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Chapter 1 About Ethernet Switches 325 and 425
Flash memory storage
Switch software image storage
The Ethernet Switch 325/425 uses flash memory to store the switch software
image. The flash memory allows you to update the software image with a newer
version without changing the switch hardware (see
on page
is required to download the software image.
Autosensing, and autonegotiation
The Ethernet Switch 325/425 is an autosensing and autonegotiating device:
•
•
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
standard. In this case, since it is not possible to sense the duplex mode of the
attached device, the Ethernet Switch 325/425 reverts to half-duplex mode.
When autonegotiation-capable devices are attached to the Ethernet Switch 325/
425, the ports negotiate down from 100 Mb/s speed and full-duplex mode until the
attached device acknowledges a supported speed and duplex mode.
For more information about autosensing and autonegotiation modes, see
Chapter 13, "Troubleshooting," on page
RFCs
For more information about networking concepts, protocols, and topologies,
consult the following RFCs:
•
•
320985-A Rev 01
237). An in-band connection between the switch and the TFTP load host
The term autosense refers to the ability of a port 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
switch to select the best of speed and duplex modes.
RFC 1213 (MIB-II)
RFC 1493 (Bridge MIB)
"Software Download screen"
405.
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