F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Command Reference-6PW100

19
Hardware Command com
p
atible
U200-A No
U200-S No
Examples
# Enable jumbo frames to pass through Ethernet interface GigabitEthernet 0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 0/1
[Sysname-GigabitEthernet0/1] jumboframe enable
loopback
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 Ethernet interfaces.
Views
Layer 3 Ethernet interface view
Default command level
2: System level
Parameters
external: Enables external loopback testing for all on-chip functions related to Ethernet interfaces.
internal: Enables internal loopback testing for the hardware of Ethernet interfaces.
Usage guidelines
Enable loopback testing for troubleshooting purposes, such as identifying an Ethernet problem.
You cannot perform internal or external loopback testing on an administratively down (ADM DOWN)
port. On a physically down (DOWN) port, you can perform only internal loopback testing.
During loopback testing, the speed, duplex, mdi, and shutdown commands are not available. In
addition, the port is operating in full duplex mode, regardless of its duplex configuration. After loopback
testing is disabled, the duplex configuration of the port is restored.
Examples
# Enable internal loopback testing on GigabitEthernet 0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 0/1
[Sysname-GigabitEthernet0/1] loopback internal