Command Manual – Port Basic Configuration
Quidway S3900 Series Ethernet Switches-Release 1510
Chapter 1 Port Basic Configuration
Commands
Huawei Technologies Proprietary
1-18
Use the undo jumboframe enable command to allow frames that are not larger than
1536 bytes to pass through the current Ethernet port.
By default, frames that are not larger than 9216 bytes are allowed to pass through the
Ethernet port.
Example
# Allow frames that are not larger than 9216 bytes to pass through
GigabitEthernet1/0/1.
<Quidway> system-view
System View: return to User View with Ctrl+Z.
[Quidway] interface ethernet 1/0/1
[Quidway-Ethernet1/0/1] jumboframe enable
1.1.17 loopback
Syntax
loopback { external | internal }
View
Ethernet port view
Parameter
external: Performs external loop test. In the external loop test, self-loop headers
(which are made from four cores of the 8-core cables) must be used on the port of the
switch. The external loop test can locate the hardware failures on the port.
internal: Performs internal loop test. In the internal loop test, self loop is established in
the switching chip to locate the chip failure which is related to the port.
Description
Use the loopback command to perform a loopback test on the current Ethernet port to
check whether the Ethernet port works normally. The loopback test terminates
automatically after running for a specific period.
By default, no loopback test is performed on the Ethernet port.
Example
# Perform an internal loop test on Ethernet1/0/1.
<Quidway> system-view
System View: return to User View with Ctrl+Z.
[Quidway] interface ethernet 1/0/1
[Quidway-Ethernet1/0/1] loopback internal
Loopback internal succeeded.
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