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Use loopback to enable loopback testing on an Ethernet interface.
Use
undo loopback to disable loopback testing on an Ethernet interface.
Syntax
loopback { external | internal }
undo loopback
Default
Loopback testing is disabled on an Ethernet interface.
Views
Ethernet interface view
Predefined user roles
network-admin
Parameters
external: Enables external loopback testing on the Ethernet interface.
internal
: Enables internal loopback testing on the Ethernet interface.
Usage guidelines
After you enable loopback testing on an Ethernet interface, the Ethernet interface switches to full
duplex mode. After you disable loopback testing, the Ethernet interface restores to its duplex setting.
An Ethernet interface in a loopback test cannot correctly forward data packets.
You cannot perform a loopback test on Ethernet interfaces manually brought down (displayed as in
ADM or Administratively DOWN state).
The
speed, duplex, mdix-mode, and shutdown commands cannot be configured on an
Ethernet interface in a loopback test.
Examples
# Enable internal loopback testing on GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] loopback internal
multicast-suppression
Use multicast-suppression to enable multicast storm suppression and set the multicast
storm suppression threshold.
Use
undo multicast-suppression to disable multicast storm suppression.
Syntax
multicast-suppression { ratio | pps max-pps | kbps max-kbps } [ unknown ]
undo multicast-suppression
Default
Ethernet interfaces do not suppress multicast traffic.
Views
Ethernet interface view
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