
54
Chapter 1 About Ethernet Switches 325 and 425
320985-A Rev 01
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
). An in-band connection between the switch and the TFTP load host
is required to download the software image.
Autosensing, and autonegotiation
The Ethernet Switch 325/425 is an autosensing and autonegotiating device:
•
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.
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 405
RFCs
For more information about networking concepts, protocols, and topologies,
consult the following RFCs:
•
RFC 1213 (MIB-II)
•
RFC 1493 (Bridge MIB)
Summary of Contents for 425-24T
Page 20: ...20 Contents 320985 A Rev 01 ...
Page 38: ...38 Preface 320985 A Rev 01 ...
Page 198: ...198 Chapter 4 Getting Started with Device Manager 320985 A Rev 01 ...
Page 212: ...212 Chapter 5 Using the Web based management interface 320985 A Rev 01 ...
Page 318: ...318 Chapter 7 System configuration using the CLI 320985 A Rev 01 ...
Page 336: ...336 Chapter 8 Ethernet port management using the CLI 320985 A Rev 01 ...
Page 384: ...384 Chapter 11 Administering the switch using Web based management 320985 A Rev 01 ...
Page 404: ...404 Chapter 12 Configuring the switch using Web based management 320985 A Rev 01 ...
Page 424: ...424 Installing an SFP Transceiver 320985 A Rev 01 ...
Page 442: ...442 Default settings 320985 A Rev 01 ...
Page 468: ...468 Command List 320985 A Rev 01 ...
Page 474: ...474 Technical specifications 320985 A Rev 01 ...
Page 488: ...488 Index 320985 A Rev 01 ...