3Com Switch 4800G 24-Port Configuration Manual - page 23
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If auto upgrade of boot file is enabled, as soon as a device is added into an IRF virtual device, the
IRF virtual device compares its software version with that of the master. If the versions are not
consistent, the device automatically downloads the boot file from the master, reboots with the new
boot file, and joins the IRF virtual device again. If the downloaded boot file and the local boot file
have duplicate file names, the local file is overwritten.
Follow these steps to enable auto upgrade of boot files for an IRF virtual device:
To do…
Use the command…
Remarks
Enter system view
system-view —
Enable auto upgrade of boot files
for an IRF virtual device
irf auto-update enable
Optional
Enabled by default
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Although IRF supports the auto upgrade of boot files, to shorten the time for IRF virtual device
establishment and reduce the influences caused by the IRF virtual device establishment to the
network, you are recommended to ensure that the device and the master have the same software
version before adding a device into an IRF virtual device.
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After automatically loading the master’s boot file, a slave configures the file as the boot file to be
used at the next boot and reboots automatically.
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To make the auto upgrade succeed, ensure that there is enough space on the storage media of the
slave.
Setting the Delay Time for the Link Layer to Report a Link-Down Event
After you set the delay time for the link layer to report a link-down event:
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If the IRF link state changes from up to down, the port does not immediately report the link state
changes to the IRF virtual device. If the IRF link state is still down when the configured time is
reached, the port reports the link state changes to the IRF virtual device, which then handles the
problem accordingly.
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If the link state changes from down to up, the link layer immediately reports the event to the IRF
virtual device .
Use this function to avoid unnecessary IRF virtual device partition and merge caused by frequent link
state changes of a port in a short time.
Follow these steps to set the delay time for the link layer to report a link-down event of an IRF virtual
device:
To do…
Use the command…
Remarks
Enter system view
system-view —
Set the delay time for the link
layer to report a link-down event
of an IRF virtual device
irf link-delay interval
Optional
The function is disabled by
default.