3Com S7906E - Switch, Руководство по настройке

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As for the internal loopback test and external loopback test, if a port is down, only the former is
available on it; if the port is shut down, both are unavailable.
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The speed , duplex , mdi , and shutdown commands are not applicable during loopback testing.
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With the loopback testing enabled, the Ethernet port operates in full duplex mode. With the
loopback testing disabled, the original configurations will be restored.
Configuring a Port Group
The devices allow you to configure some functions on multiple ports at a time by assigning the ports to
a port group in addition to configuring them on a per-port basis. This is helpful when you have to
configure a feature in the same way on multiple ports.
A port group is created manually and the settings you made on it apply to all group member ports. Note
that even though the settings are made on the port group, they are saved on a port basis rather than on
a port group basis. Thus, you can only view the settings in the view of each port with the display
current-configuration command or the display this command.
Follow these steps to configure a manual port group:
To do… Use the command… Remarks
Enter system view system-view —
Create a manual port group
and enter manual port group
view
port-group manual
port-group-name
Required
Add Ethernet ports to the
manual port group
group-member interface-list Required
Configuring an Auto-negotiation Transmission Rate
Usually, the transmission rate on an Ethernet port is determined through negotiation with the peer end,
which can be any rate within the capacity range. With auto-negotiation rate configured, you can enable
the Ethernet port to negotiate only part of the transmission rates within its capacity.