accompanies your Switch. Ports operating at 1000 Mbps only support full duplex mode. Duplex Full duplex mode allows packets to be transmitted and received simultaneously and, in effect, doubles the potential throughput of a link. Flow Control All Switch ports support flow control, which is a mechanism that minimizes packet loss during periods of congestion on the network. Flow control is supported on ports operating in half duplex mode, and is implemented using the IEEE 802.3x standard on ports operating in full duplex mode. Smart Auto-sensing Smart auto-sensing allows auto-negotiating multi-speed ports, such as 10/100 Mbps or 10/100/1000 Mbps, to monitor and detect high error rates, or problems in the "physical" interconnection to another port. The

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Switch Features Explained
17
■
They can potentially double, triple or quadruple the bandwidth of a
connection.
■
They can provide redundancy — if one link is broken, the traffic load
can be shared amongst the remaining link(s).
Your Switch supports the IEEE 802.3ad Link Aggregation Control Protocol
(LACP). This provides automatic, point-to-point redundancy between two
devices (switch-to-switch or switch-to-server) that have full duplex
connections operating at the same speed.
For more information about aggregated links, see
Chapter 2
“Optimizing Bandwidth”
.
Auto-negotiation
Auto-negotiation allows ports to auto-negotiate port speed,
duplex-mode (only at 10 Mbps and 100 Mbps) and flow control. When
auto-negotiation is enabled (default), a port “advertises” its maximum
capabilities — these capabilities are by default the parameters that
provide the highest performance supported by the port.
For details of the auto-negotiation features supported by your Switch,
please refer to the Management Quick Reference Guide supplied in PDF
format on the CD-ROM that accompanies your Switch.
Ports operating at 1000 Mbps only support full duplex mode.
Duplex
Full duplex mode allows packets to be transmitted and received
simultaneously and, in effect, doubles the potential throughput of a link.
Flow Control
All Switch ports support flow control, which is a mechanism that
minimizes packet loss during periods of congestion on the network.
Flow control is supported on ports operating in half duplex mode, and is
implemented using the IEEE 802.3x standard on ports operating in full
duplex mode.
Smart Auto-sensing
Smart auto-sensing allows auto-negotiating multi-speed ports, such as
10/100 Mbps or 10/100/1000 Mbps, to monitor and detect high error
rates, or problems in the “physical” interconnection to another port. The