Using the BayStack 350 Series 10/100 Autosense Switch
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Autosensing
BayStack 350 switches are autosensing and autonegotiating devices. The term
autosense refers to a port’s ability to sense the speed of an attached device. The
term autonegotiation refers to a standardized protocol (IEEE 802.3u) that exists
between two IEEE 802.3u-capable devices. Autonegotiation allows the BayStack
350 switch to select the best of both speed and duplex modes.
Autosensing is used when the attached device is not capable of autonegotiation or
is using a form of autonegotiation that is not compatible with the IEEE 802.3u
autonegotiation standard. In this case, because it is not possible to sense the
duplex mode of the attached device, the BayStack 350 switch reverts to
half-duplex mode.
When autonegotiation-capable devices are attached to the BayStack 350 switch,
the switch ports negotiate down from 100 Mb/s speed and full-duplex mode until a
supported speed and duplex mode is acknowledged by the attached device.
For more information about autosensing and autonegotiation modes, see
“Autonegotiation Modes” on page 4-5.
MultiLink Trunking
The MultiLink Trunking feature allows a user to group multiple ports (up to four)
together when forming a link to another switch or server, thus increasing
aggregate throughput of the interconnection between two devices, up to 800 Mb/s
in full-duplex mode. BayStack 350 switches can be configured with up to eight
MultiLink Trunks.
The switch supports a load balancing function that allows the switch to spread
traffic evenly across trunk members (ports that comprise a trunk), whenever
possible, to achieve the highest aggregate throughput. In addition, the MultiLink
Trunking software can detect misconfigured (or broken) trunk links. If this
happens, the software redirects all traffic on the misconfigured or broken trunk
member to other trunk members within that trunk.
The trunk members form a physical collection of ports that are treated as a single
logical link of higher bandwidth by the spanning tree protocol (STP) and the
learning, forwarding, and filtering functions.
For more information about the MultiLink Trunking feature, see “MultiLink
Trunks” on page 1-24.
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