R0106-HP MSR Router Series Interface Configuration Guide(V7)
8
Configuration procedure
To configure dampening on an Ethernet interface:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter Ethernet interface
view.
interface interface-type
interface-number
N/A
3. Enable dampening on
the interface.
dampening [ half-life reuse
suppress max-suppress-time ]
By default, interface dampening is
disabled on Ethernet interfaces.
Performing a loopback test on an Ethernet interface
If an Ethernet interface does not work correctly, you can perform a loopback test on it to identify the
problem. An Ethernet interface in a loopback test does not forward data traffic.
Only internal loopback tests are supported. In an internal loopback test, all on-chip functions related to
the Ethernet interface are tested.
Configuration restrictions and guidelines
• On an administratively shut down Ethernet interface (displayed as in ADM or Administratively
DOWN state), you cannot perform an internal loopback test.
• The speed, duplex, mdix-mode, and shutdown commands are not available during a loopback
test.
• During a loopback test, the Ethernet interface operates in full duplex mode. When a loopback test
is complete, the port returns to its duplex setting.
Configuration procedure
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter Ethernet interface view.
interface interface-type
interface-number
N/A
3. Perform a loopback test.
loopback internal
By default, no loopback test is
performed.
Configuring generic flow control on an Ethernet interface
To avoid packet drops on a link, you can enable generic flow control at both ends of the link. When
traffic congestion occurs at the receiving end, the receiving end sends a flow control (Pause) frame to ask
the sending end to suspend sending packets.
• With TxRx mode generic flow control enabled, an interface can both send and receive flow control
frames. When congestion occurs, the interface sends a flow control frame to its peer. When the
interface receives a flow control frame from the peer, it suspends sending packets.
• With Rx flow mode generic control enabled, an interface can receive flow control frames, but it
cannot send flow control frames. When the interface receives a flow control frame from its peer, it