Advanced Reference Guide
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Fast SwitcHub-8mi SNMP
Parameter
Description
(continued)
Max. Message Age
The maximum time (in seconds) a device can wait without receiving a
configuration message before attempting to reconfigure.
Root
The priority and MAC address of the device in the spanning tree that this switch
has accepted as the root device.
Root Cost
The path cost from the root port on this switch to the root device.
Topology Change Count The number of times a switch port has entered the forwarding state, plus the
number of times a port has changed from forwarding to blocking. This counter
is reset when the switch is reset or the spanning tree is turned on.
Time Since Last Topology The time since a switch port last entered the forwarding state, or made a
transition Change from forwarding to blocking.
Port
The port number on the switch.
State
Displays the current state of this port within the spanning tree:
Disabled
Port has been disabled by the user or has failed diagnostics.
Blocked
Port receives STA configuration messages, but does not forward
packets.
Listening
Port will leave blocking state due to topology change, starts
transmitting configuration messages, but does not yet forward
packets.
Learning
Has transmitted configuration messages for an interval set by the
Forward Delay parameter without receiving contradictory
information. Port address table is cleared, and the port begins
learning addresses.
Forwarding The port forwards packets, and continues learning addresses.
The rules defining port status are:
A port on a network segment with no other STA compliant bridging device is
always forwarding.
If two ports of a switch are connected to the same segment and there is no
other STA device attached to this segment, the port with the smaller ID
forwards packets and the other is blocked.
All ports are blocked when the switch is booted, then some of them change
state to listening, to learning, and then to forwarding.
Designated Cost
The cost for a packet to travel from this port to the root in the current spanning
tree configuration. The slower the media, the higher the cost.
Designated Bridge ID
The priority and MAC address of the device through which this port must
communicate to reach the root of the spanning tree.
Designated Port
The port on the designated bridging device through which this switch must
communicate with the root of the spanning tree.
Downloading System Software
Using TFTP Protocol to Download over the Network
Use the TFTP Download screen under the Download & Reset menu to load software
updates into the switch. The download file should be an ES3508 *.bin file from Accton;
otherwise the agent will not accept it. The success of the download operation depends on
the accessibility of the TFTP server and the quality of the network connection. After
downloading the new software, the agent will automatically restart itself. The parameters
shown in this screen are indicated in the following figure and table.
TFTP Download
TFTP Server Address 192.72.24.17
Download Filename es3508.bin
Execute Network Download
Return to Previous Menu
Return to Main Menu
Use cursor keys to choose item. Press <ENTER> to confirm choice.
Press <CTRL><N> to return to the Main Menu
Parameter
Description
TFTP Server Address
IP address of a TFTP server.
Download Filename
The *.bin file to download.
Execute Network Download Issues request to TFTP server to download the specified file.
Using the Serial Port to Download Out-of-Band
Use the Serial Download command under the Download & Reset menu to update available
software in the switch. The download file should be an ES3508 *.bin file from Accton;
otherwise the agent will not accept it.
This command specifies direct download from an attached device via the serial port. You
may download using any terminal emulation program that can transmit binary files using
Xmodem protocol. Position the highlight cursor over "Serial Download" and press the
<Enter> key. After selecting a file and the Xmodem protocol, initiate sending the file from
your computer by specifying "send" or "upload" file. The terminal emulation program will
display the progress of the download process. After downloading the new software, the
agent will automatically restart itself.
Resetting the System
Use the Reset command under the Download & Reset menu to reset the system or clear the
address table. The information and reset options listed on this screen are detailed in the
following figure and table.
Reset
Display Diagnostics While Power-On Yes
Reset Unit with Diagnostics
Reset Unit without Diagnostics
Clear Address Table
Reset EEprom to Factory Default Value
Return to Previous Menu
Return to Main Menu
Use cursor keys to choose item. Press <ENTER> to confirm choice.
Press <CTRL><N> to return to the Main Menu
