Configuring The Suppression Time Of Physical-Link-State Change On An Ethernet Port; Configuring Loopback Testing On An Ethernet Port - 3Com 4500G Family Configuration Manual

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Follow these steps to enable flow control on an Ethernet port:
To do...
Enter system view
Enter Ethernet port view
Enable flow control
Configuring the Suppression Time of Physical-Link-State Change on an Ethernet
Port
An Ethernet port operates in one of the two physical link states: up or down. During the suppression
time, physical-link-state changes will not be propagated to the system. Only after the suppression time
has elapsed will the system be notified of the physical-link-state changes by the physical layer. This
functionality reduces the extra overhead occurred due to frequent physical-link-state changes within a
short period of time.
Follow these steps to configure the suppression time of physical-link-state changes on an Ethernet port:
To do...
Enter system view
Enter Ethernet port view
Configure the up/down
suppression time of
physical-link-state changes

Configuring Loopback Testing on an Ethernet Port

You can enable loopback testing to check whether the Ethernet port functions properly. Note that no
data packets can be forwarded during the testing. Loopback testing falls into the following two
categories:
Internal loopback testing, which is performed within switching chips to test the functions related to
the Ethernet ports.
External loopback testing, which is used to test the hardware functions of an Ethernet port. To
perform external loopback testing on an Ethernet port, you need to install a loopback plug on the
Ethernet port. In this case, packets sent from the port are received by the same port.
Follow these steps to enable Ethernet port loopback testing:
To do...
Enter system view
Enter Ethernet port view
Use the command...
system-view
interface interface-type
interface-number
flow-control
Use the command...
system-view
interface interface-type
interface-number
link-delay delay-time
Use the command...
system-view
interface interface-type
interface-number
1-4
Remarks
Required
Disabled by default
Remarks
Required
By default, the physical-link-state
change suppression time is not
configured.
Remarks

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